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User's manual for the software SILDIS (*)

1. Item Foreseen action Input comment Size of the baffle in which the partition is symmetrically T i mounted along the x Input a positive real 4 5 direction Size of the baffle in which the partition is symmetrically T x mounted along the z Input a positive real 3 5 direction Size of the partition along m X the x directi Input a positive real 1 Size of the partition along E es dance Input a positive real 1 Model for the calculation of Select a model in the 3 fll proposed list ees Select a value in the Fi min proposed list 5 625 Select a value in the Fi max proposed list 84 375 a Select a value in the Teta min proposed list 0 30 T Select a value in the Teta max proposed list 89 375 30 Model for teta L Select a model in the 90 29 proposed list length of slit m Input a positive real 1E 50 31 width of slit m Input a positive real 1E 50 31 model Select a model in the proposed list 31 Worksheet in out COPPA0 for example 2 4 2 No input data required for the example of computation Worksheet in out COPPA1 for example 2 4 2 No input data required for the example of computation Worksheet in out COPPA2 for example 2 4 2 See placemark Item Foreseen action Input comment A Select a model in the general model for Rdif proposed
2. 168 Step AB break out sound power level see 168 3 2 2 1 b Acoustics rectangular ducts break in noise ssssesseeeenen e 169 Bloc diagram for rectangular duct walls break in noise 169 Steps of the computation for rectangular duct walls break in no se 169 Ss aEWVOAAEETECETSUT M 169 Preliminary remarks common to step AC and step AC ss 170 Step AC sound reduction index of a single leaf rectangular duct eene 170 Step AC sound reduction index of a single leaf rectangular duct sese 170 Step AE insertion loss of set 1 when compared to set 0 170 Step AF transmission loss with sound leaks 171 Step AG break in sound power level nnne nennen nene nemen nennen nee 171 3 2 2 2 Acoustics circular ducts 11 25 5454 dinde sanctionner EA e e RE HN E URN ER ERRR CE eM DR Re 171 3 2 2 2 a Acoustics circular ducts break out noise 171 Bloc diagram for circular duct walls break out noise 171 Steps of the computation for circular duct walls break out no se 172 Steps TA TO VI ESS EUER NIME IERI 172 Preliminary remarks common to step AH and step A
3. Fig IDS 3 gt in out CODIS1 gt in out CODIS2 gt in COALA gt Icom gt in out CORESPTR gt gt in out CORESPTL gt peer page 1 in COALA gt in out COSTDU gt in in out gt in COALA i COBEND in COALA gt gt in out CONOZ gt Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Page 242 262 Note temperature and pressure conditions as well as reference spectrum one should enter in worksheet in COALA Worksheet Suitable for mountings Input data Results in COALA all for sets for reference spectrum particular conditions for the design of in CODIS all the silencer in out CODIS1 R R C1 C2 in out CODIS2 Q CO E i indicators of performance acoustics condition of propagation of sound in out CORESPTL RPTR RPTR amp Aerodynamics in out CORESPTR RPTL RPTL in out COSTDU all for duct dimensions flow rate in out COBEND all for bend dimensions flow rate indicators of performance acoustics in out CONOZ all for duct dimensions indicators of performance acoustics Input
4. Y an added length increasing the mass of the vibrating air in the neck depending on the geometry of the perforation Model of added length according the COA COB COC COJ COM CHC CHM CAR FEM FED ZER perforation geometry source D3 D2 D6 D9 D7 D6 D7 D7 D7 D8 Geometry of the circular M das circular square array square infinite slot perforation hexagonal array no Open area ratio lt 0 16 s bd 0 16 added length Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 41 262 Y the following models of added impedance Model of added RDE ROA ZER impedance source D5 D7 without additional with additional x interaction em no interaction resistance effects resistance effects the model ZER applies notably for modeling a front added length blown away by an airflow using electro acoustic analogies complementary impedances can be accounted for some predictions to be done in relation with the COmputation of Acoustic LAyers with respect to the base impedance Zbase see fig 1 9 a series resistance R Nsm 3 for models MOI and ICH a parallel reactance jM o N
5. Item Cell d Foreseen action Input See placemat k input comment Temperature 6 Input a real number 20 1 Pressure D7 Inputa real positive 100000 2 number Select a reference Reference w31 material in the proposed STEEL 3 list Select 1 or 2 in the 8 a proposed list Model of effective critical W37 Select model in the NAT 4 frequency proposed list Thickness W38 PENSE 0 010 5 number Worksheet in out COCID IN gt OUT Item Cell d Foreseen action Input See placemark input Diameter D AH49 Input a positive real 0 3 6 Length L AHSI Input a positive real Mass flow rate AH53 Input a positive real Model of cut off frequency AH64 Select a model in the fco les proposed list Model of mounting R85 Select a model in the c 8 proposed list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 186 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COALA m Orp ED i LLL or g f te pre d Aay Moget Lii M eque Vent wrat boh anle Pepe a ind debut cer t UI 9 on dete Ra m comte prre iwi m port LL e Coque omm onem n sms D
6. Report Date Page PhR15 008A 01 04 2015 234 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COALA ae oo ww e rnm jtm rw qw cu e C ww acp 3 s 5 1 amp p ou U cong et of tere AD 70 Compare n Tupan laneo ite Congos amp f KL sp Seat n Pon Thee ap h Um ied acd xal Cel 1o tla Esaias wb 7 ras ve an dt www vina re Wien data mum Ld er Doucet cere ihre s cmm emm om end Soy arem RUM ma m i e me mE te ntm S rig im geh on ooh E negli ETC x Cantus of Pam PA Pm r D T PE CD gate at thada Dicis hat L m E A r se Te S E A ee ee es ee ee Compe rmn of E ne ph Ter hent n ttes ioe m L pcs of ered nn man tne eee tere Lm si SE we we mwe sm me ume cm oT se ee VM LL AM Me ug 1 liet Le eee N pon tie LI ww II I ae ae I ae ee 2 I ee eee ANT Dm Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 235 262 Screenshot of worksheet in out CONOZ ql Wa a WE ae i 1 jus ms REC nD a Nt 1 1 1 1A 13 EEE ER NC EC
7. caben tate semen les CHET YO CORE HT TOI CHIL mh Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 216 262 Screenshot of worksheet in out COCID IN gt OUT Pane nena mm enr mt miam e ee IM TOUTS gt AZ Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 217 262 Screenshot of worksheet in out COBON Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 218 262 Appendix to Section 5 list of symbols General Cf corresponding in Section 1 2 3 and 4 Lw0 sound power level without soundproofing equipment dB ref 1pW i e in the entrance plane of the duct casing section of interest Lwl sound power level with soundproofing equipment dB ref 1pW i e
8. for the genera models SHA1 SHA2 SHA3 only a model for connections as shown in the tables below model L L L P P P rs R1 R1 R1 R1 R2 comment Line Line Line Point Point Point Note for the present revision of the software vibration transmission factor input data are not used for the computation to be continued work on progress o Remarks in relation with the angular integration in case of use of the model INT for plates of set 0 general models SHA1 and SHA 2 see corresponding at step P o Remarks in relation with the displayed results see corresponding at step P To be continued Step S This steps aims at calculating the sound reduction index of sound leaks o Bibliography references 51 S2 o Comments In order to include the calculations in the general layout of the program the following bibliographic source have not been used S3 slit shaped leaks are taken into account according various models as shown in the tables below model GOM UNI source S1 S2 9 the transmission factor is considered equal to unity To be continued Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www
9. AQ1 AQ2 o Comments the model for TL out is selected as shown in the table below model 2081 HAN Source ABI 3 3 How to use SILDIS AB2 Operating conditions security level safety See corresponding in the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for which input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used Worksheet Cells in COALA E13 J37 W38 in CODAP W23 in out COPPA X53 X54 Worksheets something like that attention has to be paid to the fact that the considered sheet is not included in the worksheets listed below Regarding the COmputation of Duct Walls the software SILDIS is configurated in order to allow the user to access to various worksheets being linked as shown in fig 3 5 the overview of the worksheets being shown in table below in out COORT in out CODAP in out COPERF jin COALA in out CORED IN gt OUT gt in out CORED OUT gt IN in out COCID IN gt OUT in out COCID OUT gt IN Fig 3 5 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31
10. o Comments Step AY This step aims at calculating the insertion loss of the bend including its self noise o Bibliography references the self noise is computed according to various models as shown in the table below model HAN 2081 SMA Source AXI AX3 AX4 AY1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date PhR15 008A 01 04 2015 o Comments Page 223 262 The sound power level downstream of the bend including self noise Lw1 in dB ref 1E 12W is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Lwl 10 log 10 0 1 Lw0 Di 10 0 1 Lw Lw being the self noise acoustic power of flow noise in dB ref 1E 12W The insertion loss taking into account the self noise Di in dB is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Di Lw0 Lw1 In case of rectangular ducts the obtained results are comparable with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss
11. Item Cell for Foreseen action Input See placemark input comment Select a reference of material in the proposed Reference list for each layer of STREL FE interest Open area ratio Input a real positive 0 03265 42 number Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 151 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COPERF for example 2 4 3 eee uw m D Dorr CT m o T ture XM be CODI COREIPT E Example 2 4 4 plate with an extensional damping Envisaged application It is foreseen to compute the engineering constants for a damped plate consisting of aluminum plate 43 of thickness 2mm 44 viscoelastic plate reference VSCO in the database 45 of thickness 2mm 46 The model of composite MOI is considered 47 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in out CODAP for example 2 4 4 Item Cell tor Fores
12. propagation loss Da 35 e without with 30 25 20 oo E 15 2 8 5 10 E nd t 9 5 NL v ne d ul 0 qo 1 10 100 1000 10000 100000 f Hz fi 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k without 0 5 08 1 1 16 21 26 32 38 43 49 55 63 73 86 102 124 154 195 247 299 250 132 7 1 39 23 13 08 05 03 02 with 05 08 12 16 21 27 32 38 43 49 55 63 73 86 103 125 153 190 23 1 250 194 115 65 38 22 14 08 05 03 02 Comment the choice of a perforated protection influences sometimes considerably the acoustic performance of the silencer at least for some frequencies For a given geometry of holes and a given thickness a decrease of the open area ratio involves generally speaking a decrease of the performance In particular the choice of a perforated protection with an open area ratio too small compared with the optimum required as far as acoustics is concerned can lead to a degradation of the performance for frequencies possibly within the range of interest in the area of the maximum propagation loss the performance is degraded in the example above despite a quite high open area ratio For a given perforated protection the performance can decrease notably in case of a non sufficiently pervious material at the rear see also the last paragraph of illustration 1 5 1 Isolation Technologie Services SARL au capital de 7000
13. 5 t as per BAI11 when one suppose a diffuse acoustic field this means that the dimensions of enclosed space are similar and that absorption is distributed in the whole space the existence of diffusing objects is moderating those limitations for the model KUT only the relative variance of the path length distribution Y depending on room dimensions ratio is accounted according to various models as shown in the table below Model ZER PAR TOT Source BAI BAI3 equation 13 equation 12 PARtial Comment Y ZERo power series TOTal exact approximatio formula n for the model KUT only the inhomogeneity non uniform placement of sound absorption is accounted according to various models as shown in the table below Model ZER PARI PAR2 TOT BAI AP BAI3 Source equation 2 equation 27 80 equation 25 PARtial power series ZERo approximatio ae TOTal exact Comment accounting consideration n amp not Sam formula TUM Zpi2Si2 accounting Zpi2Si2 for the model ARA only un cleared variations occur for modelling when accounting solid angles The obtained results are comparable with standardized measurement cf NF EN ISO 3382 2 Acoustics Measurement of room acoustics parameters Part 2 reverberation time in ordinary rooms 9 3 How to use SILDIS Operating conditions security level safety See corresponding i
14. M5 M6 M7 M8 M9 o Comments The following governing equation is considered with notations adapted from various sources will be specified on the occasion of a future revision of this user s manual p 2v amp XCDad DS Ow Dy OY aw LOW 2 x z t 11 E 12 66 OZ 22 ez t ae Pp amp Z where M surface density kg m2 p pressure Pa t time s w lateral transverse displacement m and where the bending stiffnesses Dij i and j varying from to 2 Nm can be expressed as Dii D x D 2 Di 2Des 2 D xz 22H 2D where D xz D x D Z2 D Dy D z D The loss factor of plates n is computed according various models as shown in the table below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 114 262 model INT TOT source n of He M5 material When used the frequency corresponding to the mode 1 1 of thin plates f may be displayed f11 is computed according various models as shown in the table below model HAN HEA source M4 M6 The critical frequency fc is derived as 2 M pe e J e 2n D The effective critical frequency fceff appl
15. Modification of the displayed date Input a string Input a string Input a real number common value applicable to the fluid to porous media to series cloths to perforated protection Input a real positive number common value applicable to the fluid to porous media erforated protection to series cloths to p Input an integer from 0 to 4 Select a material in the proposed list for each layer of interest Input a real positive number Select a reference of element material in the proposed list for each layer of interest For NO press 0 for YES press 1 Input a real positive number Select a reference of element material in the proposed list for each layer of interest For NO input 0 for YES input 1 Input a real positive number imax is the maximum set index taken into account for the computation despite the status of the selection of the parameters related to sets with an index i imax considered homogeneous for CODIS only a possible inhomogeneity in directions parallel to and perpendicular to its surface i e different properties depending on the used model in directions x and y is considered for the porous medium of set 1 porous media of sets 2 to 4 being taken into account for the computation as a non zero value only if 1 in cell just above taken into account for the computation as a non zero value onl
16. Only in case of circular cross section Item Cell for Foreseen action Comment diameter D m P47 Input a positive real Only in case of rectangular inlet cross section amp circular outlet cross section Item i tor Foreseen action Comment input biggest dimension al m H23 Input a positive real smallest dimension b1 m H24 Input a positive real diameter D m P47 Input a positive real o Main displays of the results Tables of results in case of rectangular inlet cross section amp rectangular outlet cross section insertion loss without self noise Di see lines 21 to 24 columns S to AD self noise Lw see lines 26 to 30 columns S to AD sound power level downstream of bend see lines 32 to 36 columns S to AD insertion loss with self noise Di see lines 38 to 41 columns S to AD Tables of results in case of circular cross section g insertion loss without self noise Di see lines 44 to 47 columns S to AD self noise Lw see lines 49 to 53 columns S to AD sound power level downstream of bend see lines 55 to 59 columns S to AD insertion loss with self noise Di see lines 61 to 64 columns S to AD Tables of results in case of rectangular inlet cross section amp circular outlet cross section insertion loss without self noise Di see lines 67 to 70 columns S to AD self noise Lw see lines 72 to 76 columns S to AD sound power
17. d 2d 2 thickness of extreme inner lagging for mountings R C1 C2 only thickness of lining for mounting Q CO only 2d thickness of central splitters for mountings R R diameter of central pod for mountings C1 C2 only thickness of intermediate splitter for mounting C2 only h 2h 2 width of extreme air way for mounting R only 2h width of central airways for mounting R R only width of the airways for mountings R R CI C2 Q a h 2 z 2a width of airway for mounting CO only L length of the silencer without aerodynamic extremities N number of central splitters for mounting R only N B 2 d h N number of central splitters for mounting R only N N 1 Concerning the area of the duct upstream and downstream above and below the silencer A compared to the area of the overall section of the silencer Af predictions with the software SILDIS can be done for mountings R R C2 with A Af for mounting C1 with A Af or with A Af lt Af for mountings Q CO with A Af lt Af Section of the duct above and below the silencer A R R C1 C2 Q CO depending on mounting if A Af B H z D1 A m D2 4 QF z D0 4 if A Af lt Af z n D1 2d 4 m D2 2d 4 Q 2dy z D0 2d 4 2d being subtracted to the overall dimension of the silencer in order to obtain the corresponding dimension of the considered duct The direction pa
18. 03 1A 04 1A 05 1A 06 1A 07 1A a8 1A o taking into account the aerodynamics type upstream and downstream Comments The total pressure loss due to the silencer is computed with the hypothesis of a uniform air flow supposed to not be rotational Aerodynamics type downstream R C mounting RD Rectangular 1 2 Circle 1 2 Circle for central splitters 1 4 Circle for extreme inner lagging 1 4 Circle for extreme inner lagging Aerodynamics type downstream C P mounting RD lt Rectangular 1 2 Circle 1 2 Circle for central splitters 1 4 Circle for extreme inner lagging 1 4 Circle for extreme inner laggin see fig 1A 4 fisse Cim as lt Profiled according sketch the dotted line showing either a symmetry plane or an impervious rigid back Fig 1A 4 Y forthe mounting of the worksheet CODIS 1A RD the determination of the total pressure loss is done is done according various models as shown in the tables below Model FRO MEC 2081C1 BER ISO source a1 1A 02 1A 06 1A 03 1A Lae a7 1A In case of rectangular silencers the obtained results are comparable with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss leadin
19. Rectangular duct or silencer casing Circular duct or silencer casing for duct or silencer casing dimensions for some models longitudinal sound attenuation as well indicators of performance acoustics Input data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with o the input data See corresponding in the chapter General considerations o some alerts in case of input data involving a warning of the user o the place where and the way some results are presented Those key points are reviewed worksheet per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 213 262 Worksheet in out COBON o Input data Cell for Item input Foreseen action Comment Perimeter of the cross section iss of the silencer Gi R20 Input a positive real Area of the cross section of 7 l an the silencer m2 R22 Input a positive real Model for TL out R27 Select a model in the proposed list Model of
20. the use of this model is highly discouraged if the same choice of model is not made for forced transmission V forf x fc the transmission factor is derived for a frequency range chosen by the user in terms of a number of 1 3 of octave below fc according various models as shown in the table below model JOS NF NAT P 11 source P 12 P 3 the transmission factor is derived as for the general case f fc gt atand above the critical frequency fc Y for f sufficiently above fc the transmission factor t is derived according various models as shown in the table below model INT SEA CRE JOS NF NIL ome P S C P2 5 P 6 P11 P 3 uy see step M in case of a non pure thin plate see also steps M to M see remarks in relation with the direction of the waves impinging the partition below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Date 01 04 2015 Report PhR15 008A Page 125 262 Y forf x fc the transmission factor is derived for a frequency range chosen by the user in terms of a number of 1 3 of octave above fc according various models as shown in the table below model JOS NF ND NAT
21. No compulsory input data Input a positive real If a particular value of h d h resp d h d h local is wished then input the value given in G25 resp H25 J25 Input a positive real If a particular value of N is wished then input For the COmputation of REsonant Silencers with Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Mass flow rate Mounting R to get N Mounting CR to get Ncr Mounting RPT to get N Width B m Height H m Length L m Model of reflection loss Model of by pass correction Aerodynamics upstream Aerodynamics downstream The direction of flow is the direction of the foot of the pine tree when the branches shape of the splitters is considered 0 1 Roughness of lining A m Model of total pressure loss Model of total pressure loss For model NF2 only B dB For model NF2 only 8 m For all models 2081 3733 FRO only spectral correction model Model for the flow acoustic power o Comments Date Page 01 04 2015 56 262 the value given in AQ25 Pine Tree splitters only A positive value is related to a directio
22. No particular bibliography has been considered o Comments if IL stat is accounted TL out R dif IL stat else TL out R dif the model for Rdif is selected as shown in the table below model 1 2 source cf step X cf step X Step AB This step aims at calculating the break out sound power level with atmosphere at the front and at the rear regardless of the selected input data First approach o o Bibliography references ABI AB2 Comments the model for TL out is selected as shown in the table below model 2081 HAN ASH Source ABl AB2 AB2 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 169 262 the correction factor to account for gradually decreasing values of the sound power level inside the duct as the distance from the sound source increases only accounts the sound attenuation A dB m due to internal ductwork losses which is entered in worksheet in out CORED IN gt OUT Second approach o Bibliography references AB3 AB4 o Comments the model for TL out is selected as shown in the table below model 3733 MIX source AB3
23. P 11 n eu source P 12 P 3 P 15 CE to be used only with model NI2 for forced and resonant transmission and with model NIL for transmission above fc the transmission factor is derived as for the general case f 2 fc gt in order to retrieve some not always comprehensive presentations given in various bibliographic sources with the general model MOI source models P2 P 3 P 5 P 8 P 9 boundary conditions SSE CE SSE CE SSE CE radiation ratio of free MAI NF MAI 9 bending waves simplified transmission T ARE ix ES factor for normal incidence yes yes yes yes yes model of forced ZER NF INT SEW BAL transmission for f lt fc model of resonant SEA NF SEA SEA ZER transmission for f gt fc model of SEA NF INT SEA SEA CRE transmission source models P 10 P 11 P 13 P 14 P 15 boundary conditions SSE CE SSE CE SSE CE SSE CE radiation ratio of free A E bending waves l simplified transmission e5 noi s Es factor for normal incidence yes yes yes yes model of forced DAV JOS GER NII ND transmission for f fc model of resonant ZER JOS JOS NII ND transmission for f fc Es CRE JOS JOS NIL NIL transmission gt inorder to retrieve the results of step P with other appropriate input data source models step P boundary conditions radiati
24. Section 5 computation of break out noise MODULE 5 of the software 5 1 Introduction 77 1 osse tnter tnter n 209 Terms and definitions o terrere ne e HUE Ter awe E 209 Mountings and geometry se 209 5 2 Scientific and technical background sse 209 5 2 1 Thermodynamics and fluid dynamics seen 209 Steps of the computation eee nene nnne nennen nenne nenne nene en ense ense nennen 209 5 2 2 Y RE UU cUm 209 Bloc diagram DEMEURE Steps of the computation NI Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 12 262 Step AV breakout horse iscsi eis hee eae pid ena pM See DIR ee TM INE e aes 211 5 3 How to use SIDE beta 211 Operating conditions security level safety 211 Worksheets en HP I D ane toner tin one die es 212 Input data alerts and results the key points 212 5 4 Examples of computation with SILDIS sss 213 Example 5 4 1 circular duct wall spiral seam pipe sseeeeen enne 213 Envisaged application see
25. Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date PhR15 008A Page 01 04 2015 87 262 the coefficient of thermal expansion of dry air is referred to as B T a 2 VI oT p oT o Other comments when used the density of dry air pis computed according various models as shown in the table below model MAR MEC al 1A vnde quia RUN derived from Men a MARiottes s PBESSION law the gas constant of dry air R J kg K is set to 287 or 287 053 or 287 10 depending on the eponym selected model when used the dynamical viscosity of dry air n is computed according various models as shown in the table below model SUT VER MEC IDE a2 1A al 1A a2 1A source iei a4 1A using a using a SUTherland regression regression s law limiting 20 to 800 9 173 15 to 20 to 800 temperature C i 926 85 C C Conversion micropoise centipoise poise kg m s factors g cm s Nsm 2 micropoise 1 107 10 107 centipoise 10 I 10 10 poise 6 2 1 eus 10 10 1 10 kg m s 7 3 Nsm 2 10 10 10 1 when used the kinematic viscosity of dry air v is computed from al 1A Note v n p Conversion centistokes stokes m2 s factors mm2 s cm2 s centistokes 1 10 10 mm2
26. Tables of results for components sound pressure level at a specified distance Lpoutcalc see lines 56 to 68 columns S to AE Tables of results for full duct system G sound power level radiated by components walls Lwoutcalc see lines 28 to 32 columns S to AE Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 244 262 8 4 Examples of computation with SILDIS Example 8 4 1 cylindrical attenuator without core bend straight duct the acoustic performance of each component being predetermined Envisaged application It is wished to compute for room temperature 17 C 1 pressure 1E5 Pa 2 the acoustic performance of a duct system made of a cylindrical attenuator without core The insertion loss without flow noise Di is as shown in the table below 3 F Hz 63 125 250 500 1000 2000 4000 8000 Di dB 2 4 8 16 3l 22 12 11 The flow noise Lw is assumed to be negligible 4 Note the performance of this silencer may have been simulated with SILDIS If so performance would be displayed in worksheet referred to as in out CODIS2 a bend The insertion loss without flow noise Di is as shown in the table below 5 F Hz 63 1
27. Y contents of the library 21 possible references of material layers data base librar Y contents of the library 21 possible references of material layers for layers constituting the damped plates available in worksheet in CODAP for the base plate used for defining orthotropic plates available in worksheet in COORT Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 131 262 o some alerts in case of input data involving a warning of the user o the place where and the way some results are presented Those key points are reviewed worksheet per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in out COPERF o Input data Item Cell tor Foreseen action Comment input Modification of the Date es displayed date possible Input a name for the Project pa considered project Input a name for the Configuration 3 8 E considered configuration Comments T3 Input a comment Select a reference of material in the proposed Reference Es list for each layer of interest Open area ratio U22 Inputa reil pos
28. input Limit set index ilim Half airway h m Mass flow rate Width B m Height H m Length L m Model of reflection loss Model of by pass correction Aerodynamics upstream Aerodynamics downstream Roughness of lining A m Model of total pressure loss For model NF2 only B dB For model NF2 only 6 m For all models 2081 3733 FRO only spectral correction model Model for the flow acoustic power o Comments Foreseen action Comment Input an integer from 1 to imax imax amp lt ilim lt imax amp being the total number of cloths and perforated protections accounted as porous media Input a positive real Input a real A positive value is related to a direction of airflow equal to the direction of propagation of sound a negative value is related to a direction of airflow opposite to the direction of propagation of sound Input a positive real If a particular value of N resp N is wished then input the value given in O43 resp AQ43 If the extrapolation from mounting R to a particular mounting is wished then input the value given in R43 resp U43 AA43 Input a positive real If the extrapolation to a particular mounting is wished then input the value given in R44 resp U44 AAA Input a positive real Without aerodynamics extremities Select a model in the propose
29. omitted in the worksheets displays of the software for the sake of simplicity n number of identical thin plates of set i omitted in the worksheets displays of the software for the sake of simplicity For the total surface density of the acoustic structure d the following formula apply imax imax imax imax M Mi 4 Ti M D Ms ni M i 1 i 1 i 1 0 i Mi resp M M i and M surface density of the porous medium resp the series cloth the series perforated protection and the thin plate of set i Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 112 262 Ij resp Id 0 or 1 depending on the incorporation or not of the considered element of set i in the acoustic structure omitted in the worksheets displays of the software for the sake of simplicity nj number of identical thin plates of set i omitted in the worksheets displays of the software for the sake of simplicity set 4 set 3 set 2 set 1 set 0 LL MI I f Fig 2 4 DA atmospheric back or impervious rigid back each set from 1 to 4 consists from the rear to the front of up to 1 porous medium up to 1 series cloth and up to 1 series perforated protection up to 1 series t
30. scattering coefficient of surface y 0 resp y B 6 z 0 resp z H scattering coefficient of surface z 0 resp z H Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr
31. 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 5 262 Step L complementary step for resonant silencers with pine tree splitters 49 1 2 3 Aerodynamics ennnen i ie see esee ese tese rese te eeepc dese eee deer 50 Steps of the computation 5 ete ee o e te eben e atte ieitt 50 1 3 How to use SIEDIS uin RE Rer Ms RR ero erst do oett 51 Operating conditions security level safety 51 Worksheets P T MENTITUM 51 Input data alerts and results the key points 52 MMOVGITSSPIEOLUYNULN MRRRRRRRRRRRRRRRRRRRRRRREEMMMMMMMMMMMMMMMMMMMMMMMWMMMMMMMMMWMWMWMWMWMWMWMWMWMWMWMMMZAAK M 53 Worksheet uy COSILE 3 12 38 Be ret eA oe ter reete este TA eee 55 Worksheet in out CODISI in out CODIS2 in out CORESPTR in out CORESPTL 57 1 4 Examples of computation with SILDIS sss 58 Example 1 4 1 dissipative silencer with a rectangular cross section ssssssseee 58 Envisaged application 16 re oH RE EP TE ect 58 Input dat oon eit SR Re nn NE Ann tn NT II OD ete Oo erdt 58 Screenshots of the worksheets for the example of computation 61 Example 1 4 2a dissipative silencer with a square cross section sses 63 Envisaged applicati i 5 otim eire Ier tx PR T t HO ENDE
32. 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 T9 262 Effects of the velocity of air flow regenerated noise illustration 1 5 11 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters having no transverse solid partitions inhibiting the sound propagation along the duct axis inside the non laminated lining consisting of a single porous medium homogeneous in directions parallel to and perpendicular to its surface having at room temperature a flow resistivity in the direction normal to the axis of the duct oy1 15kNsm 4 a porosity g 0 95 model M76 with a thickness d 0 1m and a length L 2m No series cloth is considered no series perforated protection is considered A reflection loss and a limitation of the propagation loss are considered The considered front section of the silencer is 2 5 m2 A noise source with an acoustic power of 80 dB oct is considered Illustration of one of the effects see below the prediction of the insertion loss depending on the mean flow velocity in the airways see key in the graph insertion loss Di v 0 ms 1 a v 10ms 1 V 20ms 1 Di dB 1 10 100 1000 10000 100000 fi ioct Hz 31 63 125 250 500 1k 2k 4k 68k 16k v 0ms di 08 24 7 2 183 351 46 1 304 136 7 1 5 1 v 10ms 1 08 23 69 172 288 345
33. AB3 the way to account for gradually decreasing values of the sound power level inside the duct as the distance from the sound source increases is not as accounted with AB3 where is related to thermodynamics and frequency being accounted by the means of the sound attenuation A dB m due to internal ductwork losses as entered in worksheet in out CORED IN gt OUT the model for diffusivity factor Kd Km is selected as shown in the table below model SIN 3 source AB4 3 3 2 2 1 b Acoustics rectangular ducts break in noise Bloc diagram for rectangular duct walls break in noise The computation scheme of rectangular duct walls is according the bloc diagram below cf fig 3 4 fig 3 4 Beas Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRxx 015x Note 2 the main steps the steps involving a physical modeling being referred to from A to AG have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity Steps of the computation for rectangular duct walls break in noise Steps A to V See corresponding in Section 2 as far as sound reduction index of plates is concerned used for step X Isolation Technologie Services SARL au capital de 7000 Euros Si ge socia
34. AR only for applications related to air conditioning systems made of thin duct walls i e not for applications involving stacks made of thick duct walls This step aims at calculating the longitudinal attenuation per unit length of duct straight runs o Bibliography references ARI AR2 AR3 AR4 ARS o Comments when used the cut off frequency for the first higher mode fco is computed depending on the speed of sound c the Mach number in the airways M and the geometry of the duct according to various models as shown in the table below model HAN MUN Source AR1 AR2 among various models as shown in the table below v rectangular duct when used the model of longitudinal attenuation per unit length is selected ASH ASH ASH model aided PEE 150150 305 305 305 610 source AR3 ARA AR5 ARS ARS thickness 1 for for for mns rectangular rectangular rectangular rectangular A comment rectangular cross section cross section cross section dimension i j 0 10 t 150 mm 305 mm 305 mm iro i 150 mm 305 mm 610 mm 1 00m ASH ASH ASH Doe 610 610 1220 1220 1830 1830 ins source AR5 ARS ARS For for for rectangular rectangular rectangular comment cross section cross section cross section ZERo 610 mm 1220 mm 1830 mm attenua
35. CREER EE RCE UPPER SE RS PR Er SOS reve DLL ER EE ARLES me ba oid bai es P TUER wt Lei Li CT 3 18 18 1 a MIRI OI IN 5 a SE 0 preti me Dee TON TE T T4 M T WT Tur um 7 Wu TE TT Se de fe eR LEE EE a a ROUTE nsene EU RED FRS Sn Se es ESSE SLA lon s wm es ee D me ma Lm p mior Ieri Hag LEE EN CN M to 2 on Em Mr M M M t n M Mee mae mtm m n Rem ctm a Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 236 262 Appendix to Section 7 list of symbols General Cf corresponding in Section 1 2 3 4 5 6 Mouth Lw0 sound power level without soundproofing equipment dB ref 1pW i e in the entrance plane of the bend Lwl sound power level with soundproofing equipment dB ref 1pW i e in the exit plane of the bend Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 237 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mo
36. Input See placemark Limit set index ilim Input an p from 1 to 1 7 Half airway Input a positive real 0 1 Based on 6 Mass flow rate Input a real 32 645 14 Width B i Input a positive real 1 2 1 Height H m Input a positive real 1 2 2 Length L m Input a positive real 1 0 3 i Select a model in the Model of reflection loss ZER 18 proposed list Model of by pass correction Select a model in the ZER 17 for L gt 1m proposed list Select a model in the Aerodynamics upstream proposed list R 4 Aerodynamics downstream pega odel n ute R 4 proposed list Model of total pressure loss Select a model in the FRO 22 proposed list Model for the flow acoustic Select a model in the 2081B 21 power proposed list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 101 262 Worksheet in out CODIS1 1A for example 1A 4 1 only Cell for Foreseen action see Item input 1 3 Input See placemark Select a model in the Condition of propagation proposed list oxl oyl var 8 Screenshots of the worksheets for the example of computation Screenshot of worksheet in COALA 1A for example 1A 4 1 Sa m CER pu un SE
37. Step AT This step aims at taking into account the self noise of duct straight runs noise produced by the airflow For dissipative silencers o Bibliography references ATI AT2 AT3 AT4 AT5 o Comments the self noise acoustic power of flow noise Lw in dB ref 1E 12W is basically computed at frequency steps of 1 1 octave a for rectangular cross sections as well as for circular cross sections the determination of the self noise is done according various models as shown in the tables below model 2081B 3733A1 3733A2 3733B source AT1 AT2 AT3 AT4 CCE CCE CCE CCE for the models 2081 and 3733 a spectral correction is used according various models as shown in the tables below model 2081 FRO 3733 source AT4 AT5 AT3 Warning at the time of the writing of this manual all the consequences of the choice of one or the other model are not known with accuracy The choice of the model can be done by the user allowing tests and feed back Step AU This step aims at calculating the insertion loss of the duct including its self noise o Bibliography references AUI Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Repor
38. Steps A to V See corresponding in Section 2 as far as sound reduction index of plates is concerned use to be pr cised on the occasion of a future revision of this user s manual Preliminary remarks common to step AP and step AQ o Comments z the size of the cross section of the duct the length of the duct the flow rate are not related to the values selected in the worksheet in out COSIL for D corresponding input data are entered in worksheet in out COCID IN gt OUT Step AP This step aims at calculating the transmission loss with sound leaks with atmosphere at the front and at the rear regardless of the selected input data Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A o Bibliography references No particular bibliography has been considered o Comments Date Page 01 04 2015 176 262 if IL stat is accounted TL out R dif IL stat else TL out R dif the model for Rdif is selected as shown in the table below model 1 2 cf step cf step source AN AN Step AQ This step aims at calculating the break out sound power level with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references
39. The considered solid angle factor is 2 4 The considered diameter of the mouth is 0 2 m 5 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Screenshots of the worksheets for the example of computation Worksheet in COALA Item Cell tor Foreseen action Input See placemark input comment Temperature D6 Input a real number 14 1 1 Pressure D7 Input a real positive number 100000 2 Worksheet in out CONOZ o Input data Item pes Foreseen action Input See placemark comment mass flow rate Qm kg s I5 Input a real model of cut off i Select a model in the proposed P5 f frequency fco l list model of reflection vs Select a model in the proposed 2081 3 loss i list Solid angle factor P7 Input a positive real 2 4 Only in case of circular cross section Item ps Foreseen action Input See placemark comment diameter D m P47 Input a positive real 0 2 5 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr
40. as displayed in worksheet in out CODAP is required as an input in the worksheet in COALA for the thickness of the thin plate referenced 3 PLY The Poisson s ratio of the equivalent plate is set to the Poisson s ratio of the base thin plate The use of results of computations involving damping materials with Poisson s ratio not sufficiently close of the Poisson s ratio of the base thin plate is discouraged Step M This step being a complementary feature associated with step M aims at calculating the properties of series orthotropic plates in the acoustic structure i e plates for which the bending stiffness is dependent upon the direction of wave propagation In order to include the calculations in the general layout of the program an equivalent series thin plate is considered referenced ORTHO available in the list of thin plates of the worksheet in COALA for which the corresponding parameters are first derived from the input data of the layer by the use before using the worksheet in COALA of a complementary worksheet referenced in out COORT COmputation of ORThotropic plates Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 117 262 At the date of writing
41. cf section 5 cf section 6 Mountings and geometry The geometry used for the computation of bends is as follows inlet cross section outlet cross section rectangular rectangular circular circular rectangular circular 6 2 Scientific and technical background The prediction of acoustic performances of bends with SILDIS is founded on a scientific and technical background in relation with o analytical models for taking into account the properties of materials and various physical phenomena useful on the occasion of the computation o measurement results for feeding some of those models and for allowing the necessary improvement through correction factors of the correlation between some calculations and on site observations The obtained results are not comparable with standardized measurement due to the lack of such documents 6 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a All computations have been gathered in this single step for the sake of simplicity See corresponding in Section 1 6 2 2 Acoustics e Bloc diagram on fig 6 1 below acoustic power Fig 6 1 including self noise amp insertion loss with self noise AY insertion loss without self noise AW self noise AX Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRxx 015x Note 2 the main steps the steps involving a physical modeling being
42. ew 2 ma aa ma a oo Co a RR ru Le LI mo Lu in Ww Owem nmn ame tuu ENT net ww sd he smr pme u RAW ua ww m Eten nw tis eye EE CRIE OS NT II HUNI IMIiiIms III SSAI m E EI TATUS 3 cw mu mm EE HE ZNLNLIAXSILBNIIAN IA CEITPUEUCETUDHEEEEUUUE CE 79 7 comm 4 COPA Meque et erat fec abs peet eM ni X P SES FN gorda Lon Ly gent pe e me t tot ng LE LL 22 Pn 18 rmm LOTS ot Casta 95 tret Cmm Oc nha Drei nm Cpa f Seer Cum mn bes sinon P SOE ET COTM ET AN COR m Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date PhR15 008A 01 04 2015 SOLE lls ot worksheet in out BUTA for example 2 4 2 Example 2 4 3 perforated plate Envisaged application Page 150 262 It is foreseen to compute the engineering constants for a perforated plate consisting of a steel plate 41 with an open area ratio of 32 65 42 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in out COPERF for example 2 4 3
43. line in the following part of the present user s manual Worksheet in COALA for example 2 4 1a Cell for Foreseen action see See placemark Item Input input 1 3 comment Temperature Input a real number 20 15 Pressure Inputa real positive 101325 16 number Rear atmosphere 0 1 Fo NO mp POP IRE YES 1 24 input 1 Input an integer from 1 to Maximum set index imax 4 1 25 Select a reference Referenc material in the proposed AIR list for each layer of interest Incorporation of the series For NO press 0 for YES 0 perforated protections 0 1 press 1 Incorporation of the series For NO input 0 for YES 0 cloths 0 1 input 1 Reference Select a reference in the ALU 26 proposed list Model of losses Select a model in thie INT 28 proposed list Model of effective critical Select a model in the frequency proposed list Number of identical plates Tapata al positive 1 25 number Thickness Input a real positive 0 002 27 number Lw0 only known per 1 1 For NO input 0 for YES 1 20 octave frequency band 0 1 input 1 Input a real positive number as requested for a LRO 1 1 octave band sound 130 20 power level Worksheet in out COPERF for example 2 4 1a No input data required for the example of computation Worksheet in out CODAP for example 2 4 1a See corresponding for example 2 4 0 Worksheet in
44. oe omte LT wsaconan L Mets 1 oera EL 4 Banann gar COURENT LD r1 Ane LI 4 ia cet COPPA een corpay jean corra zaen pass corra comal pacer conen Couperus ai y j ICOALA vmm em ce TL Tu concu l Secun aww at ia co iico rL ICOnmpatabon of Enty Docts COmpution of u m Lente Stone Dien on MWODIRES scies Ailansetion O Lue em ICOEOLA E 4 txapatare af f Siregh Piety SOreperarion le scosme ot Acowee of ig ers Duti wers u MODULE sree Layers r r Geom cupon COMA PEN Compass at Lam mon seen wom i Pm C Omm mu somre L nou conen sem CON pan C NIH COmpetetes of Mah winana FF omen lasse tostes 1 doom paapaa COmeutasen of Sthetcers coces a COO j pee ex IConpetation of Conmpatanus of Duce sents ume a anaa a e icceenci CONDO KCaTou E ot REsoment Siencers ICORESPTL amp CORESP TR Fig 0 1a Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 19 262 verme reer px rere MODULES en b
45. room pressure or and with an air speed sometimes far from zero Note in the worksheets of the software and consequently in the present document special refers to input data for service conditions Fluid The fluid involved on the one hand in pores of porous media on the other hand in perforations of perforated protections and generally speaking in atmosphere is assumed to be in all cases clean dry air Note for dissipative silencers the fluid of which the carriage is considered through the dissipative silencer is assumed to be clean dry air Electro acoustic analogies The popular application of an equivalent network is a convenient representation and a useful method for the solution of many tasks in relation with the computation of acoustic layers based on electro acoustic analogies with electrical circuits sound pressure particle velocity and acoustic impedance being respectively analogous to voltage current and electrical impedance Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 21 262 Terms and definitions For the purposes of the present user s manual the following terms and definition apply Element 1 porous medium or 1 cloth or 1 perforated protection or 1 thin
46. security level safety 176 Worksheelts one ee ek EUER HAE ERE tee AE AML ea Pee Ete Rev ede nea 176 Input data alerts and results the key points 177 Worksheet in out CORED IN 2OUTI IRR 178 Worksheet in out CORED OUT gt IN ice 179 Worksheet in out COCID IN 2OUTr eese nennen enhn n nnne nnne nnne 180 Worksheet in out COCID OUT INJ eese nennen nennen emen emen emen enne nennen nennen nennen enne nei 181 3 4 Examples of computation with SILDIS sss 182 Example 3 4 1 rectangular duct wall ssssseeeeeeeeeeeenneneen eene nennen 182 Envisaged applicati n 5 2 mnnera tte tL inner vede ssh eoe fe sede ena uso da aede ese a des tin 182 Input data once tou etna meta ue e Eme 182 Screenshots of the worksheets for the example of computation 183 Example 3 4 2 circular duct wall ss 185 Envisaged application seen 185 Input data sien einer danse e eerie e li Aa ane haa de terit eter 185 Screenshots of the worksheets for the example of computation 186 Example 3 4 3 circular duct wall spiral seam pipe eseeeeeeeeeeeenee nennen 188 Envyisased application or pee ni
47. see lines 99 to 118 columns M to Z Nota the considered insertion loss is not the insertion loss of the partition i e the total acoustic structure The insertion loss IL stat is defined as IL stat R stat R stat with R stat sound reduction index of 1 plate such as those of set 0 whatever the quantity of such plates selected for set O is angular integration amp sound leaks included acoustic power without resp with the partition coupling 0 46 see lines 99 to 117 columns AA to AJ Worksheet in out COPPA0 o Input data no input data required o Main displays of the results Tables of results and graphs for sets 1 to imax without thin plate s with an impervious rigid back surface impedance at normal incidence see lines 47 to 65 columns A to L for real part columns M to X for imaginary part normalized surface impedance at normal incidence see lines 67 to 85 columns A to L for real part columns M to X for imaginary part absorption coefficient for normal incidence see lines 87 to 105 columns A to L Worksheet in out COPPA1 o Input data Cell for Item f Foreseen action Comment input boundary conditions E77 Select a model Gn the a proposed list model of radiation ratio of ES Select a model in the K77 free bending waves proposed list Simplified transmission factor for normal incidence G81 PAD Pu tor XES 0 1 i P Gene
48. uncertainties experimental determination of performances are required in the present status of the Art Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 162 262 Effects of back illustration 2 5 8 Imput data a lining is considered at test room pressure and temperature consisting of a single porous medium having at room temperature a flow resistivity in the direction normal to its surface cy1 12 5 kNsm 4 a porosity 0 95 model M76 with a thickness d 0 1m A series cloth with a superficial flow resistance Rs 30 Nsm 3 and a surface density ms 0 090 kg m2 is considered No series perforated protection is considered Illustration of one of the effects see below the prediction of the absorption coefficient at normal incidence depending on the backing of the porous medium see key in the graph absorption coefficient at normal incidence alphaO 1 20 impervious rigid back atmospheric back 1 00 PNR CAE 0 80 a S 0 60 suananai e T 0 40 e 0 20 A 0 00 1 10 100 1000 10000 100000 f Hz fi 8oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 25k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k mpervious rigid back 0 02
49. 008A 01 04 2015 17 262 General considerations 0 1 Introduction What does the present user s manual aims at The software SILDIS Sound Impact Limitation Design for Industrialized Solutions has been developed in order to allow for users among the team ITS or elsewhere the prediction of acoustic and aerodynamic performances of dissipative silencers and the prediction of acoustic performances of plane partitions and ducts The present user s manual aims at providing the scientific and technical background of this software presenting the available features of this software answering the question how to use SILDIS giving illustrative examples of the use of this software Qu 10 0 Note 1 see also report PhRxx 013x Sound Impact Limitation Design for Industrialized Solutions a single Excel based software for a wide range of applications to get answers to the question why when use SILDIS Note 2 see also report PhRxx 015x Collection of soundproofing constructions systems a companion to User s manual for the software SILDIS Comments SILDIS is a rolling tool for which work is on progress in relation with existing features being made available for users as soon as possible and with features to come to be modified involving possibly during a transient period the evaluation of some indicators of performance to be done thanks to several separate predictions until sufficient feed back allows to reduce the most approp
50. 04 2015 240 262 Note 2 the main steps the steps involving a physical modeling being referred to from BAA to BAC have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity e Steps of the computation Step BAA This step aims at calculating the sound power level downstream of the components resp downstream the full duct system as well as insertion loss of each component including its self noise o Bibliography references BAAI o Comments The sound power level downstream of the component including self noise Lw1 in dB ref 1E 12W is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Lw1 10 log 10 0 1 Lw0 Di 10 0 1 Lw Lw being the self noise acoustic power of flow noise in dB ref 1E 12W The insertion loss taking into account the self noise Di in dB is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Lw0 Lw1 In case of rectangular ducts the obtained results are comparable with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss 2004 Step BAB Thi
51. 3 15k 4k 5k 6 3k 8k 10k 12 5k 16k 20k 100kPa 04 06 09 13 19 26 34 43 52 60 69 79 91 106 128 159 200 248 299 31 1 201 110 62 35 21 12 08 05 03 02 200kPa o2 03 05 08 12 18 28 40 56 76 97 121 147 174 203 236 279 329 337 250 152 88 52 31 19 11 07 04 03 02 400kPa oio 02 03 04 07 1 17 26 42 68 107 162 230 293 324 321 316 337 322 199 128 78 47 29 18 11 07 04 03 02 Comment the pressure of the application influences sometimes considerably the acoustic performance of the silencer at least for some frequencies Depending on the frequency range of interest absorbers with a higher flow resistivity may be selected in case of pressure lines But the choice of a flow resistivity of the porous medium too big compared with the optimum required at the pressure of the application as far as acoustics is concerned can lead to a degradation of the performance for frequencies possibly within the range of interest See also the last paragraph of illustration 1 5 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 T6 262 Effects of a series cloth illustration 1 5 8 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters having no transverse solid pa
52. 302 139 72 51 v 20ms 1 0 4 14 44 85 116 153 196 137 7 2 5 2 Comment the flow velocity in the airways influences sometimes considerably the acoustic performance of the silencer at least for some frequencies due to the fact that the sound power level at the outlet of a silencer cannot be less than its self noise leading to a reduction of the insertion loss in case of high sound power level due to the airflow Attention has to be paid to limit the speed in the airways to acceptable values taking into account the difference between unsilenced sound power level of the source and the insertion loss without taking into account the self noise influenced for a given flow rate notably by the front area and the open area ratio of the silencer Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 80 262 Effects of the unsilenced sound power spectrum and of other uncertainties illustration 1 5 12 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters having transverse solid partitions inhibiting the sound propagation along the duct axis inside the non laminated lining consisting of a single porous medium having at room temperature a flow r
53. 63k 8k 10k 12 5k 16k v 0msi 03 05 08 13 21 32 48 7 2 10 5 150 21 0 28 5 37 1 458 52 5 55 7 558 542 48 9 367 244 158 102 66 43 28 19 12 08 v 10ms 1 0 4 06 09 14 22 33 50 7 5 11 0 15 6 218 29 6 385 474 543 57 3 572 553 49 4 364 240 155 100 65 42 27 18 12 08 v 20ms 1 03 0 5 08 12 19 29 44 66 297 138 194 265 346 428 49 3 526 53 1 520 47 8 37 0 250 164 107 69 45 30 19 13 09 Comment the flow velocity in the airways influences sometimes considerably the acoustic performance of the silencer at least for some frequencies due to the change that can occur in the propagation loss affecting the longitudinal attenuation relied to the conditions of propagation of sound in the lining and in the airways Generally speaking a negative airflow direction of airflow and direction of propagation of sound opposite involves an increase of the acoustic performance of the silencer when a positive airflow same direction for airflow and propagation of sound lead to a decrease of the acoustic performance of the silencer In particular the choice of a free area of the silencer relied to the front section of the silencer and to the open area ratio too small compared with the optimum required as far as acoustics is concerned can lead to a degradation of the performance for frequencies possibly within the range of interest Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0
54. 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 247 262 Worksheet in out IDS page 1 The prerie ef vfpensel s covm 9 tire be fe prevent sem Ane root Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 248 262 Appendix to Section 8 list of symbols General Cf corresponding in Section 1 2 3 4 Duct system Lplcalc sound pressure level with soundproofing equipment downstream of the duct system dB ref 1pW i e at a specified distance from the exit plane of the duct system calculated with SILDIS Lplref sound pressure level with soundproofing equipment downstream of the duct system dB ref 1pW i e at a specified distance from the exit plane of the duct system reference target imposed limit etc LwO0 sound power level without soundproofing equipment dB ref 1pW i e in the entrance plane of the component Lwl sound power level with soundproofing equipment dB ref 1pW i e in the exit plane of the component Lwlcalc sound power level
55. AL CIT ECET QU 221 7 1 2 4 Cmdm a coh Dok irs m COOrgeteton cf Kj c mquit Uoc hona de Oirpsen ed Cents rr kn Es NL TE M pm m IS ee un OAT 511 pee Jp Aes jus 104 ne 122 put Imt 1409 tubas icio eomm ips RD CIV V 0X COME POR Y ent 2 Screenshot of worksheet in out COSTDU te sesa i omi mew numm eee rai 5 ee te min 8 9 T CC sa PEA amm o eu ora me a NN nn nur fone nn abe meted ere ea e n aa ec et ory Casse a IIR AE BEHE ME EN ER Fuman sa uio pu ee mW w M IM 09 mme E t m ind d n L D Cs GAT ee a OA aT r 47i m a Past Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 206 262 Appendix to Section 4 list of symbols General Cf corresponding in Section 1 2 and 3 Straight duct Lw0 sound power level without soundproofing equipment dB ref 1pW i e in the entrance plane of the duct casing section of interest Lwl sound power level with soundproofing equipment dB ref 1pW i e in the exit plane of the duct casing section of interest Isolation Technologie Servic
56. Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss 2004 1 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a All computations have been gathered in this single step for the sake of simplicity o Bibliography references al a2 a3 a4 a5 o Comments in relation with partial derivatives Partial derivatives and related quantities which are usually employed to measure the equation of state of the fluid near the equilibrium state with various notations according bibliographic sources are written for the purpose of the present user s manual with the following notations n the isothermal compressibility of dry air is referred to as Cr Ge 1 a _ 1 V oP p oP T T the isothermal bulk modulus of dry air is referred to as Kr with Kr 1 Cr the adiabatic compressibility of dry air is referred to as Cs C B A a because C Cr k T T the adiabatic bulk modulus of dry air is referred to as K with K 1 C the coefficient of thermal expansion of dry air is referred to as p g L 2V 11 V oT p oT P P o Other comments when used the density of dry air pis computed according various models as shown in the table below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont
57. Break Out Noise this association basing the features of the MODULE 5 of the software described in the Section 5 of the present user s manual The routine referred to as COBEND COmputation of BENDs is basing the features of the MODULE 6 of the software described in the Section 6 of the present user s manual The routine referred to as CONOZ COmputation of NOZzle reflection is basing the features of the MODULE 7 of the software described in the Section 7 of the present user s manual The routine referred to as IDS COmputation of Impact of Duct Work is basing the features of the MODULE 8 of the software described in the Section 8 of the present user s manual All MODULES 1 to 8 are encapsulated in a single file The routine referred to as COSOD COmputation of SOund Decay is basing the features of the MODULE 9 of the software described in the Section 9 of the present user s manual MODULE 9 is encapsulated in a separate file As far as MODULES 1A is concerned A routine referred to as COALA 1A COmputation of Acoustic LAyers is associated with specific complementary routine the routine COSIL 1A COmputation of SILencers this association basing the features of the MODULE 1A of the software described in the Section 1A of the present user s manual MODULE 1A is encapsulated in a separate file Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d
58. Comment the sound power spectrum of the unsilenced source influences sometimes considerably the acoustic performance of the silencer at least for some frequencies in terms of longitudinal attenuation per 1 1 octave band and so in terms of insertion loss due to the combination of possibly high frequential variation on the one hand of the performance of the silencer and on the other hand of the spectrum of the source especially in case of pure tones such as produced by rotating machines Only in the case of a pink spectrum for the unsilenced noise source is the averaging of 1 3 octave band performance leading to a correct result for the 1 1 octave band longitudinal attenuation Attention has to be paid by the user of the software to use an 1 3 octave band spectrum for accurate sizing of dissipative silencers and to take a safety margin for the uncertainty of the available input data and of the conditions of on site installation of the silencer Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 81 262 Appendix to Section 1 list of symbols General f frequency Hz Lw0 sound power level without soundproofing equipment dB ref 1pW Lwl sound power level with soundproofing equipment dB ref I
59. F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A o Comments the model for TL out is selected as shown in the table below Date 01 04 2015 model 3733 MIX Source AL3 AL3 the way to account for gradually decreasing values of the sound power level inside the duct as the distance from the sound source increases is not as accounted with AL3 where is related to thermodynamics and frequency being accounted by the means of the sound attenuation A dB m due to internal ductwork losses as entered in worksheet in out COCID IN gt OUT the model for diffusivity factor Kd Km is selected as shown in the table below model SIN 3 source AL4 3 3 2 2 2 b Acoustics circular ducts break in noise Bloc diagram for circular duct walls break in noise fig 3 6 EJ Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRxx 015x Note 2 the main steps the steps involving a physical modeling being referred to from A to AQ have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity Steps of the computation for circular duct walls break in noise
60. Fig 1A3 Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRxx 002x pages 6 to 7 report PhRxx 006x pages 2 to 3 report PhRxx 015x Note 2 the main steps the steps involving a physical modeling being referred to as A 1A to K 1A have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity the calculation is carried out with the hypothesis of plane waves typically regarded as the least attenuated mode only for step H 1A are other modal contributions taken into account Note 3 analytical calculations are involved in steps A 1A and J 1A to K 1A empirical methods are involved in steps G 1A to 1A Note 4 step F 1A is depending on the conditions of axial sound propagation inside the lining Note 5 the bloc diagram above is suitable for rectangular dissipative silencers for the mounting SD e Steps of the computation Steps A 1A to F 1A Those steps aim at taking into account the properties of the filling of splitters cf fig 1A 4 and at calculating the propagation loss with flow of the silencer Sketch Nomenclature I land imp element l series Airway l E perforated I protection i D series cloth l c porous I I medium I E D C 5 Fig 1A4 Isolation Technologie Services SARL au capital
61. Item E lor Foreseen action Input See placemark input comment biggest dimension m BPs T l Input a real 0 5 5 smallest dimension m P24 Input a real 0 4 6 model of attenuation P32 PAIE A model ne 2081 R 9 Enr proposed list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 200 262 Worksheet in out COSTDU Item Cell for Foreseen action Input See placemark input comment mass flow rate Qm kg s Input a real 4200 3600 110 8 model of cut off frequency Select a model in the HAN fco proposed list model of insertion loss Serea model in the COEDLA proposed list duct length m Input a real 4 7 model of self noise Selecta ma in the 2081B 9 proposed list model of spectral correction Ss ud oe 2081 9 proposed list Only in case of a rectangular cross section Item Cell for Foreseen action Input See placemark input comment biggest dimension m Input a real 0 5 5 smallest dimension m Input a real 0 4 6 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COALA baies Co A erm m ue au arsi ie nn gg
62. Km proposed list Length of duct R172 Input a positive real o Main displays of the results Tables of results and graphs for a rectangular duct 1 plate alone such as those of set 0 break out sound reduction index see lines 75 to 100 columns AA to AN Tables of results and graphs for a rectangular duct 1 steel plate alone thickness such as those of set 0 break out sound reduction index see lines 102 to 123 columns AA to AN Tables of results and graphs for a rectangular duct set 1 set 0 coupling 0 insertion loss see lines 125 to 145 columns AA to AN Tables of results for a rectangular duct TL out Rdif ILstat break out transmission loss see lines 147 to 151 columns AA to AN Tables of results for a rectangular duct Lw out g break out sound power level see lines 156 to 160 columns AA to AN Tables of results for a rectangular duct Lw out break out sound power level see lines 162 to 166 columns AA to AN Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 179 262 Worksheet in out CORED OUT gt IN o Input data Item ipod d Foreseen action Comment input Model of cross over Select a model in the X
63. Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 190 262 Screenshot of worksheet in out COCID IN gt OUT Pane nena mm enr mt miam e ee IM TOUTS gt AZ Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 191 262 Appendix to Section 3 list of symbols General Cf corresponding in Section 1 and 2 Duct wall a biggest inner dimension of the cross section of a rectangular duct b smallest inner dimension of the cross section of a rectangular duct D inner diameter of a rectangular duct fco cut off frequency of the duct Hz fcr cross over frequency Hz fR annular expansion frequency Hz Miscellaneous See also corresponding in General considerations and in Section 1 and 2 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 192 262 page intentionally left blank Isolat
64. Mounting R to get N Mounting CO 1 2 to get DO 2 m Mounting Clto get D1 m Mounting Clto get D1 2d m Mounting C1 1 2 to get D1 1 2 m Mounting C2 to get D2 m Mounting C2 to get D2 2d m Mounting C2 2 to get D2 2 m Mounting C3 to get D3 m Mounting C3 to get D3 2d m Mounting C3 1 2 to get D3 2 m Mounting CR to get D m For D m z Mounting Q to get Q m Mounting Q to get Q 2d m Mounting CO to get DO m Mounting CO to get D0 2d m Mounting CO to get d a m Mounting CO to get d a bulk m Mounting RPT to get N Half airway h m Half airway h m Cell for Foreseen action Comment Input a positive real Input a positive real Input a positive real Input a positive real For NO input 0 for YES input 1 For the COmputation of REsonant Silencers with Pine Tree splitters only Input an integer from 1 to imax imax amp lt ilim lt imax amp being the total number of cloths and perforated protections accounted as porous media Input a positive real If a particular value of h d h is wished Input a positive real If a particular value of d h is wished Input a positive real 1 If a particular value of d h local is wished Input a positive real 1 If a particular
65. N N 1 Page 31 262 fig 1 4 cf worksheet CORESPTR fig 1 5 cf worksheet CORESPTL Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 32 262 Concerning the area of the duct upstream and downstream above and below the silencer A compared to the area of the overall section of the silencer Af predictions with the software SILDIS can be done with A Af Section of the duct above and below the silencer A RPTR RPTR depending on mounting RPTL RPTL A Af B H 1 2 Scientific and technical background The prediction of acoustic and aerodynamic performances of dissipative silencers with SILDIS is founded on a scientific and technical background in relation with o analytical models for taking into account the properties of materials and various physical phenomena useful on the occasion of the computation o measurement results for feeding some of those models and for allowing the necessary improvement through correction factors of the correlation between some calculations and on site observations For a rectangular silencer the obtained results are comparable with the standardized measurement with the plane wave excited alone as much as possible see NF EN ISO 7235
66. Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 20 262 Worksheets The software SILDIS is configurated in order to allow the user to access to several worksheets as shown on fig 0 1a 0 1 b and 0 1 c above in case of in in the name of a given worksheet the user should be prepared to input data in case of out in the name of a given worksheet the user should be prepared to get results Input data The software SILDIS is configurated in order to allow the user to input data by filling modifying yellow cells sometimes by the means of drop down menus allowing the selection of references of materials engineering constants models conditions of the application something like that something like that some users may not be allowed to input data by 2 67 filling modifying some yellow cells for the sake of simplicity 0 2 Scientific and technical background System of units The system of units used with the software SILDIS for input data and displayed results and consequently the system of units used in the present document is the International System of units some conversions factors being given when useful Reference conditions Reference conditions are involved in the expression on the one hand of input data and on the other hand of results with the software SILDIS diffe
67. P 8 P 9 P10 P 11 P 12 P 13 pa o Comments TET when used the boundary conditions are taken into account according various models as shown in the table below model condition SSE Simply Supported Edges CE Clamped Edges MID MIDSay between SSE and CE when used the free bending waves radiation ratio orad is computed according various models as shown in the table below model MAI NF P 1 P2 P 1 P2 source P 3 P 4 P 3 P 4 P5 P5 although not mentioned in references P 1 and P 2 considerations in relation with the eigen frequency corresponding to the mode 1 1 of the plate f11 are also considered The models MAI and NF differ only by the result obtained in the area of the critical frequency when used the transmission factor for normal incidence TO is computed either with a simplified model 1 TO proportional to the frequency or not simplified when used the loss factor n is taken into account in the way described for step M the transmission factor is computed according various models taking into account resp taking not into account various parameters as shown in the table below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E ma
68. Pa 2 The duct is made of steel 3 with a thickness 1 mm 4 with a width B 0 5 m 5 and with a height H 0 4 m 6 The length of the duct is 4 m 7 The flow rate is 4200 m3 h 8 Regarding models of computation the procedures basing the model referred to as 2081 are selected 9 Note the sound power spectrum upstream of the considered straight duct section is as shown in the table below 10 F Hz 63 125 250 500 1000 2000 4000 8000 Lw0 dB 80 8 68 3 48 9 44 9 40 2 39 5 44 0 39 1 ref IpW Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA Item Cel for Foreseen action Input See placemark input comment Temperature C Greed Input a real number 17 1 Pressure D7 Input a real positive 100000 2 TE 1 number Reference acoustic power D65 to D ne 80 8 68 3 48 9 44 9 10 spectrum K65 P i 40 2 39 5 44 0 39 1 Worksheet in out COEDLA Item rel for Foreseen action Input See placemark input comment mass flow rate Qm kg s I5 Input a real model of cut off frequency Select a model in the P5 fco proposed list Only in case of a rectangular cross section
69. Page PhR15 008A 01 04 2015 167 262 o Comments when used the cut off frequency for the first higher mode fco is computed depending on the speed of sound c the Mach number in the airways M and the geometry of the duct according to various models as shown in the table below model HAN MUN source X1 X2 the cross over frequency fer is computed depending on the speed of sound c the Mach number in the airways M and the geometry of the duct according to various models as shown in the table below model HAN NAS SMA source X1 X3 X4 for f fcr the model of transmission of sound is selected as shown in the table below model HAN NAS SMA source X1 X3 X4 for f gt fcr the model of transmission of sound is selected as shown in the table below model HAN NAS SMA source X1 X3 X4 the model of minimum for Rdif is selected as shown in the table below model HAN ZER source X1 0 the model of maximum for Rdif is selected as shown in the table below model HAN NAT source X1 the sound reduction index is derived as for the general case Step X This step being a complementary feature associated with step X aims at calculating the sound reduction index of a single leaf rectangular duct made of 1 steel plate alone with a thickness such as thos
70. SAB Source BAI Applicable even for non yes rectangular room Non diffuse sound fields no accounted Scattering no accounted Explicit formula for T y Comment as per BAI6 when one suppose a diffuse acoustic field this means that the dimensions of enclosed space are similar and that absorption is distributed in the whole space the existence of diffusing objects is moderating those limitations Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 255 262 o Comments when accounting modified absorption coefficients in order to limit them to 100 9o the reverberation time T is computed according to various general models as shown in the table below with the exception of model SAK all models are implemented in considering in parallel on the one hand original formulas and on the other hand modified formulas to account solid angles Model SAB EYR MIL CRE KUT BAD Source BAII BAI1 BAI1 equation 2 BAI2 BAI3 BAI4 BAI5 31 Applicable even for non rectangular yes yes yes yes yes yes yes room Non diffuse sound fields no no no no no no no accounted Scatt
71. Screenshots of the worksheets for the example of computation Screenshot of worksheet in COALA See corresponding 8 for example 1 4 1 Dem Screenshot of worksheet in COSIL for example 1 4 2a I ae mn ee nt Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 65 262 Screenshot of worksheet in out CODIS2 for example 1 4 2a EEUU ZM e Ses 22 je ERELT jm uiii E i d i mo plum Ter 2 Am Deme amu 44 1 84 1 2 1 244 1 2 1 264 7 mua 1 1 n J ua 1 imi 1 1 1 Om T ES TD E 1i LT HER 122 TL js HS a ume cue e v e m wa s e e e se E Louise ieee 388 Ar EI w en wat ie 4 nt DI pm RN msn qukm Cote ob ard f Pantin eren me aanas Ogres cone tes cn ge peme mieta tases non tes io mpm eem m ho gui 118 n9 2 Go im M dto Mog 4 A uere iust LL o t head n La em nnd dm and re rinde o aan o Ber gm wt IID d Tey Che peni omoi cepe b Phage Pec Ioab of Che germ jamais get temi ten Ho Rear Me gr Ho Son gg D role By ew at etn lf IT ie en mew Pt ord rir n 1o rmn rdi pee vn Terps fy of fe pal D Lm EV We we t ende Tn prin 07 foi ede Coen 4
72. Steps of the computation e no oo eo DOOR HDD dene pd dette dit do tete rte tn 32 1 2 2 A COUSUCS eicere nre eei deat tico ce te Ter 34 Bloc diagram for rectangular dissipative silencers and comments for other dissipative silencers and for POSOMACOLS 5555553 ATRES 34 Steps of the computation e E ten end eine 35 Step A conditions of the applications eee 35 Step B porous media used in the acoustic structure 35 Step C series cloths used in the acoustic structure 38 Step D series perforated protections used in the acoustic structure 39 Step E surface impedance of the multilayered acoustic structure with an appropriate back 41 Step F propagation loss with flow of the silencer 43 Step G by pass correction 46 Step H reflection loss in the silencer cciscceticccscetcdsecseticcascatedsnsserecsdsennedecacanccessceceduvacedesuuscenedeuscacceacaad es 47 Step I self noise of the silencer noise produced by the airflow 47 Step J insertion loss without taking into account the self noise 49 Step K insertion loss of the silencer including the self noise 49 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0
73. Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 203 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COALA Ss a _ wn ma T fet CT A n as we m E i nana A I a CE ome te i Load a Nn paa ab Lao oam mt Der COM CETT OG Tea VIXI LE AUS Am ome arie model A fact ctia eco cme Cimena e EF nomen mcn ni Pon Tom splen eee in ni Lg N ttim md rir iio ampie beum terni met 1 og T en gt lom nO o mmt le m nm Limp st M mpm d Pa fem U Cm af nds Done irat m Copa cf Riccar Duc boni i Congo ei Domit De b caben ite semen les COTE OS CORE DOR E m rye m d qn regn E en n Rond ohm MNT He Dent Wm Ro um tati un coma emo P inem i ir tr nr add nm m md A See 0 de na porum co ctun nt Scar oN and Ra on mm 08 cs Hp im idis m et mms edem rw tm Tm m md m Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its
74. Z Step AF This step aims at calculating the transmission loss with sound leaks with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references No particular bibliography has been considered o Comments if IL stat is accounted TL out R dif IL stat else TL out R dif the model for Rdif is selected as shown in the table below model 1 2 cf step cf step source AC AC Step AG This step aims at calculating the break in sound power level with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references AG AG2 o Comments the model for TL out is selected as shown in the table below model 2081 HAN source AGI AG2 3 2 2 2 Acoustics circular ducts 3 2 2 2 a Acoustics circular ducts break out noise Bloc diagram for circular duct walls break out noise The computation scheme of circular duct walls is according the bloc diagram below cf fig 3 5 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 172 262 fig 3 5 Note 1 the service conditions dependence has been omitted for the
75. account with the models of added impedance ROA and RDE is at the rear the porous medium of set i at the front the porous medium of set i 1 if i 4 even if i 1 gt imax the selection of a reference different of AIR for the porous media of set i such as i gt imax is highly discouraged or the front atmosphere if i 4 Note 3 the use in practical cases and the corresponding prediction of performance of a perforated protection in contact with something else than a porous medium that can be air at the front or a thin wire mesh spacer at the rear in some cases is highly discouraged for the total thickness of the acoustic structure d the following formula apply max max imax d di Pi di L d i 1 i 1 i 1 di resp d and d thickness of the porous medium resp the series cloth and the series perforated protection of set i I resp Id 0 or 1 depending on the incorporation or not of the considered element of set i in the acoustic structure omitted in the worksheets displays of the software for the sake of simplicity Note this formula is compatible with the definition of d given in 1 1 Step F This step aims at calculating the propagation loss with flow of the silencer o Bibliography references F1 F2 F3 F4 F5 o Comments The following governing equation is considered for the free duct with notations adapted from various so
76. action Comment input Temperature D5 Value reported from worksheet in COALA cell D6 Pressure D6 Value reported from worksheet in COALA cell D7 o Main displays of the results for the composite table of results Tables of results for the reference 2 PLY Young s modulus of the composite see cell V29 density of the composite see cell V30 Poisson s ratio of the composite see cell V31 loss factor of the composite see cell V32 thickness overall of the composite see cell V34 Tables of results for the reference 3 PLY Young s modulus of the composite see cell V39 density of the composite see cell V40 Poisson s ratio of the composite see cell V41 loss factor of the composite see cell V42 thickness overall of the composite see cell V44 limit at low frequency is displayed for the composite reference 3 PLY Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date PhR15 008A 01 04 2015 Worksheet in out COORT o Input data Page 133 262 Comment Item run tor Foreseen action input Modification of the Date displayed date possible Input a name for the Project considered project Configuration Input a name for the c
77. and for allowing the necessary improvement through correction factors of the correlation between some calculations and on site observations The obtained results are not comparable with standardized measurement due to the lack of such documents 4 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a All computations have been gathered in this single step for the sake of simplicity See corresponding in Section 1 4 2 2 Acoustics e Bloc diagram on fig 4 1 below acoustic power ertion loss v ut P insertion tose T nchin set nose Fig 4 1 sait nos AS z 8 2 amp insertion loss wth set noise AUI longitudinal atanuation sel nc T ar set nose AT Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRxx 015x Note 2 the main steps the steps involving a physical modeling being referred to from AR to AU have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Date 01 04 2015 Report PhR15 008A Page 195 262 e Steps of the computation Step
78. are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA for example 2 4 1b Cell for Foreseen action see See placemark Item Input input 1 3 comment Temperature D6 Input a real number 20 15 Pressure D7 Input a real positive 101325 16 number Reference W31 Select a reference in the ALU 26 proposed list 1 2 Y31 Select a number in the Select a model in the select 1 proposed list power level Model of losses W36 INT 28 proposed list Model of effective critical Select a model in the W37 frequency proposed list Number of identical plates X38 Input a real positive 1 25 number Thickness W39 Input a teal positive 0 002 27 number Lw0 only known per 1 1 For NO input 0 for YES octave frequency band 0 1 RS input 1 20 Input a real positive B65 to number as requested for a Tn K65 1 1 octave band sound nw 20 Worksheet in out COPERF for example 2 4 1b No input data required for the example of computation Worksheet in out CODAP for example 2 4 1b See corresponding for example 2 4 0 Worksheet in out COORT for example 2 4 1b No input data required for the example of computation Isolation Technologie Services SARL au capital de 7000 Euros Si ge s
79. at room temperature a flow resistivity in the direction normal to its surface 6y1 12 kNsm 4 a porosity 6 0 95 model M76 with a thickness de 0 08m No series cloth is considered no series perforated protection is considered Illustration of one of the effects see below the prediction of the absorption coefficient at normal incidence of the mix laminated lining and the comparison with a non laminated lining made with a thickness d ds dc 0 10m either 100 of the material of the surface layer or 100 96 of the material of the core layer see key in the graph absorption coefficient at normal incidence alpha0 1 00 SUC UE 911 0 90 e 12kNsm 4 s a 72kNsm 4 A 0 80 m 1 A mix 0 70 T 0 60 x 0 50 0 40 alpha0 0 30 0 20 0 10 0 00 T T T T 1 10 100 1000 10000 100000 f1 3oct Hz 25 315 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k 12kNsm 4 0 02 0 02 0 04 0 06 0 09 0 13 0 20 0 29 0 39 0 52 0 65 0 77 0 86 0 92 0 95 0 96 0 95 0 94 0 96 0 98 0 99 0 99 0 99 0 99 1 00 1 00 1 00 1 00 1 00 1 00 72kNsm 4 0 07 0 10 0 14 0 18 0 22 0 27 0 30 0 34 0 37 0 39 0 42 0 45 0 49 0 53 0 58 0 62 0 67 0 72 0 77 0 82 0 85 0 89 0 91 0 93 0 95 0 96 0 97 0 98 0 98 0 99 mix 0 05 0 07 0 0 0 15 0 21 0 28 0 36 0 43 0 49 0 54 0 58 0 61 0 62 0 63 0 64 0 64 0 66 0 69 0 75 0 80 0 83 0 88 0 91 0 94 0 95 0 96 0 97 0 98 0 98 0 99
80. case of an absorber bulk reacting with appropriate values of ox1 6y1 and porous media of sets with i gt 1 accounted as series porous media i e porous media acting as series impedances see remark and fig 1 9 below depending on dbulk and hbulk resp abulk for mounting C0 Remark the conditions of the propagation of sound inside an absorbing material are considered only with respect to a single given porous medium For ox1 cy1 1 or ox1 6y1 variable the other layers whatever they are if different of the porous of set1 have consequently to be taken into account using the electro acoustic analogies as series impedances Consequently porous media of sets i 1 are turned into series impedances in the following way the surface impedance obtained above the porous medium of set 1 is substracted to the surface impedance above set imax in order to get a series impedance that can be added to the 4 pole consisting of the porous medium of set 1 see fig 1 12 below Series impedance l l l Li Pos qx 1 l l xn I I l I T pi i i porous Set4 Set3 i Set2 i Sell Qum medium bi it b i of setl i p i 1 it it it 1 i i i 1 E gno xm EE NND EYE acoustic structure acoustic structure 1l Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35
81. considerations 0 1 Introduction andre POP Ra bi doh ton Para ete tto da pi dus qui aver oti Phe 17 What does the present user s manual aims at 17 EDAINI E EE AEE E EET A ATE AE AE AE EAE E AE AA AE E E 17 Operating conditions security level safety 17 General layout of the program necne tet ene re etie dress e Pere ous tei e esed 17 MorksheetsS c uH I ERROREM E A S A 20 Input datas oon eH PEERS PURI ORIENTE HEP IL ERN 20 0 2 Scientific and technical background sse 20 SAEIUEORISESRTOE OLD e EEEE E E E AE AE A AA KETENO EES 20 Reference ACO O 20 giro MEE EEE AT ATE T AT A AN A A A E A A 20 Electro acoustic analogies ii c ciicsccciidacacieds dbeaid acs tect ak bedada cadens da Abeta daca deanascdaeiadacaoeaete carole consents idea etens en 20 Remark regarding construction systems cccccesccceesseceeeeseeeeeeeneeeceenececeeaeeeeeseneeeceenneeeeeeneeeessnneeeess 23 Appendix to general considerations list of symbols and acronyms 24 Section 1 computation of silencers MODULE 1 of the software 1 1 Te GCN onnenn a an in 28 Terms and definitions ss 28 Mountings and geometry vrerin eeto e E EE E e ee Ea EENEN EEE EEEa EEE EES 28 1 2 Scientific and technical background ss 32 1 2 1 Thermodynamics and fluid dynamics eeeesseeseeeeeeeeenneen nennen nennen nennen 32
82. considered Illustration of one of the effects see below the prediction of the absorption coefficient at normal incidence depending on the temperature see key in the graph absorption coefficient at normal incidence alphaO 20 300 C 600 1 00 SS coe e OR Ke Ad TTL pas a a a 0 80 ee Se a A a a A a cS a A a lA nn T mn T T T 1 10 100 1000 10000 100000 f Hz f1 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 16k 2k 25k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k 20 C 0 00 0 00 0 01 0 01 0 01 0 02 0 04 0 06 0 09 0 14 0 21 0 31 0 43 0 56 0 70 0 82 0 92 0 98 1 00 0 99 0 96 0 96 0 98 1 00 0 99 1 00 1 00 1 00 1 00 1 00 300 C 0 00 0 00 0 01 0 01 0 01 0 02 0 03 0 05 0 08 0 12 0 18 0 26 0 36 0 48 0 61 0 73 0 82 0 89 0 92 0 93 0 93 0 93 0 95 0 97 0 98 0 98 0 99 0 99 0 99 1 00 600 C 0 00 0 00 0 01 0 01 0 01 0 02 0 03 0 05 0 08 0 12 0 18 0 25 0 34 0 43 0 53 0 61 0 68 0 74 0 79 0 82 0 84 0 87 0 90 0 92 0 95 0 96 0 97 0 98 0 98 0 99 Comment the temperature of the application influences sometimes considerably the acoustic performance of the lining at least for some frequencies For a given material an increase of the temperature involves generally speaking an increase of the flow resistivity everything else supposed to be equal In particular the choice of a flow resistivity of the porous medium at room temperature too big compared with the op
83. considering objects see lines 124 to 127 not accounting solid angles columns A to O accounting solid angles columns R to AB reverberation time considering eventually modified absorption coefficients see lines 136 to 208 Y mot considering atmospheric attenuation not considering objects see lines 136 to 156 not accounting solid angles columns A to O accounting solid angles columns R to AB Y considering atmospheric attenuation not considering objects see lines 161 to 181 not accounting solid angles columns A to O accounting solid angles columns R to AB Y considering atmospheric attenuation considering objects see lines 186 to 206 not accounting solid angles columns A to O accounting solid angles columns R to AB 9 4 Examples of computation with SILDIS Example 9 4 1 room with discrepancies in dimensions amp with non homogene distribution of absorbing areas Envisaged application It is wished to compute for a temperature 14 8 C 1 the reverberation time of an empty room with dimensions L 20 m 2 B 10m 3 H 5m 4 when neglecting atmospheric absorption 5 with absorption coefficients as follows short walls 0 10 6 long walls 0 20 7 floor amp ceiling 0 40 8 and with a scattering coefficient of 0 20 9 for all surfaces For models ISO and SAK elementary time period At s to be considered is 0 005 s 10 T30 to be considered 11 Input data The input data required for the computation are
84. d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 model MAR MEC al using ideal gas law al using source derived from a MARiottes s regression law model Page 33 262 the gas constant of dry air R J kg K is set to 287 or 287 053 or 287 10 depending on the eponym selected when used the dynamical viscosity of dry air n is computed according various models as shown in the table below model SUT VER MEC IDE a2 usin source ess a4 al usinga a2 using a slaw regression regression limiting 20 to 800 9 173 15 to 20 to 800 temperature C i 926 85 C Conversion micropoise centipoise poise kg m s factors g cm s Nsm 2 micropoise 1 107 10 107 centipoise 10 1 107 107 poise 6 2 1 gemi 10 10 1 10 kg m s 7 3 Nsm 2 10 10 10 1 Note v n p Conversion centistokes stokes m2 s factors mm2 s cm2 s centistokes 1 10 10 mm2 s stokes 2 E nd 10 1 10 m2 s 10 10 1 model INV MEC a1 using source a regression limiting 73 15 to temperature f 926 85 C when used the kinematic viscosity of dry air v is computed from a1 when used the adiabatic exponent of dry air x is computed according various models as shown in the table b
85. e eia wr Be grin Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 66 262 Example 1 4 2b dissipative silencer with a circular cross section Envisaged application It is wished to compute the acoustic and aerodynamic performance of a dissipative silencer with a circular cross section the area of the duct upstream and downtream above and below the silencer being not equal to the area of the overall section of the silencer overall diameter DO 1400mm 1 but being equal to the inner diameter length L 1500mm 3 having a lining of thickness d such as d d 1 100mm 5 made of one 7 homogeneous in directions parallel to and perpendicular to its surface bulk absorber 8 having the reference DEMO in the database for porous media of SILDIS 9 with 10 a cloth of thickness d 125 100 mm 11 having the reference DEMO in the series cloths database of SILDIS 12 without perforated protection 13 It is foreseen to use the silencer with an air flow rate of 24 1 kg s 14 at 20 C 15 at a pressure of 101325 Pa 16 It is decided to take into account a limitation of the propagation loss for L gt 1m 17 The reference spectrum is supposed of the type pink noise 19 with a sound power level of 13
86. extent in using a unique limiting value of the angle of incidence 78 80 85 in any case below 90 in order to reduce the discrepancies between prediction and measurement results especially at low frequency the user will input by the means of the proposed lists 0 for Omin the closer to the wished limiting angle value for max the model for 0L 90 gt using the pure approach basing the model referred to as DAV taking into account the dimensions of the partition the user will input by the means of the proposed lists 0 for min 90 for max and the model for OL DAV gt preferring not replacing by 0 5 the denominator of the formula above but being interested by the approach basing the model referred to as DAV the user will input by the means of the proposed lists 0 for Omin 90 for max and the model for OL MOI o Remarks in relation with the displayed results In case of rigid impervious back at the room conditions of temperature and pressure and with an appropriate selection of values of limiting angles of integration the displayed result s in terms of values per 1 3 octave frequency band computed from 1 21 octave frequency band values and in term of values per 1 1 octave frequency band are comparable with the standardized measurement see standard NF EN ISO 354 Acoustics Measurement of sound absorption in a reverberation room in terms of t
87. for a porous Bur medium being not a impedanc e should erforated protection p p be set to only ZER interactio ns with rear porous layer and front other comments porous valid for a porous layer medium being a accounted perforated protection by only selecting appropriat e model of added impedanc e cf below in case of a perforated protection when one wishes to account interactio ns with rear porous layer and front porous oniy layer like in B12 RDE model for added impedanc e should be selected other comments valid for a porous medium being a perforated protection interaction with rear series cloth not accounted interaction with front series cloth not accounted Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Date 01 04 2015 Report PhR15 008A Page 38 262 Y the following models of added impedance Model of added RDE ROA ZER impedance DRE source B12 B13 without additional with additional interaction d no interaction resistance effects resistance effects the model ZER applies notably for modeling a front added length blown away by an airflow in case of normalized
88. for coupling 0 96 with sound leaks 128 Step T sound reduction index with sound leaks for 1 leaf 128 Step U insertion loss for coupling 0 with sound leaks 128 Step V sound reduction index for coupling 100 with sound leaks eese 129 Step W sound reduction index with connections and with sound leaks 2 leaves eene 129 2 9 How to use SIL DIS een nomma encens 129 Operating conditions security level safety 129 Worksheets LE 129 Input data alerts and results the key points 130 Worksheet in out COPERF cccccccccsesseseseeeeeeececeeeeeeececeeeceeececeeececeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeees 131 Worksheet in out CODAP 2 5 rene EIER EE ss une SHEER EHEER ERE sauces EU ERE ESO ERE NER ERE REDE ER EE Edo 131 Worksheet in out COORT 133 Worksheet in COALAT ie 134 Worksheet in out COPPA ess e ess ss sensns sensa ns 134 Worksheet in out COPPADQ nre DH e PDT DIDI DS 136 Worksheet in out COPPAT er reor o ie e eon Ves Ege EN aes 1
89. ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 85 262 Section 1A computation of silencers with discontinued splitters MODULE 1A of the software 1A 1 Introduction Terms and definitions For the needs of the present user s manual the following terms and definition apply see NF EN ISO 14163 Acoustics Guidelines for noise control by silencers 1999 Silencer device reducing the acoustic transmission in a duct a pipe or an aperture without preventing the carriage of the fluid Dissipative silencer silencer attenuating the wideband sounds with a relatively low pressure loss and converting partially the acoustic energy into heat by friction on tubes having a porous or fibrous structure Mountings and geometry Silencers having rectangular cross sections are frequently used for industrial applications For dissipative silencers with discontinued splitters mountings for which predictions can be done with the software SILDIS are shown in fig 1 A1 E E fig 1A 1 cf worksheet CODIS 1A El 3 P m _e mounting RD Key of the previous figures 2d thickness of central splitters for mountings RD h 2h 2 width of extreme air way for mounting RD 2h width of central airways for mounting RD L length of the silencer without aerodynam
90. holes width of slit m d thickness m M surface density kg m R series flow resistance Nsm Rp parallel resistance losses due to mounting Nsm open area ratio Note subscript i for set i Silencer a a h 2 r m 2a width of airway m for mounting CO only abulk cf step F m alocal cf step F m A area of the duct above and below the silencer m Af area of the overall section of the silencer m Af area of the duct above and below the silencer when the area of the duct is not equal to the area of the overall section of the silencer m Ap free area of the silencer passage area of the airways m B width for mounting R R RPTR RPTR RPTL RPTL m d overall thickness of the acoustic structure m d 2d 2 for dissipative silencers thickness of extreme inner lagging for mountings R C1 C2 only thickness of lining for mountings Q CO only m 2d for dissipative silencers thickness of central splitters for mountings R R diameter of central pod for mountings C1 C2 only thickness of intermediate splitter for mounting C2 only m dbulk cf step F m dlocal cf step F m d 2d 2 for resonant silencers thickness of extreme inner lagging for mountings RPTR RPTL only 2d for resonant silencers thickness of central splitters m Da propagation loss dB m Da L longitudinal attenuation dB Di insertion loss with flow a
91. imax index up to 4 of the set located as far on the front side taken into account for the computation among the sets taken into account for the computation The elements belonging to sets with an index iximax are taken into account for the computation under the condition of selected quantities of elements different of 0 the elements belonging to sets with an index i gt imax are not taken into account for the computation whatever the selected quantities of those elements are example if imax 1 a perforated protection belonging to set 1 will be taken into account for the computation unless the considered quantity is 0 a perforated protection belonging to set 2 will not be taken into account for the computation even if the selected quantity is 1 Acoustic structure the whole stacking of acoustic layers of interest Note 1 for dissipative silencers the acoustic structure consists of elements for which the selected quantity is not 0 belonging to sets 1 to imax The acoustic structure is sometimes referred to as lining assuming an impervious rigid back for the considered duct and sometimes referred to as splitter assuming a symmetry plane opposite to the airway side equivalent to an impervious rigid back requiring sometimes for field applications a rigid centre plate implicitly supposed to be added to the real construction despite the lack of explicit corresponding input data with the software SILDIS Note 2 for plane partitions the a
92. in General considerations and in Section 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 164 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 165 262 Section 3 computation of duct walls MODULE 3 of the software 3 1 Introduction Terms and definitions For the needs of the present user s manual the following terms and definition apply No particular term or definition Mountings and geometry The geometry used for the design of ducts with the program SILDIS is shown in figure 3 1 rectangular duct wall circular duct wall cf worksheet CORED cf worksheet COCID fig 3 1 Key of the previous figures a biggest inner dimension of the cross section of a rectangular duct b smallest inner dimension of the cross section of a rectangular duct D inner diameter of a rectangular duct 3 2 Scientific and technical background The prediction of acoustic performances of ducts with SILDIS is founded on a
93. in the exit plane of the duct casing section of interest Casing TL out sound transmission loss of the duct wall casing dB Lw out sound power level radiated by duct casing walls dB ref 1pW Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 219 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 220 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 221 262 Section 6 computation of bends MODULE 6 of the software 6 1 Introduction Terms and definitions For the needs of the present user s manual the following terms and definition apply No particular term or definition cf section 1 section 2 cf section 3 cf section 4
94. in the worksheets listed below Regarding the COmputation of BENDs the software SILDIS is configurated in order to allow the user to access to various worksheets being linked as shown in fig 4 2 the overview of the worksheets being shown in table below in out COEDLA gt in out COSTDUC Fig 4 2 Note temperature and pressure conditions as well as reference spectrum one should enter in worksheet in COALA Worksheet Suitable for mountings Input data Results for climatic conditions for reference in COALA all spectrum COmputation of Empty in out COEDLA Ducts Longitudinal for duct dimensions indicators of performance acoustics Attenuation g COmputation of STraigtht m in out COSTDUC DUct for duct dimensions flow rate indicators of performance acoustics cts Input data alerts and results the key points Worksheet in out COEDLA o Input data Item un tor Foreseen action Comment input mass flow rate Qm kg s I5 Input a real useless input data given the development of SILDIS Ios outon frequency P5 selet a model Sae useless input data given the development of SILDIS fco a proposed list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its
95. integration see corresponding at step P o Remarks in relation with the displayed results see corresponding at step P Step R This steps aims at calculating the sound reduction index with connections without sound leaks o Bibliography references R1 R2 R3 R4 R5 R6 Comments Connections for a double shell partition consisting of thin plates of set 0 and 2 are taken into account according various models a general model concerning the computation for Rdif as shown in the tables below model FAH DAV SHAI SHA2 SHA3 Souls R1 R1 R1 R2 R1 R2 R1 number of identical according according 1 1 1 plates for input data input data each leaf Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Page 127 262 for the general model DAV only a sub model for Rdif as shown in the tables below model 1990 2009 2012 source R4 R5 R6 for the general model DAV only a sub model for Rdif as shown in the tables below model BYO PWL ZER source R6 Brine Your Plasterboar comment E d Walls ZERo Own Leaves
96. is symmetrically mounted along the z direction m Rdif sound reduction index for a diffuse field Rstat sound reduction index for statistic incidence a0 absorption coefficient for normal incidence astat absorption coefficient for statistic incidence asab Sabine s factor g angle of orientation min minimum angle of orientation for angular integration max maximum angle of orientation for angular integration 0 angle of incidence Omin minimum angle of incidence for angular integration Omax maximum angle of incidence for angular integration tstat transmission factor for statistic incidence Plates d overall thickness m D x highest bending stiffness per unit width Nm D z lowest bending stiffness per unit width Nm E Young s modulus N m2 fc critical frequency for an isotropic plate Hz Note superscript for test room conditions fceff effective critical frequency for an isotropic plate Hz Note superscript for test room conditions fcx lowest critical frequency Hz Note superscript for test room conditions fcz upper critical frequency Hz Note superscript for test room conditions fii frequence corresponding to the mode 1 1 of the plate Hz M mass density kg m2 w lateral transverse displacement m n loss factor v Poisson s coefficient p density kg m3 Note subscript i for set i Perforated plates open area ratio Miscellaneous See also corresponding
97. its acoustique fr Report Date Page PhR15 008A 01 04 2015 128 262 Step S This steps aims at calculating the sound reduction index of sound leaks for 1 leaf i e when is considered not sets 0 to imax as it is considered for step S but 1 plate alone such as those of set O regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and at the rear regardless of the corresponding input data o Bibliography references see corresponding of step S o Comments see corresponding of step S To be continued Step T This steps aims at calculating the sound reduction index for coupling 0 with sound leaks o Bibliography references T1 o Comments The sound reduction index derived by the means of the present step is referenced R stat o Remarks in relation with the angular integration in case of use of the model INT see corresponding of step P o Remarks in relation with the displayed results see corresponding of step P To be continued Step T This steps aims at calculating the sound reduction index with sound leaks for 1 leaf i e when is considered not sets 0 to imax as it is considered for step T but 1 plate alone such as those of set 0 regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and
98. its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 180 262 Worksheet in out COCID IN gt OUT o Input data Cell for Item Foreseen action Comment input Diameter D AH49 Input a positive real Length L AHSI Input a positive real Mass flow rate AH53 Input a positive real Model of cut off frequency AH64 Select a model in the fco proposed list Model of mounting R85 pelota modena the proposed list Model of annular expansion Select a model in the R108 t frequency fRokt proposed list Model of HF limitation R113 Selecta model nthe proposed list Model R131 Select a model in the proposed list i Select a model in the 1 first approach displayed in the same worksheet Model for Rit pue proposed list 2 second approach displayed in the same worksheet Accounting IL stat 0 1 R151 Fo m DNS input 1 AB154 to Ai A dB m ALI54 Input a positive real model R158 Select a model in the proposed list model R164 Select a model in the proposed list Model for diffusivity factor R168 l Select a model in the Kd Km proposed list Length of duct RI72 Input a positive real o Main displays of the results Tables of results and graphs for a rectangular duct 1 plate alone such as those of set 0 break out sound reduction index see lines 75 to 100 columns AA to AN Tables of results and graphs for a r
99. level downstream of bend see lines 78 to 82 columns S to AD D insertion loss with self noise Di see lines 84 to 87 columns S to AD Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 225 262 6 4 Examples of computation with SILDIS Example 6 4 1 circular bend Envisaged application It is wished to compute the acoustic performance of a circular bend for room conditions temperature 17 C 1 pressure 1ES Pa 2 The sound power spectrum upstream of bend is as shown in the table below 3 F Hz 63 125 250 500 1000 2000 4000 8000 Lw0 dB 73 3 60 6 45 0 41 1 37 0 34 7 37 4 32 5 ref IpW The flow rate is 1400 m3 h 4 Model of cut off frequency fco not accounting flow speed is selected 5 Bend radius is considered 6 adimensional bending ratio being 0 15 7 Regarding models of computation the procedures basing the model referred to as 2081 are selected 8 The duct is with a diameter D 250mm 9 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the presen
100. list SHA3 38 sub model for general model Select a model in the DAV proposed list model for connections for Select a model in the general models roposed ist L L 39 SHA1 SHA2 SHA3 prap distance between Dae ope Input a positive real 0 6 40 connections m vibration transmission factor not for general models FAH DAV SHA1 SHA2 SHA3 compliance of connections for the general model DAV for the compliance model BYO in mN 1 Input a positive real model of compliance for general model DAV Input a positive real number of connections per m2 m 2 Select a model in the proposed list vibration transmission factor not for general models FAH DAV SHAI SHA2 SHA3 Input a positive real compliance of connections for the general model DAV for the compliance model BYO in mN 1 Input a positive real Input a positive real Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date PhR15 008A 01 04 2015 Screenshots of the worksheets for the example of computation Screenshot of worksheet in COALA for example 2 4 2 Page 149 262 HEN CE Sees 3 aes wer at 194 XwT lt ae cus ww 2
101. models accounted Input data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with o o the input data See corresponding in the chapter General considerations As far as porous media series cloths and series perforated protections are concerned specific data bases libraries will allow the design to be made with in built engineering data constants referred to as Usual in the worksheets of the software Warning some properties of the presently referenced materials still not have been checked by reliable sources See also report PhRXX 015 Collection of soundproofing constructions systems a companion to User s manual for the software SILDIS data base library for porous media v contents of the library 21 possible references of material layers data base library for series cloths Y contents of the library 21 possible references of material layers Note the cloth referenced RESISTAIR can be used with an appropriate value for the flow resistance for the simulation of losses of a thin plate for example at normal incidence due to the conditions of mounting data base library for series perforated protections v contents of the library 21 possible references of material layers some alerts in case of input data involving a warning of the user the place where and the way some results are presented Those key points are reviewed workshee
102. nnne enne neren nennen 251 Bloc diagram eoe sb ox enb oleo viae celle e PE eite eel ede BRE ee 251 Steps of the computation ee ere Pee RIT ee pH CU et ee Hp Pe Ed 251 9 3 How to use SILDIS er 256 Operating conditions security level safety sse 236 WorkKShe ts EM EET TD 257 Input data alerts and results the key points 258 9 4 Examples of computation with SILDIS sss 259 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 15 262 Example 9 4 1 room with discrepancies in dimensions amp with non homogene distribution of absorbing Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 16 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15
103. of acoustic performances of bends with SILDIS is founded on a scientific and technical background in relation with o analytical models for taking into account the properties of materials and various physical phenomena useful on the occasion of the computation o measurement results for feeding some of those models and for allowing the necessary improvement through correction factors of the correlation between some calculations and on site observations The obtained results are not comparable with standardized measurement due to the lack of such documents 7 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a All computations have been gathered in this single step for the sake of simplicity See corresponding in Section 1 7 2 2 Acoustics e Bloc diagram on fig 7 1 below sound power insertion loss without including self Fig 7 1 self noise AZ noise amp insertion oss with seif noise AAB self noise AAA f Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRxx 015x Note 2 the main steps the steps involving a physical modeling being referred to from AW to AY have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity e Steps of the computation Step AZ This step aims at calculating the insertion
104. of cloths and perforated protections accounted as porous media i e not accounted as series cloth resp series perforated protections using electro acoustic analogie Dry air a diffusivity m s c adiabatic velocity of sound ms Cp specific heat capacity at constant pressure J kg K G adiabatic compressibility Pa Cr isothermal compressibility Pa k wave number rad m Ks adiabatic bulk modulus Pa Kr isothermal bulk modulus Pa t temperature C P static atmospheric pressure Pa Pr Prandtl number R gas constant J kg K V volume m Z characteristic impedance Nsm p coefficient of thermal expansion T propagation constant rad m n dynamical viscosity Nsm thermal conductivity W m K wavelength m v kinematic viscosity m s p density kg m3 subscript superscript subscript superscript for normal conditions 0 N for test room conditions 0 5 T front atmosphere 0 for service conditions rear atmosphere 0 uid Porous media a a coefficients for the expression of Dan b b coefficients for the expression of Zan Ci C2 C3 C4 C5 C6 C7 Cg coefficients for the expression of L an and Zan Cserr adiabatic compressibility Pa E non dimensional parameter related to frequency flow resistivity and density of dry air Kerr adiabatic bulk modulus Pa RG bulk density kg m Za characteristic imp
105. of the silencer at least for some frequencies In particular the choice of a flow resistivity of the porous medium too big compared with the optimum required as far as acoustics is concerned can lead to a degradation of the performance for frequencies possibly within the range of interest For a given porous medium an increase of the density involves generally speaking an increase of the flow resistivity everything else supposed to be equal for example attention has to be paid to the consequences of the use in some locations of high Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 70 262 density rock wools using bonded short fibers producing possibly linings with a high flow resistance in some cases especially when nothing is known regarding the properties of those materials in terms of flow resistivity porosity Effects of the properties of porous media in a laminated lining illustration 1 5 2 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters having transverse solid partitions inhibiting the sound propagation along the duct axis inside the laminated lining consisting of a surface layer being a
106. out COORT for example 2 4 1a No input data required for the example of computation Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Worksheet in out COPPA for example 2 4 1a Page 140 262 See placemark see 2 3 How to use SILDIS Operating conditions security level safety proposed list Item Foreseen action Input comment Size of the baffle in which the partition is symmetrically ae mounted along the x Input a positive real 4 5 direction Size of the baffle in which the partition is symmetrically ae x mounted along the z Input a positive real 3 5 direction Size of the partition along ER X the x direction Input a positive real 1 Size of the partition along 2s 7 th z direction Input a positive real 1 uni Ms Select a value in the Fi min proposed list 5 625 6 Select a value in the Fi max proposed list 84 375 i vg Select a value in the M Teta min proposed list 0 30 Select a value in the Teta max proposed list 89 375 30 Model for teta L Select a model in the 90 29 proposed list lengt
107. physical modeling being referred to from A to AB have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity Steps of the computation for rectangular duct walls break out noise Steps A to V See corresponding in Section 2 as far as sound reduction index of plates is concerned used for step X Preliminary remarks common to step X and step X o Comments n the size of the cross section of the duct the length of the duct the flow rate are not related to the values selected in the worksheet in out COSIL for B and H corresponding input data are entered in worksheet in out CORED IN gt OUT Step X This step aims at calculating the sound reduction index of a single leaf rectangular duct made of 1 plate alone such as plates of set 0 regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references X1 X2 X3 X4 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date
108. propagation constant l A expressed as Lan a E j a E and in case of normalized characteristic impedance ZA expressed as Zan 1 b EP j b EP the following relations apply cjzb co B 3c3 b cy B 3c5 a c c7 a c with E p f o where f is the frequency Hz and pis the density of air kg m3 see the comments concerning series perforated protections no influence of the speed of the airflow is taken into account for the computation Conversion MKS 5 Rayl m CGS units factors 4 Nsm MKS Rayl m 1 10 Nsm CGS units 10 1 Step C This step aims at taking into account series cloths used in the acoustic structure o o Fig 1 6 Bibliography references series cloth C1 C2 C3 C4 C5 Comments depending on the general used model some of the following parameters are taken into account superficial flow resistance Rs Nsm 3 surface density M kg m2 parallel resistance losses due to mounting Rp Nsm 3 E N m2 Young s modulus Poisson s ratio v plate dimension a m as well as boundary conditions general model PLATE I PLATE2 PLATE3 PLATE4 FRO M M M M Rs E E E E M parameters v v v v Rp a a a a boundary conditions boundary conditions boundary conditions boundary conditions as entered for thin plate as entered for thin plate as entered for thin plate as entered for
109. referred to from AW to AY have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 222 262 e Steps of the computation Step AW This step aims at calculating the insertion loss without self noise of bends o Bibliography references AWI AW2 AW3 AWA o Comments when used the cut off frequency for the first higher mode fco is computed depending on the speed of sound c the Mach number in the airways M and the geometry of the duct according to various models as shown in the table below Step AX This step aims at calculating the self noise of bends o Bibliography references model HAN MUN Source AWI AW2 when used the model of 90 bend type is selected among various models as shown in the table below model SH ED SH ED TV BE RA source AW3 AW3 AW3 SHarp comment SHarp Edged with BEnd EDged with Turning RAdius Vanes AXI AX2 AX3 AX4
110. s stokes 2 n cm s 10 1 10 m2 s 10 10 1 when used the adiabatic exponent of dry air is computed according various models as shown in the table below model INV MEC al 1A source using a regression limiting 73 15 to temperature i 926 85 C is set to 1 399 or 1 400 or 1 401 or 1 402 depending on the eponym selected model when used the specific heat capacity at constant pressure of dry air c is computed according various models as shown in the table below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 88 262 model MEC MEC2 KRA al 1A a1 1A using a ee regression regression 8 a3 1A for Pr the Source for a the using a ME regression Mae regression AM regression for cp being ad inter being in in error error limiting 73 15 to 173 15 to 20 to 800 temperature 926 85 C 926 85 C C Conversion B J cal factors J I 0 2388 cal 4 1868 1 2 the following relation apply K 1 IE Cs cy p when used the thermal conductivity of dry air is computed according various models as shown in the table below model MEC KRA al 1A
111. s manual the following terms and definition apply cf NF EN ISO 3382 2 Reverberation time T duration necessary for the average acoustic volumetric energy in a room to decrease by 60 dB after noise off Reverberation time can be computed by using a dynamic range below 60 dB and then extrapolating to the time corresponding to a 60 dB decay It is then noted accordingly Thus if T is derived from the first instant where the decay curve reaches 5 dB and 25 dB below initial level it is noted T20 If decay values from 5 dB to 35 dB below the initial level are used it is noted T30 Geometry In case of a rectangular shoebox shaped room the geometry is as follows this is not the only geometry for which simulation can be performed Zz fig 9 1 xz xzL 9 2 Scientific and technical background The prediction of sound decay in a room with SILDIS is founded on a scientific and technical background in relation with o analytical models for taking into account the various physical phenomena useful on the occasion of the computation o measurement results for feeding some of those models and for allowing the necessary improvement through correction factors of the correlation between some calculations and on site observations As far as reverberation time is concerned the obtained results are comparable with the standardized measurement see NF EN ISO 3382 2 Acoustics Measurement of room acoustics parameters Part 2 reverberation ti
112. scientific and technical background in relation with o analytical models for taking into account the properties of materials and various physical phenomena useful on the occasion of the computation o measurement results for feeding some of those models and for allowing the necessary improvement through correction factors of the correlation between some calculations and on site observations The obtained results are not comparable with standardized measurement due to the lack of such documents 3 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a All computations have been gathered in this single step for the sake of simplicity See corresponding in Section 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 166 262 3 2 2 Acoustics 3 2 2 1 Acoustics rectangular ducts 3 2 2 1 a Acoustics rectangular ducts break out noise Bloc diagram for rectangular duct walls break out noise The computation scheme of rectangular duct walls is according the bloc diagram below cf fig 3 3 fig 3 3 Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRXX 015 Note 2 the main steps the steps involving a
113. see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in out CODAP for example 2 4 5 Item Cell for Foreseen action Input See placemark input comment Select a reference of material in the proposed Reference list for each layer of GLASS PVB GLASS 48 50 52 interest Thickness Inputa real positive 0 004 0 0005 0 004 49 51 53 number Model of composite Select a model in the MAX 54 proposed list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 153 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out CODAP for example 2 4 5 ms hee imm ment der COUR LIRE c A hee uon cle Vin rif awom oin boies hoe 82e Xt a pene a Ld vm rms m Mi Cpa d Dini s Mmi Oen n of FE vmm ers set hey Td ln strom ns oant hr CODES CHEN A A n E i 5 E he of dea progama IE DES uret er fis pest tar Lemme apat o Mipya Ped e a d rie ek v Ludo mpari commen Dec Va ld but Rt C Ba hth bed ty Dam on tokat ef TR reina en n cad rp Ve Male Ti Visi tio ad a Le perdi cl md om
114. ser ong dem snm beta be mpi Dege ml i GLEN RAW ua BH p DE mu J en mua sind mE Erho Loy Try pet pe te mm ute n etit np et 2 LL 22 Pn 18 rmm LOTS ot Casta 95 tret EE Coram otra Drei bere oy Cpu on d mn Cem s 1 OS NT II HUNI IMIiiIms III SSAI m iste ipm d dg a it EN ma ima i m a i irr ws mn hes sesame fee LOCI DET P COBRE HIT AN COR ot Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 146 262 Screenshot of worksheet in out COPPA1 for example 2 4 1b only dud d IB i Example 2 4 2 double leaf partition with connections Envisaged application It is foreseen to use the following conditions temperature 20 C 15 pressure 101325 Pa 16 The reference spectrum is supposed of the type pink noise 19 with a sound power level of 130 dB oct 20 It is wished to compute the sound reduction index with an atmospheric back 24 of a double leaf partition consisting of 25 aluminium plate 26 of thickness 2mm 27 the intrinsic losses of the material being considered 28 32 steel plate 33 of thickness 2mm 34 the intrinsic losses of the material being considered 35 with a infinite extend 29 a
115. silencer R33 Select a model in the E proposed list Model for Lw out R38 Select a model in the proposed list Finite elements method 0 1 R40 Input 0 to answer no The recourse to finite elements method makes sense in E input 1 to answer yes case of ducts with a big length or in case of silencers o Main displays of the results Tables of results sound power level radiated out of the duct casing section of interest see lines 42 to 46 columns AA to AN a sound power level downstream of considered section of duct silencer sound power level radiated out of the duct casing section of interest see lines 48 to 52 columns AA to AN Note Tables of results already displayed in other worksheets being input data for the present worksheet sound power level in the exit plane of the duct casing section of interest see lines 18 to 22 columns AA to AN sound transmission loss of the duct wall casing see lines 25 to 29 columns AA to AN insertion loss of the silencer see lines 31 to 34 columns AA to AN longitudinal sound attenuation see lines 36 to 39 columns AA to AN 5 4 Examples of computation with SILDIS Example 5 4 1 circular duct wall spiral seam pipe Envisaged application It is wished to compute the sound power level radiated out of a circular duct walls spiral seam pipe for room conditions temperature 17 C 1 pressure 1E5 Pa 2 The duct is made of steel 3 for which t
116. social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Worksheet in COALA 1A for example 1A 4 1 Page 100 262 Foreseen action see See placemark De 1 3 Input comment Temperature Input a real number 20 15 Pressure ia 101325 16 Maximum set index imax Mun n fromt to 1 7 Select a reference material in the proposed Reference list for each layer of DISN DISP 8 9 interest Thickness Input nde iuum 0 19930 5 Select a reference material in the proposed Reterence list for each layer of Eus 13 interest Incorporation of the series For NO press 0 for YES 1 13 perforated protections 0 1 press 1 Thickness ice add 0 0007 12bis Select a material in the Reference proposed list for each DIS 12 layer of interest Incorporation of the series For NO input 0 for YES 1 10 cloths 0 1 input 1 Thickness bd oc 0 00005 11 Lw0 only known per 1 1 For NO input 0 for YES 1 20 octave frequency band 0 1 input 1 Input a real positive number as requested for a ie 1 1 octave band sound 20 power level Worksheet in COSIL 1A for example 1A 4 1 only Foreseen action see Item 1 3
117. take into account the reflection loss 18 The reference spectrum is supposed of the type pink noise 19 with a sound power level of 130 dB oct 20 It is chosen to predict the self noise of the silencer in the way described with the model referred to as 2081B 21 It is chosen to predict the back pressure with the model referred to as FRO 22 Input data The input data required for the computation are listed hereafter in reference with the above data see figures in brackets in the previous used as placemarks for explaining the selection below The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Page 59 262 Worksheet in COALA for example 1 4 1 and for example 1 4 2a and for example 1 4 2b Foreseen action see See placemark Den 1 3 Input comment Temperature Input a real number 20 15 Pressure Tip t a real positive 101325 16 number Maxi
118. tede bem pere Fare eu a e v pe dein Rage dea gen 188 Input data ML RE a a 188 Screenshots of the worksheets for the example of computation 189 Appendix to Section 3 list of symbols sss 191 Section 4 computation of duct straight runs MODULE 4 of the software 4 1 Introduction SE R DEAAmA 194 Terms and definitions a e ete NE nt ordonne dangers dete ge eed eee demi done ges 194 Mountings and geometry 5 odere e e t pte eed e tesa det vend depo ease ea Eae dn 194 4 2 Scientific and technical background sss 194 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 11 262 4 2 1 Thermodynamics and fluid dynamics eseeseeeeeeeeeereeneneen eene nere 194 Steps of the computation sr 194 4 2 2 ACOUSLCS 5 sii eet eee atre tese eio e eode ne ete nel res ones ste lee utes ete RU euo int site ie 194 Bloc diagram PH OS Steps of the conibutation M ELEM IDE Step AR longitudinaf a attenuation per unit it length TS 195 Step AS insertion loss without flow noise 196 Step AT flow noi
119. the use in some locations of cloths producing possibly linings with a high flow resistance especially when nothing is known regarding the properties of this materials in terms of flow resistivity porosity Attention has to be paid also to dust deposits in a position in some cases of involving effects comparable to the effect of a series cloth Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 77 262 Effects of a series perforated protection illustration 1 5 9 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters the splitters having transverse solid partitions inhibiting the sound propagation along the duct axis inside the non laminated lining consisting of a single porous medium having a flow resistivity cy 72kNsm 4 a porosity 0 95 model M76 with a thickness d 0 1m The perforated protection consists of a sheet R3T5 round holes with an hexagonal arrangement diameter 3 mm open area ratio 0 3265 of thickness 1 mm general model MOI model for the added impedances ROA Illustration of the effect see below the prediction of the propagation loss without and with the perforated protection
120. the user in this case Remark regarding construction systems Construction systems for field applications including sketches and nomenclatures for which the design is possible with the software SILDIS are not described in an exhaustive manner in the present document being the object of a separate document for a sake of simplicity One will see the document referenced Collection of soundproofing constructions systems a companion to User s manual for the software SILDIS illustrating the possibilities of use of the software for practical cases report PhRxx 015x Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 24 262 Appendix to general considerations list of symbols and acronyms General Cf corresponding in Section 1 Electro acoustic analogies Pi sound pressure of the incident wave Zis internal source impedance Zr radiation impedance Reference conditions Cf corresponding in Section 1 for dry air Miscellaneous See also corresponding in Section 1 and in Section 2 Acronyms COALA COmputation of Acoustic Layers CODAP COmputation of DAmped Plates COORT COmputation of ORThotropic plates COPERF COmputation of PERForated plates COPPA COmputation of Plane PAr
121. value of d h bulk is wished Input a positive real If a particular value of N is wished given B Input a positive real If a particular value of DO Y is wished Input a positive real If a particular value of D1 is wished Input a positive real Input a positive real Input a positive real If a particular value of D1 2d is wished If a particular value of D1 Y is wished If a particular value of D2 is wished Input a positive real If a particular value of D2 2d is wished Input a positive real If a particular value of D2 Ya is wished Input a positive real If a particular value of D3 is wished Input a positive real If a particular value of D3 2d is wished Input a positive real If a particular value of D3 V2 is wished Input a positive real If a particular value of D is wished Input a positive real If a particular value of Q is wished Input a positive real If a particular value of Q 2d is wished Input a positive real If a particular value of DO is wished Input a positive real If a particular value of DO 2d is wished Input a positive real If a particular value of a h is wished Input a positive real If a particular value of a h bulk is wished For the COmputation of DIssipative Silencers only no compulsory input data Input a positive real If a particular value of N is wished given B
122. within the range of interest See also the last paragraph of illustration 1 5 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 75 262 Effects of pressure illustration 1 5 7 Imput data a silencer is considered at test room temperature and at a pressure from 100 to 400kPa with an open area ratio of 50 the splitters having transverse solid partitions inhibiting the sound propagation along the duct axis inside the non laminated lining consisting of a single porous medium having at room temperature a flow resistivity in the direction normal to the axis of the duct oy1 48000 Nsm 4 a porosity 6 0 95 model M76 with a thickness d 0 1m No series cloth is considered no series perforated protection is considered Illustration of one of the effects see below the prediction of the propagation loss depending on the pressure see key in the graph propagation loss Da 40 35 100kPa 200kPa 400kPa A a aa P 30 E 25 gt E 20 T s 1 a a 5 z 10 Cu i 5 t n E 0 T a a T T t Porn 1 10 100 1000 10000 100000 f Hz fi 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k
123. 0 03 0 04 0 06 0 10 0 15 0 22 0 31 0 42 0 54 0 67 0 78 0 87 0 92 0 94 0 94 0 94 0 94 0 96 0 98 0 98 0 98 0 99 0 99 0 99 0 99 0 99 1 00 1 00 1 00 atmospheric back 0 64 0 64 0 64 0 64 0 64 0 65 0 65 0 66 0 67 0 69 0 72 0 76 0 80 0 84 0 88 0 92 0 94 0 96 0 96 0 97 0 98 0 98 0 99 0 99 0 99 0 99 0 99 1 00 1 00 1 00 Comment the choice of the backing influences sometimes considerably the acoustic performance of the lining at least for some frequencies This comment would also apply for the absorption coefficient for a statistic incidence Attention has to be paid to the use of results obtained with an impervious rigid back for example in an impedance tube or in a reverberant room in case of on site atmospheric back Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 163 262 Appendix to Section 2 list of symbols General Cf corresponding in Section 1 Partition x direction of highest bending stiffness ILstat insertion loss for a statistic incidence Ix size of the partition along the x direction m Iz size of the partition along the z direction m Lx length of the baffle in which the partition is symmetrically mounted along the x direction m Lz width of the baffle in which the partition
124. 0 AH58 8 Model of cut off frequency AH64 Select a model in the fco proposed list model of annular expansion R108 Select a model in the NAT 9 frequency fRokt proposed list model of HF limitation R113 Selecta model un Mig wet 9 proposed list model for Rdif R149 Select a model in the 2 proposed list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 189 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COALA E mer uae tm gode c efc th otin qoem y noter cd tere rel ph orca a pL Marinin dile rn we L A C mqueeem e BP smn mcr nmi Pn Torr spia 2 u n view Haa omini eat bhe vn gels rre n and NOL oat abad pec Model iioi cd OU N apana mei mis iis amps berger mimi m mr mg Lin grt her e Or et pim men m Lm ot E gt M Omnem Pare fn emm Titan a oc Docs lev m Cete cf b equis Dti oad D Cwngemmon ef 8 ence Cg caben tate semen les CHET YO CORE HT TOI CHIL mh Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au
125. 0 dB oct 20 It is chosen to predict the self noise of the silencer in the way described in the model referred to as 2081B 21 A roughness of 1 mm is assumed for the lining 23 Input data The input data required for the computation are listed hereafter in reference with the above data see figures in brackets in the previous used as placemarks for explaining the selection below The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA for example 1 4 2b See corresponding for example 1 4 1 Worksheet in COSIL for example 1 4 2b only Cell for Foreseen action see Item input 1 3 Input See placemark Limit set index ilim D18 Input an mteger from dd 1 7 imax Mounting m LDU AU24 Input a positive real 1 4 1 Half airway h m D25 Inputa positive real 1 AD25 i e 0 53169 Mass flow rate D37 Input a real 24 1 14 Width T D43 Input a positive real AV43 i e 1 15912 Height H m D44 Input a positive real AV 44 i e 1 15912 Length L m D45 T i Input a positive real 1 5 3 Model of by pass correction F51 Select a model in the FRO 17 for L gt 1m proposed list Roughness of lining AW61 Input a real 0 001 23 Model for the tow acoustic AW65 Select a model in the 3733B 21 power proposed list Worksheet in out CODIS2 for example 1 4 2a and for e
126. 000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 2 262 MODULE 4 prediction of acoustic performance of straight ducts either with a rectangular cross section or with a circular cross section including folded spiral seam ducts The obtained results are not comparable with standardized measurement due to the lack of documents formalizing corresponding measurement procedures MODULE 5 prediction of break out noise either of straight ducts with a rectangular cross section or with a circular cross section including folded spiral seam ducts or of silencers The obtained results are not comparable with standardized measurement due to the lack of documents formalizing corresponding measurement procedures MODULE 6 prediction of acoustic performance of bends with a rectangular cross section or with a circular cross section or with mixed cross sections The obtained results are not comparable with standardized measurement due to the lack of documents formalizing corresponding measurement procedures MODULE 7 prediction of nozzle reflection with a rectangular cross section or with a circular cross section The obtained results are not comparable with standardized measurement due to the lack of documents formalizing corresponding measurement procedu
127. 015 Worksheet in out CORED IN gt OUT o Input data Page 178 262 Item un for Foreseen action Comment input Biggest dimension a AH49 Input a positive real Smallest dimension b AH50 Input a positive real Length L AH51 Input a positive real Mass flow rate AH53 Input a positive real Model of cut off frequency AH64 Select a model in the fco proposed list Model of cross over Select a model in the i R81 frequency fcr proposed list For f fcr model of 5 Select a model in the ee R85 transmission proposed list For f gt fcr model of x Select a model in the and R90 transmission proposed list Model of minimum for Rdif R95 Select a model OD the proposed list Model of maximum for Rdif R99 Selecta model in te proposed list Model of minimum for Rdif R108 Select a modeldan the proposed list Model R131 Select a model in the proposed list Limitation of IL for HF R133 Input a positive real Limitation of Insertion Loss for High Frequency E 4 Select a model in the 1 first approach displayed in the same worksheet bs Rdif Fe proposed list 2 second approach displayed in the same worksheet Accounting IL stat 0 1 R151 Fon NO mpu Or lor YES input 1 AB154 to Re A dB m AL154 Input a positive real noda R158 Select a model in the proposed list model R164 Select a model in the proposed list Model for diffusivity factor R168 Select a model in the Kd
128. 1 6y1 from 9 to 15 kNsm 4 an extrapolation of Dr with a different thickness has been used At the time of the present user s manual the conditions of the measurement of the data pool H2 1A H3 1A are not known with accuracy especially the higher modes propagating in the duct in relation with the characteristics of the testing facility mentioned in H2 1A with a front section from 0 5m 0 5m to 1 3m 0 5m For those reasons the value obtained by the means of the unique model MUL has to be considered as a typical estimation of the reflection loss for a duct of dimensions comparable to testing facility mentioned in H2 1A when no accurate information is available regarding the higher order modes this is often the case Step I 1A This step aims at taking into account the self noise of the silencer noise produced by the airflow For dissipative silencers o Bibliography references I10 1A I11 1A o Comments the self noise acoustic power of flow noise Lw in dB ref 1E 12W is basically computed at frequency steps of 1 1 octave for the mounting of the worksheet CODIS 1A RD the determination of the self noise is done according various models as shown in the tables below model DNI DN2 NF1 NF2 2081A D 1A I3 1A source I1 1A I1 1A D 1A 9 e a Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du
129. 1 layer of cloth 1 layer of perforated sheet being presently with diameter of holes 3mm in a hexagonal array with a perforation rate of 32 96 thickness 1 5mm the rear boundary condition for the arrangement of materials of interest for the COmputation of DIssipative Silencers Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 42 262 either considered without a symmetry plane opposite to the airway side case of a lining with an impervious rigid back or considered with a symmetry plane opposite to the airway side case of a 1 2 splitter requiring sometimes for field applications a sufficiently thick rigid centre plate implicitly supposed to be added to the real construction when required despite the lack of more explicit corresponding information in the present document with an equivalence of this configuration to the previously mentioned one possible other useful arrangements of materials for other predictions to be done in relation with the COmputation of Acoustic LAyers not only in the context of COmputation of DIssipative Silencers Consequently see figure 1 10 below taking into account the present status of implementation of the software a variable from 1 to 4 number of set
130. 140 2 Acoustics Laboratory measurement of sound insulation of building elements Measurement of airborne sound insulation in terms of sound reduction index per 1 1 octave frequency band are comparable with the same standard when obtained with SILDIS by the use of a pink power spectrum for LwO in terms of the unique index Rw is comparable with the standardized measurement see standard NF EN ISO 717 1 Acoustics Rating of sound insulation in buildings and of building elements Part 1 Airborne sound insulation Step P This step being a complementary feature associated with step P aims at calculating the sound reduction index of a single leaf rectangular plane partition thin plate 0 with sound leaks allowing an extended integration of various parameters 1 plate alone such as those of set 0 regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and at the rear regardless of the selected input data Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A o Bibliography references Date 01 04 2015 Page 123 262 P1 P2 P 3 P 4 P 5 P 6 P 7
131. 2 Screenshot of worksheet in out CODISIA is example 14 4 1 some wau um ton nage TT v Are tem s i enh UMS a I mms bowi n i Li i gt eme ETETTI st 2 227 E tet 256 Liu o 21 ur 2e CET se CE Te ge ue RENE A ar DE ST eS a ae Erer hearan mom eot o v v gott na ts P Re me Ld A eborenpam t pna ra cage Po Mali omnia c dotem Fine rh ong Hr t NUT ERO ne imp gem ened Fy foequrtnn mme utes in ange equas meset il Uii e dp ei hee Med nte Te etum af Bae pump tm FED ned Ton he ges ri romain ey hri Pile Y rre Tot oth Ren genit mtn irit commen leds co d Hs Sat Pr gens rli Dm om Pel TTY mma m Fo ni rr RE Beso pens ani Me on Vers of mes yet Ma m Em Pa erm deteste carm ri n med e Co ge ml m eyes Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 104 262 Appendix to Section 1A list of symbols General f frequency Hz LwO0 sound power level without soundproofing equipment dB ref 1pW Lwl sound power level with soundproofing equipment dB ref 1pW t time s Set of materials ilim limit set index imax maximum set index amp total number
132. 25 250 500 1000 2000 4000 8000 Di dB 0 0 0 1 2 3 3 3 The flow noise Lw is as shown in the table below 6 F Hz 63 125 250 500 1000 2000 4000 8000 Lw dB 26 9 23 0 18 1 12 5 6 5 0 1 7 0 14 4 ref 1pW Note the performance of this bend may have been simulated with SILDIS If so performance would be displayed in worksheet referred to as in out COBEND a straight duct The insertion loss without flow noise Di is as shown in the table below 7 F Hz 63 125 250 500 1000 2000 4000 8000 Di dB 0 1 0 1 0 2 0 2 0 3 0 3 0 3 0 3 The flow noise Lw is assumed to be negligible 8 Note the performance of this duct may have been simulated with SILDIS If so performance would be displayed in worksheet referred to as in out COBEND The sound power spectrum upstream of the duct system is as shown in the table below 9 F Hz 63 125 250 500 1000 2000 4000 8000 Lw0 dB 64 7 51 1 38 6 31 5 26 1 20 4 22 9 24 9 ref IpW The acoustic performance of each component is predetermined and referred to as BYO17 10 BYO18 11 BYO19 12 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation
133. 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 46 262 influence of air flow The presence of airflow modifies the propagation loss the computation is done with the hypothesis of a uniform air flow supposed to not be rotational Concerning flow rates and air speeds a positive value is related to a direction of airflow equal to the direction of propagation of sound a negative value is related to a direction of airflow opposite to the direction of propagation of sound Step G This step aims at taking into account a bypass correction i e a limitation of the propagation loss in case of a length of the silencer over 1m indeed compared with the estimation obtained with an hypothesis of proportionality of the performance to the length of the silencer in order to predict an insertion loss o Bibliography references G1 G3 o Comments The bypass correction Dk in dB is basically computed at frequency steps of 1 3 octave for L lt 1m Dk 0 and for L gt 1m Dk AD 1 L with AD in dB m general case An extrapolation of the original value of AD mentioned in G1 is used for SILDIS allowing calculations in an extended range of values of oy1 for values of A d h to be pr cised on the occasion of a future revision of this user s manual Note 1 the data pool used for the determination of the original val
134. 36 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 8 262 Worksheet in out COPPA2 sss nennen eee eene nennen eene eene eese ee nenne ee eene eene eene eeie 136 2 4 Examples of computation with SILDIS sss 137 Example 2 4 0 porous medium with series cloth sese 137 Envisag d application eie e i Da ee Oe E dud Dee EE e Eire oboe note gos 137 Input datas 5 137 Screenshots of the worksheets for the example of computation 138 Example 2 4 1a single isotropic plate general method eeeenneee 139 Envisaged application inb aee beoe v dto RM A E N Rss na tent 139 Input a Gah in sen et HOD uU d nds Be t Sea ed du Bd cies 139 Screenshots of the worksheets for the example of computation 141 Example 2 4 1a single isotropic plate alternative method ssee 143 Envisaged application yh hii eed teste subi oil bok FRE Dr DE rette etie ck eth Fen ge saec en 143 Input d ta ren itte tt ettet p e EE vet seu E e suk e exe tU ave e ree dee ex et wane E 143 Screenshot
135. 5 008A Date Page 01 04 2015 57 262 Worksheets in out CODIS1 in out CODIS2 in out CORESPTR in out CORESPTL o Input data Item Cel for Foreseen action Comment input among the possible conditions of propagation in porous Select a model in the medium of set 1 for the COmputation of DIssipative Condition of propagation W182 roposed list Silencers ox1 cy1 oo ox1 oyl l ox1 6y1 var for the prop COmputation of REsonant Silencers with Pine Tree splitters only oex1 cy1 oo ox1 cy1 1 o Comments Item Cell Foreseen action Comment In case of such an alert the input value for ilim has to STOP EM a be changed such as ilim lt imax r lt rmini oxl oyl 0 In case of such an alert the flow resistance of the discouraged R50 V97 porous medium of set 1 has to be increased if results for non local absorber are wished the use of results obtained with worksheets including at least 1 alert is highly discouraged o Main displays of the results Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr total pressure loss see lines 98 to 100 Note the following equation is considered for the definition of total pressure loss coefficients Gf Gf Gp Apt Cp 0 5 p Vp 2 Gf 0 5
136. 5 10 07 04 03 with 04 04 06 08 13 18 26 37 54 78 11 1 152 202 25 5 300 31 7 30 5 28 6 260 212 158 118 92 75 64 56 51 48 46 45 Comment the existence or not of the reflection loss influences the acoustic performance of the silencer at least for some frequencies One should keep in mind that in the evaluation of the reflection loss includes the effect of higher modes with increased propagation loss in the air passage in the testing conditions used for the used data pool different on site conditions may involve different reflection loss effects Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 74 262 Effects of temperature illustration 1 5 6 Imput data a silencer is considered at test room pressure on the one hand at test room temperature and on the other hand at high temperature with an open area ratio of 50 the splitters having transverse solid partitions inhibiting the sound propagation along the duct axis inside the non laminated lining consisting of a single porous medium having at room temperature a flow resistivity in the direction normal to the axis of the duct cy1 12400 Nsm 4 a porosity 0 95 model M76 with a thickness d 0 05m No series cloth is considered no series perforated pr
137. 52 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 68 262 Screenshot of worksheet in out CODIS2 for example 1 4 2b cA COR matr mena bowed med ED Xn fno creme i het sem LE aon Tx nk andes acm praz el en aem Lath Sa a d UE Parma Cache am ipt Pe Aether oin c otn moo mn m qe mmm mind LET s at ou owe a o n M 4 tn te om o Me me LI ewe LII M Men La tlm e sem te san o e prepn NEE Loi e gerit mnn wow d Piin Prom Th nbi HT qnem mme mt omm Mos ta Hd t P C ges ne A Se je Cal M TOR Te remm m a wind peg te meglio d Merito Vina e d Pr mnt matin o cnn d As im Pen Rer ned roli Ts eid Re Cdi Pt conl t vt Brod Ro pd omite ho Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 69 262 1 5 Illustrations of effects taken into account with SILDIS Introduction The prediction of acoustic performances of dissipative silencers with the software SILDIS is founded on a scientific and technical background as presented in 1 2 of this user s manual combining various knowledges in relation with physics Some future possible us
138. 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 109 262 In case of a partition surrounded by a baffle in which the partition is symmetrically mounted the geometry used is shown in figure 2 2 Fig 2 2 For Lx Z Ix the following limitation of the input data is required Int n Lx 20000 co 464 for Lz Iz the following limitation of the input data is required Int r Lz 20000 co lt 464 where co is the speed of sound in air m s Note For Lx Z Ix resp Lz Iz the the following limitation of the input data is required for Lx resp Lz 4 500 m when co 343 3 m s 2 2 Scientific and technical background The prediction of acoustic performances of plane partitions with SILDIS is founded on a scientific and technical background in relation with o analytical models for taking into account the properties of materials and various physical phenomena useful on the occasion of the computation o measurement results for feeding some of those models and for allowing the necessary improvement through correction factors of the correlation between some calculations and on site observations In case of an atmospheric back the obtained results are comparable with the standardized measurement see NF EN ISO 140 3 Acoustics M
139. 78 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 22 262 uu 1 Meier D pen E Dx E zx uS M MM H I w M M I I Setd Set3 Set2 Setl I um jd a l l DC i i l l I x x i i 1 d ss i pre e nn om cl ER RE LER Denn acoustic structure Fig 0 3 acoustic structure lt lt lt lt The 4 poles representing the sets themselves can be represented as equivalent networks consisting of a combination of 4 poles elements such as porous media and by using an old school approach of 2 poles elements series elements such as cloths and perforated protections see figure 0 4 below i 1 1 gt porous i medium 1 E I i 1 w set 1 to 4 Fig 0 4 set 1 to 4 Mm or By using a new wave approach cloths perforated protections are 4 poles elements the quantities of corresponding series elements being set equal to 0 by the user in this case Note 2 for plane partitions the equivalent network is including 5 such 4 poles the above mentioned sets indexed from to 4 anda complementary set indexed 0 the load being either infinite in case of an impervious rigid back or the radiation impedance of air in case of an atmospheric back see figure 0 5 below Remark for the set 0 the number of identical plates only can be freely selected by the user the material and the thickness being selected by the user among
140. 81 frequency fcr proposed list Model of ratio a b X113 Selecta model Gn the proposed list Select a model in the 1 first approach displayed in the same worksheet Moneltor Rait ale proposed list 2 second approach displayed in the same worksheet Accounting IL stat 0 1 X151 FORNO nme 0 for YES input 1 m da X158 Select a model in the proposed list o Main displays of the results Tables of results and graphs for a rectangular duct 1 plate alone such as those of set 0 break in sound reduction index see lines 75 to 100 columns AA to AN Tables of results and graphs for a rectangular duct 1 steel plate alone thickness such as those of set 0 break in sound reduction index see lines 102 to 123 columns AA to AN Tables of results and graphs for a rectangular duct set 1 set 0 coupling 0 insertion loss see lines 125 to 145 columns AA to AN Tables of results for a rectangular duct TL out Rdif ILstat break in transmission loss see lines 147 to 151 columns AA to AN Tables of results for a rectangular duct Lw out break in sound power level see lines 156 to 160 columns AA to AN Tables of results for a rectangular duct Lw out break in sound power level see lines 162 to 166 columns AA to AN Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g
141. 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 26 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 27 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 28 262 Section 1 computation of silencers MODULE 1 of the software 1 1 Introduction Terms and definitions For the needs of the present user s manual the following terms and definition apply see NF EN ISO 14163 Acoustics Guidelines for noise control by silencers 1999 Silencer device reducing the acoustic transmission in a duct a pipe or an aperture without preventing the carriage of the fluid Dissipative silencer silencer attenuating the wideband sounds with a relatively low pressure loss and converting partially the acoustic energy into heat by friction on tubes having a porous or fibrous structure Resonant sile
142. AC Tables of results in case of circular cross section D longitudinal attenuation A see lines 44 to 47 columns S to AC Worksheet in out COSTDU Tables of results in case of rectangular cross section g insertion loss without self noise Di see lines 21 to 24 columns S to AD self noise Lw see lines 26 to 30 columns S to AD sound power level downstream of straight duct section see lines 32 to 36 columns S to AD Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 199 262 insertion loss with self noise Di see lines 38 to 41 columns S to AD Tables of results in case of circular cross section insertion loss without self noise Di see lines 44 to 47 columns S to AD self noise Lw see lines 49 to 53 columns S to AD sound power level downstream of straight duct section see lines 55 to 59 columns S to AD insertion loss with self noise Di see lines 61 to 64 columns S to AD 4 4 Examples of computation with SILDIS Example 4 4 1 rectangular straight duct air conditioning system Envisaged application It is wished to compute the sound power level downstream of a rectangular straight duct for room conditions temperature 17 C 1 pressure 1E5
143. Comment in case of a laminated lining the choice of the flow resistivity of the porous media influences sometimes considerably the acoustic performance of the lining at least for some frequencies In particular the choice of a flow resistivity of the porous medium for the surface layer too big compared with the optimum required as far as acoustics is concerned can even with a thickness small compared to the total thickness of the lining lead to a degradation of the performance for frequencies possibly within the range of interest This comment would also apply for the absorption coefficient for a statistic incidence See also the last paragraph of illustration 2 5 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 157 262 Effects of temperature illustration 2 5 3 Imput data a lining is considered at test room pressure on the one hand at test room temperature and on the other hand at high temperature with an impervious rigid back consisting of a single porous medium having at room temperature a flow resistivity in the direction normal to its surface cy1 12400 Nsm 4 a porosity 6 0 95 model M76 with a thickness d 0 05m No series cloth is considered no series perforated protection is
144. Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 14 262 8 2 2 Acoustics regarding the longitudinal noise propagation i e for the computation of the sound power level downstream of the duct system sssesssssesseeeeeeereeneeen nennen nme nene 239 Bloc diagramme eee Her ae eee ied e Fo ERO RE ee Ri e ib Pre PIC Rie nes 240 Steps of the computation I 240 Step BAA sound power level downstream eeeeeseeeeeeeeeeereen nennen nennen neret 240 Step BAB sound pressure level downstream at a specified distance 240 8 2 3 Acoustics regarding the transverse noise propagation i e for the computation of the sound power level transmitted by the walls of the duct system ssssssssssseeeeenreenneenre 240 Bloc diagram ER EEE EU tui e ds 240 Steps of the computation ss 241 Step BAC sound pressure level at a specified distance eeeeee 241 8 3 How to use SILDIS ect tor eb RE eer RUP crure Pug Lom be P Iveco ecc 241 Operating conditions security level safety_ 241 Worksheets regarding the longitudinal noise propagation i e for t
145. Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 261 262 Screenshots of the worksheets for the example of computation Worksheet in out COSOD ESE LJ The nm ute LM MES m Fr t ne i simi pl eer m d te J F4 v NECS een lt uum p B neco HE qot s va qr BE a SEE c Wwe s D L 5 w LL 1 i 8 I i I H I i ss d i ESELI EH FERETI ee a 7 a mo e E ae e m Ls C 5 Se CE DEA HELIN TOTTI m LAON ORO FA Im m meea pomo rtm m nm m L Ll as esmee 9B 99 99 99 9 49 9 ee SS m oum rom Li u lt Rabe RE tions mn a canin cmt sem em fo LL dE oc pa NN eee si Rd es ee JP A rn om n me me 2 gt w 1 g om a an Vw LS 9 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 262 262 Appendix to Section 9
146. Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 78 262 Effects of the velocity of air flow other than regenerated noise illustration 1 5 10 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters having no transverse solid partitions inhibiting the sound propagation along the duct axis inside the non laminated lining consisting of a single porous medium homogeneous in directions parallel to and perpendicular to its surface having at room temperature a flow resistivity in the direction normal to the axis of the duct cy1 15kNsm 4 a porosity g 0 95 model M76 with a thickness d 0 1m and a length L 2m No series cloth is considered no series perforated protection is considered Illustration of one of the effects see below the prediction of the longitudinal propagation depending on the mean flow velocity in the airways see key in the graph longitudinal attenuation Da L 70 v 0 ms 1 a v 10ms 1 V 20ms 1 DT n B g EET zl 30 8 n 20 s 8 amp 10 7 n a n 0 T x m E T T rers D 1 10 100 1000 10000 100000 f Hz fi 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k
147. Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 177 262 Note a partly common background is required for several steps of the computation schemes of different acoustic components insertion loss of a silencer absorption coefficient sound reduction index of a plane partition sound reduction index of a duct wall For this reason worksheets in COALA and in COSIL are distinct due to the existence of other calculations by the means of SILDIS using the routine COALA COmputation of Acoustic LAyers but not using the routine COSIL COmputation of SILencers Worksheet Suitable for mountings Input data Results in COALA all for sets for reference spectrum in out CORED IN gt OUT REctangular Duct break for duct dimensions flow rate out transmission REctangular Duct break in in out CORED OUT gt IN transmission in out COCID IN gt OUT CIrcular Duct break out for duct dimensions flow rate indicators of performance acoustics transmission in out COCID OUT gt IN CIrcular Duct break in transmission Input data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with o theinput data See corresponding in the chapter General considerations As far as plates to which the layer of mat
148. General considerations o some alerts in case of input data involving a warning of the user o the place where and the way some results are presented Those key points are reviewed worksheet per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 224 262 Worksheet in out COBEND o Input data Cell for Item A Foreseen action Comment input mass flow rate Qm kg s 15 Input a real model of cut off frequency N5 Select a model in the fco proposed list EARE Select a model in the model of 90 bend type S5 proposed list adimensional bend radius X5 Input a positive real model of self noise ACS Select a model in the proposed list Only in case of rectangular inlet cross section amp rectangular outlet cross section Item cal for Foreseen action Comment input biggest dimension al m H23 Input a positive real smallest dimension b1 m H24 Input a positive real biggest dimension a2 m P23 Input a positive real smallest dimension b2 m P24 Input a positive real
149. H en 172 Step AH sound reduction index of a single leaf circularr duct ssssseeseeeeeeennenn 172 Step AH sound reduction index of a single leaf circular duct 173 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au M T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr ont d Or Report Date Page PhR15 008A 01 04 2015 10 262 Step AJ insertion loss of set 1 when compared to set 0 173 Step AK transmission loss with sound leaks 174 Step AL break out sound power level nnne 174 3 2 2 2 b Acoustics circular ducts break in noise 175 Bloc diagram for circular duct walls break in noise 175 Steps of the computation for circular duct walls break in noise 175 MisicHESEOUNSENECM Un 175 Preliminary remarks common to step AP and step AQ sssseeem 175 Step AP sound reduction index of a single leaf circular duct 175 Step AQ sound reduction index of a single leaf circular duct 176 3 3 How To use SIDADIS icto titre ttiam eene didis aad 176 Operating conditions
150. IT 230 Step AAA FloW NOISE iere titre ERR SR ORE ee EE ENE XE ALS NA UA Y SERA ex Poeta E 231 Step AAB insertion loss with flow noise 231 7 3 How to use SILDIS side 231 Operating conditions security level safety 231 M orEshe ets eisciceeec a e pee secs epe e aae iata eeu dep ee etta ase docs Gabeaices sane dacs dabedees tase dees tabesees need 231 Input data alerts and results the key points 232 7 4 Examples of computation with SILDIS sse 233 Example 7 4 1 circular mouth seen 233 Envisaged application tede ren drea p y n ER Cagnat ape te Ry e eR Rudd 233 lide eS Fe SRE eda I E E en den EE EE needs 233 Screenshots of the worksheets for the example of computation 234 Appendix to Section 7 list of symbols sse 236 Section 8 computation of sound impact of a duct system MODULE 8 of the software 8 1 Introduction em 239 Terms and definitions ocine e ore HH eR ee 239 Mountings and geometry 9 ptt a ie te bo dole ie 239 8 2 Scientific and technical background sss 239 8 2 1 Thermodynamics and fluid dynamics esesseeeeeeeeeeeeneen eene nere nere 239 Steps of the computation se 239 Isolation Technologie Services SARL au capital de 7000
151. Isolation Technologie Services Report PhR15 008A acoustique User s manual for the software SILDIS Sound Impact Limitation Design for Industrialized Solutions Revised by Philippe Reynaud on April 2015 the Ist philippe reynaud Q its acoustique fr bibliography intentionally left blank Abstract The prediction of performances of products and construction systems for noise control engineering often requires an approach whose nature is computationally intensive making its application difficult for most acoustics practitioners The software SILDIS has been developed in order to make possible such a prediction without any computational effort from users by the means of a single PC tool appropriate for a wide range of industrial engineering purposes Regarding the multi disciplinary scientific and technical background suitable approaches of all times able to be included in the general layout of the program have been selected and encapsulated in a easy to use Excel based software using drop down menus and providing results in tabular and graphical form French or English language with comprehensive input output data on a unique printable simulation report Almost all acoustics calculations are performed at single frequencies and displayed per 1 3 and or 1 1 octave band global values with respect to a chosen reference spectrum are computed whenever it makes sense MODULE 1 prediction of acoustic and aerodynamic performance of si
152. Item bows ig Foreseen action Input See placemark input comment Temperature D6 Input a real number 17 1 Pressure D7 Input a real positive 100000 2 number Reference acoustic power D65 to ones 73 6 61 3 45 7 42 1 9 spectrum K65 P i 38 4 36 1 38 8 33 9 Worksheet in out COEDLA Item Cell t r Foreseen action Input See placemark input comment mass flow rate Qm kg s 15 Input a real model of cut off frequency Select a model in the E PS fco proposed list Only in case of a circular cross section Item Cell f r Foreseen action Input See placemark input comment diameter m P47 Input a real 0 250 5 model of attenuation P57 ue Ho ee 2081 C 8 proposed list Worksheet in out COSTDU Item Cell tor Foreseen action Input See placemark input comment mass flow rate Qm kg s I5 Input a real 1400 3600 110 7 model of cut off frequency N5 Select a model in the HAN fco proposed list model of insertion loss S5 Selecta model ques COEDLA proposed list duct length m X5 Input a real J 6 TP Select a model in the model of self noise ACS 2081B 8 proposed list model of spectral correction ACIO Select a au in the 2081 8 proposed list Only in case of a circular cross section Item Cell for Foreseen action Input See placemark input comment diameter m P47 Input a real 0 250 5 Isolation
153. Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 92 262 model 2081B 2081R 2081C1 MUN VER 14 1 A I5 1A I5 1A I8 1A I9 1A Source eem eem eem men B dB and m are input data with an additional correction for temperature with an additional correction for pressure for the models 2081 and 3733 a spectral correction is used according various models as shown in the tables below model 2081 FRO 3733 source I5 1A I1 1 1A U7 1A Warning at the time of the writing of this manual all the consequences of the choice of one or the other model are not known with accuracy The choice of the model can be done by the user allowing tests and feed back Step J 1A This step aims at calculating the insertion loss without taking into account the self noise o Bibliography references JI IA o Comments The insertion loss without taking into account the self noise Di in dB is computed at frequency steps of 1 3 octave then calculated per 1 1 octave frequency band for a reference acoustic power spectrum Lw in dB ref 1E 12W Di Da L Dk Dr Step K 1A This step aims at calculating the insertion loss of the silencer including its self noise o Bibliography re
154. RR Mate niet ee Pes belegen 63 Input d t e eee Rte teet te e eet esta tete gate ted e ee ted eo 63 Screenshots of the worksheets for the example of computation see 64 Example 1 4 2b dissipative silencer with a circular cross section ssssssss 66 Envisaged application 20 550 uitio I rre RR e b t ede a 66 Input data un Rene hdi d dM 66 Screenshots of the worksheets for the example of computation 67 1 5 Illustrations of effects taken into account with SILDIS 69 LL M 69 Effects of the properties of a porous medium in a non laminated lining sees 69 Effects of the properties of porous media in a laminated lining 70 Effects of the conditions of propagation of sound inside the lining 71 Effects of the limitation of the propagation loss 72 Effects of the reflection 1OSS ccccccceccccccccsccessssecccccscceeseeccccssseeeeseeececcssseuuesecsesssseuesseecsesssseuueeeescessseues 73 Effects of temperature ee eee pepe pea ed E ie Dn eie Peter 74 Effects of pressure 5 2 onn iD ROREM ERE IH IER TEE E EN ne S 75 lOi 24 ROSE IANLRM UI NER E PO w cmm 76 Effects of a serie
155. Room dimension according y axis Input a real number Room dimension according z axis Input a real number Solid angle calculation point coordinate according x axis Input a real number Solid angle calculation point coordinate according y axis Input a real number Solid angle calculation point coordinate according z axis Input a real number Source height Input a real number For model KUT only Input a real number For model ISO only Input a real number Input a real number In 1E 3 Neper per meter Input a real number Input a real number Sabine s coefficient for partitions couples x y amp z Input a real number Input a real number Input a real number For NO input 0 for YES input 1 If NO is entered Sabine s coefficient will be used for the simulation Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 259 262 0 1 i Variance model C132 Select a model For general model KUT only Inhomogeneity model EIS Select a model For general model KUT only SC URS formula QU G132 For NO input 0 for YES For general model NIJ only each direction 0 1 K134 input 1 For gen
156. Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 159 262 Effects of a series cloth illustration 2 5 5 Imput data a lining is considered at test room pressure and temperature with an impervious rigid back consisting of a single porous medium homogeneous in directions parallel to and perpendicular to its surface having a flow resistivity cy 22332Nsm 4 a porosity 6 0 95 model M76 with a thickness d 0 05m The cloth consists of an impervious membrane surface density 125 g m2 Illustration of the effect see below the prediction of the absorption coefficient at normal incidence without and with the cloth absorption coefficient at normal incidence alpha0 1 20 e without 1 00 0 80 o 0 60 2 rj 0 40 0 20 0 00 1 10 100 1000 10000 100000 f Hz f1 3oct Hz 25 315 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k without 0 00 0 01 0 01 0 01 0 02 0 04 0 05 0 08 0 13 0 19 0 27 0 38 0 51 0 65 0 77 0 87 0 93 0 96 0 96 0 95 0 95 0 96 0 98 0 99 0 99 0 99 0 99 1 00 1 00 1 00 with O00 0 01 001 0 01 0 02 004 0 06 009 0 14 O22 034 05 073 093 099 0 89 0 72 055 042 032 022 0 13 008 0 05 0 03 0 02 0 01 OO 0 00 0 00 Comment the choice of a series cloth influences sometimes considerably the acoustic performance of the
157. Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 245 262 Worksheet in COALA Item Foreseen action Input See placemark comment Temperature Input a real number 17 1 Te Input a real positive 100000 2 number Reference acoustic power Input numbers 64 7 51 1 38 6 31 5 9 spectr um 26 1 20 4 22 9 24 9 Worksheet in out IDS page 1 Cell for 2 Foreseen action input Item Input See placemark comment Noise source Input a string Configuration Input a string GSA type Input a string cylindrical attenuator Component Input a string without core resp bend resp straight duct 10 11 12 if not predetermined but Matrix Select a model in the BYOI7 resp BYO18 computed with SILDIS proposed list resp BYO19 the selection should have been CODIS2 resp COBEND resp COSTDU Lwiref dB ref IpW Input a real Directivity index dB Input a real Lplcalc Lwlcalc DI dB Input a real Lplref dB ref 1pW Input a real Comments Input a string In case of use of models BYO17 to BYO19 only Item uaa Foreseen action Input See placemark input co
158. Ts a d FES ble T LI re m m ma hofu re MX Ail D oz EI 1 ai DS di Cpe one d nee Laer ot Pa Li cat BE Pa med TRO at agde mcum tre s eng Reemi mati w Tant mm fa pum go z 1 SR I dee tet Es RR m 3 inet www Hu Mn PAS eee 3 ee ee mm uow as mm m he meret pont enm mon ites rod como Lon onde Rom pes 1 pete enne Pd d pm eme Eee ow 2 L dpt nt n gt o Be oen hn ti non Ln Eer rare D PEED L 312a x ss e t 4 Phemepn as be i ui uu 2 mi Donya Maut e es Nr Seda Ge PT e ixi T T prs wm me r en ane I LJ LT CIT A C NR ie EEE ed D T wos Lw Iw I T I I I 4 I w Orns WE 1 E IMG Wl WI 1 WOMIT WII Wi secs mcs to OR EE CORR EE Po Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 102 262 Screenshot of worksheet in COSIL 1A for example 14 4 1 i CHE I eu Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 103 26
159. a Lares a dd mead ws Ba mtd haan irt arie LP Example 2 4 6 orthotropic plate Envisaged application It is foreseen to compute the engineering constants for a cladding 55 consisting of an aluminium plate 56 of thickness 1mm 57 with an overall thickness 30 mm 58 with a periodic length 12300 mm 59 with lengths of the corrugation T b 100mm 60 The model HAN 61 is considered Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Worksheet in out COORT for example 2 4 6 Page 154 262 Item See placemark Reference of base plate Thickness Model of orthotropic plate hw 1 T Model of bending stiffness maximum Model of bending stiffness minimum Foreseen action Input comment Select a reference of layer in the proposed list for ALU 56 each layer of interest Input a real positive 0 001 57 number Select a model in the pr
160. a3 1A source using a using a regression regression limiting 173 15 to 20 to 800 temperature 926 85 C C Conversion J cal factors J 1 0 2388 cal 4 1868 1 when used the diffusivity of dry air ais computed from a1 Note a A plep when used the Prandtl number of dry air Pr is computed according various models as shown in the table below int caseo MEC MEC2 KRA model for cp a1 1A from PIIN a3 1A source Ho using a from n Cp Tb Cp regression and X limiting 73 15 to 173 15 to 20 to 800 temperature 926 85 C 926 85 C Note Pr v a n p a n c when used the adiabatic sound velocity in dry air cis computed from a5 1A Note c Kp when used the characteristic impedance of dry air Zis computed from al 1A Note Z pc Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 89 262 1A 2 2 Acoustics e Bloc diagram for rectangular dissipative silencers the computation scheme for rectangular dissipative silencers is as shown on fig 1A 3 below beck A a rece n pre nies vit fup estore epeiaxe E A pepe oue wa coa O14 T4 imt preta teea JD 14 be ons setze love vihad sef rene j A fecun W ast naice K
161. able with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss a safety factor has to be used by the user for taking into account the inhomogeneity of the inflow see 02 0 5 leading to predictions lower than on site values 1 3 How to use SILDIS Operating conditions security level safety See corresponding in the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for which input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used in COALA E13 J37 ont Inti BRE ME in COSIL D25 BD25 D37 D43 D44 D45 attention has to be paid to the fact that the considered in out COPPA X53 X54 sheet is not included in the worksheets listed below Worksheets Regarding the COmputation of DIssipative Silencers the software SILDIS is configurated in order to allow the user to access to 4 worksheets being linked as shown in fig 1 14 the overview of the worksheets being shown in table below in out CORESPTL l e in out CORESPTR e in COALA ia COSIL e m out CODISI gt in out CODIS2 Fig 1 14 Note a partly common background is required
162. ables below model 2081 FRO 3733 source 15 I11 I7 Warning at the time of the writing of this manual all the consequences of the choice of one or the other model are not known with accuracy The choice of the model can be done by the user allowing tests and feed back For resonators o Bibliography references 12 o Comments the self noise acoustic power of flow noise Lw in dB ref IE 12W is basically computed at frequency steps of 1 1 octave for the mountings RPTR RPTR RPTL RPTL the determination of the self noise is done according various models as shown in the tables below model FRO source 112 for the model FRO a spectral correction is used according various models as shown in the tables below model 2081 FRO 3733 source 15 I11 I7 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 49 262 Step J This step aims at calculating the insertion loss without taking into account the self noise o Bibliography references 1 o Comments The insertion loss without taking into account the self noise Di in dB is computed at frequency steps of 1 3 octa
163. acoustique fr Report Date Page PhR15 008A 01 04 2015 198 262 Only in case of a rectangular cross section Item dd fo Foreseen action Comment input biggest dimension m P23 Input a real smallest dimension m P24 Input a real model of attenuation P32 Select a me Gane proposed list Only in case of a circular cross section Item Cell tor Foreseen action Comment input diameter m P47 Input a real model of attenuation B57 Select a model im ihe proposed list Worksheet in out COSTDU o Input data Item cet tor Foreseen action Comment input mass flow rate Qm kg s 15 Input a real model of cut off frequency Select a model in the N5 fco proposed list model of insertion loss S5 PE Hood in the proposed list duct length m X5 Input a real model of self noise ACS Seles modal ome proposed list model of spectral correction AC10 Select a model Gia the roposed list Only in case of a rectangular cross section Item ca for Foreseen action Comment input biggest dimension m P23 Input a real smallest dimension m P24 Input a real Only in case of a circular cross section Item Cell Tor Foreseen action Comment input diameter m P47 Input a real o Main displays of the results Worksheet in out COEDLA Table of results in case of rectangular cross section longitudinal attenuation A see lines 21 to 24 columns S to
164. acoustique fr Report Date Page PhR15 008A 01 04 2015 204 262 Screenshot of worksheet in out COSTDU ve on ins TO ee EE dim BEEN oe c nn to ll vi itt LL LESE nam ani atii db a sou tee asi DCE Duns iid UA DR i RE gi d yu Example 4 4 3 circular straight duct exhaust stack Envisaged application It is wished to compute the sound power level at the mouth of a circular stack for service conditions temperature 109 85 C 1 pressure 1E5 Pa 2 The duct is with a diameter D 6 m 3 The height of the stack is 135 m 4 The flow rate is 384 615 kg s 5 Regarding models of computation the procedures basing the model referred to as 3733G are selected 6 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA Item Cell for Foreseen action Input See placemark input comment Temperature Input a real number 109 85 1 Pressuie Input a real positive 100000 2 number Worksheet in out COSTDU Item Cell for Foreseen action Input See placemark input comment mass flow rate Qm kg s Input a real 384 615 5 model of cut off frequency Select a model in the fco proposed list model of
165. action Comment input Insertion loss without flow E135 to noise dB M137 Input a real Bring Your Own input data Flow noise dB pec Input a real Bring Your Own input data o Main displays of the results Tables of results for components sound power level downstream of components Lw1 see lines 50 to 62 columns B to O Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 243 262 insertion loss with self noise Di see lines 64 to 76 columns B to O Tables of results for full duct system sound power level downstream of duct system Lwl1calc see lines 78 to 82 columns B to O sound pressure level downstream of duct system Lpl1calc at a specified distance see lines 97 to 101 columns B to O Worksheets regarding the transverse noise propagation i e for the computation of the sound power level transmitted by the walls of the duct system Regarding the computation of IMPACT the software SILDIS 1s configurated in order to allow the user to access to various worksheets being linked as shown in fig IDS 4 the overview of the worksheets being shown in table below in out COBON in out IDS page 2 Fig IDS 4 Note temperature and pressure conditions as well as refe
166. al 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date PhR15 008A 01 04 2015 Worksheet Cells x B s in COALA E13 J37 W38 isi cna ll in CODAP W23 in out COPPA X53 X54 Worksheets Page 212 262 attention has to be paid to the fact that the considered sheet is not included in the worksheets listed below Regarding the COmputation of Break Out Noise the software SILDIS is configurated in order to allow the user to access to various worksheets being linked as shown in fig 5 21 the overview of the worksheets being shown in table below iinom COPPA jin oet COORT Le in out COPPAI em out CODAP fin COALA id in out COPPA jin owt COPERF bn out CORED IN gt OLT es out COCID IN OUT e in owt COBON lin vet CODISI in oet CODIS2 gt Fig 5 2 in CODIS fin ot CORESPTRI m out CORESPTL gt Worksheet Suitable for mountings Input data Results in out CORED IN gt OUT Rectangular duct for duct dimensions for some models longitudinal sound attenuation as well indicators of performance acoustics in out COCID IN gt OUT Circular duct for duct dimensions for some models longitudinal sound attenuation as well indicators of performance acoustics in out COBON
167. and density of dry air Kerr adiabatic bulk modulus Pa RG bulk density kg m Za characteristic impedance Nsm Zan normalized characteristic impedance a a exponents for the expression of Dan p B exponents for the expression of Zan Qv high frequency limit of the tortuosity Ta propagation constant rad m Pan normalized propagation constant Ta propagation constant in the x direction rad m Tay propagation constant in the y direction rad m A thermal characteristic length m viscous characteristic length m Perr effective density kg m Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 82 262 open porosity o static air flow resistivity specific flow resistance Nsm olx static air flow resistivity in the x direction for porous medium of set 1 Nsm oly static air flow resistivity in the y direction for porous medium of set 1 Nsm Note subscript i for set i except for olx and oly Cloths d thickness m M surface density kg m R superficial flow resistance Nsm Rp parallel resistance losses due to mounting Nsm Note subscript i for set i Perforated protections a diameter of
168. arman bejh COTES ar white rejet mt se tren me pesem ae OER SORTENT A Vergy edhe Ope Vent ovTat bbc magie De peer we iad 9 CECI POESIE te mae te sone qa model IE rm lind eom mat m md mi del OOK Wists konnte apre nono AA ICE s uemodd STE KM pa wi Lu rg dem mai oon on mpi Prem m asl NI w ai gov Loy 20e pe te sme e etit ng it M Umate an ot Pont P8 mm p eese v Unda 950 inae Oum Dedi eem Compaan d ir Cum mae bee pesses der SOO VE T D CORE UIT IN CORE a Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 61 262 Screenshot of worksheet in COSIL for example 1 4 1 pe ec ee s NEL LL 4 Es gt AM Der d ms DOM i Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 62 262 Screenshot of worksheet
169. at the rear regardless of the corresponding input data o Bibliography references see corresponding of step T o Comments see corresponding of step T To be continued Step U This steps aims at calculating the insertion loss for coupling 0 with sound leaks o Comments The insertion loss derived by the means of the present step is referred to as IL stat IL stat is not the insertion loss of the total acoustic structure IL stat R stat R stat where R stat is the sound reduction index of 1 plate alone such as those of set 0 regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and at the rear regardless of the selected input data To be continued Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 129 262 Step V This steps aims at calculating the sound reduction index for coupling 100 with sound leaks o Bibliography references See corresponding of step T o Comments The sound reduction index derived by the means of the present step is referred to as R stat o Remarks in relation with the angular integration in case of use of the model INT see correspon
170. c closed foil according according to C3 to C3 Rs Nsm free input co Rp Nsm 0 0 M kg m2 free input free input Note no influence of the speed of the airflow is taken into account for the computation Conversion MKS Rayl CGS units factors Nsm MKS Rayl 1 107 Nsm CGS units 10 1 Step D This step aims at taking into account series perforated protections used in the acoustic structure Fig 1 8 series perforated protection o Bibliography references D1 D2 D3 D5 D6 D8 D9 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Comments E Date 01 04 2015 Page 40 262 depending on the used general model some of the following parameters are taken into account in relation with the properties of a perforated protection d m diameter of the holes width of the slits t m thickness open area ratio depending on the used general model various effects are or are not taken into account general model DYM L C MOI ICH d d d d parameters t t t t source D1 D2 D3 D4 D3 D4 D5 comment general in contact with air only holes cir
171. cer being not equal to the area of the overall section of the silencer overall width overall height Q 1 100mm 17 but being equal to the inner width length L 1500mm 3 having a lining of thickness d such as d d 12100mm 5 made of one 7 homogeneous in directions parallel to and perpendicular to its surface bulk absorber 8 having the reference DEMO in the database for porous media of SILDIS 9 with 10 a cloth of thickness d 125 100 mm 11 having the reference DEMO in the series cloths database of SILDIS 12 without perforated protection 13 It is foreseen to use the silencer with an air flow rate of 24 1 kg s 14 at 20 C 15 at a pressure of 101325 Pa 16 It is decided to take into account a limitation of the propagation loss for L gt 1m 17 The reference spectrum is supposed of the type pink noise 19 with a sound power level of 130 dB oct 20 It is chosen to predict the self noise of the silencer in the way described with the model referred to as 2081B 21 A roughness of 1 mm is assumed for the lining 23 Input data The input data required for the computation are listed hereafter in reference with the above data see figures in brackets in the previous used as placemarks for explaining the selection below The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA for example 1 4 2a See corresponding fo
172. ces SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 142 262 Screenshot of worksheet in out COPPA for example 2 4 1a only ne CURE D me a a mn 0 5 TE cae Seba I sn eee me me ce mE Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 143 262 Example 2 4 1b single isotropic plate alternative method Envisaged application It is foreseen to use the following conditions temperature 20 C 15 pressure 101325 Pa 16 The reference spectrum is supposed of the type pink noise 19 with a sound power level of 130 dB oct 20 It is wished to compute the sound reduction index with an atmospheric back 24 of 1 25 aluminium plate 26 of thickness 2mm 27 the intrinsic losses of the material being considered 28 with a infinite extend 29 and by an integration of the transmission factor between 0 and 90 30 No sound leak is considered 31 Input data The input data required for the computation
173. coustic structure consists of elements for which the selected quantity is not 0 belonging to sets 0 to imax Remark for the set 0 the number of identical plates only can be freely selected by the user the material and the thickness being selected by the user among those of the plate s of the set 1 or of the set 2 Equivalent network The general equivalent circuit considered for the purposes of the routine COALA COmputation of Acoustic LAyers common to the COmputation of Dissipative Silencers CODIS and to the COmputation of Plane PArtitions COPPA with the software SILDIS is as shown on the figure 0 2 below with Pi sound pressure of the incident wave Zis internal source impedance Zr radiation impedance Fig 0 2 N H eee source acoustic structure load M A 4 The source represents the acoustic field present in the upstream atmosphere impinging on the acoustic structure The unique 4 poles representing the acoustic structure itself can be represented as an equivalent network including several 4 poles Note 1 for dissipative silencers the equivalent network is including 4 such 4 poles the above mentioned sets indexed from 1 to 4 the load being infinite in case of an impervious rigid back see figure 0 3 below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 4
174. cted as shown in the table below model HAL MIC AJ1 AJ1 source HAL HAL MIC MICh e elsen Step AK This step aims at calculating the transmission loss with sound leaks with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references No particular bibliography has been considered o Comments if IL stat is accounted TL out R dif IL stat else TL out R dif the model for Rdif is selected as shown in the table below model 1 2 cf step cf step source AH AH Step AL This step aims at calculating the break out sound power level with atmosphere at the front and at the rear regardless of the selected input data First approach o Bibliography references AL AL2 o Comments the model for TL out is selected as shown in the table below model 2081 HAN ASH source AL AL2 AL2 the correction factor to account for gradually decreasing values of the sound power level inside the duct as the distance from the sound source increases only accounts the sound attenuation A dB m due to internal ductwork losses which is entered in worksheet in out COCID IN gt OUT Second approach o Bibliography references AL3 ALA Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre
175. cular only square array only in contact with air only holes circular only square array only in contact with a porous layer at the front and or at the rear with various geometries in contact with a porous layer at the front and or at the rear with various geometries comment regarding the calculation of impedances total impedance calculated as the sum of the impedance at the rear using appropriate effective density tunnel impedance impedance at the front rear using appropriate effective density total impedance calculated using appropriate effective density accounting interactions at rear and at front comment regarding the porous layer at the rear and at the front other comment even if of set index lt imax even if of thickness zero the nature of the porous layer at the rear and at the front is accounted MOI and ICH seems to provide identical results in case of a perforated sheet with round holes and in case of the use of the simplified model for the tunnel model MOI and in case of input data for the model MOI with tortuosity 1 and characteristic length appropriate even if of set index lt imax even if of thickness zero the nature of the porous layer at the rear and at the front is accounted with the general model MOI the effects of the interaction of the perforated protection with a porous layer are taken into account by the means of
176. cular bend seen 225 Envisaged application see 225 Input data rien en IR erede aoo in etenim ets 225 Screenshots of the worksheets for the example of computation see 225 Appendix to Section 6 list of symbols sse 228 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 13 262 Section 7 computation of nozzle reflection MODULE 7 of the software 7 1 Introduction 1 1 G G sseeeeeetetnttetn tnter tette teet 230 Terms UE SIDOUITSERENET 230 Mountings and geometry 230 7 2 Scientific and technical background 1 sss 230 7 2 1 Thermodynamics and fluid dynamics seesssssssssssseeeeeeeneren nee 230 Steps of the computation scene ese eee ee nere tee E HEC PEE aes 230 EE IR E 230 Bloc diagram M S Steps of the computations Lens E E E E D do DU Step AZ insertion us vithonf flown Dc
177. d list Select a model in the proposed list Select a model in the proposed list Select a model in the proposed list Input a positive real Select a model in the proposed list For the COmputation of DIssipative Silencers with mountings RD Input a positive real Input a positive real For the COmputation of DIssipative Silencers with mountings RD Select a model in the proposed list Used for the interpolation of a ponderation curve generally of secondary importance Select a model in the proposed list For the COmputation of DIssipative Silencers only some data of the table above may not be modifiable by the user despite the displayed color of the cell Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 98 262 Worksheets in out CODIS 1A o Input data Item pong Foreseen action Comment among the possible conditions of propagation in porous Condition of propagation SS Select a model in u medium of set 1 for the COmputation of DIssipative propag roposed list p p prop Silencers ox1 cy1 o ox1 oyl 1 oxl oyl var o Comments some data of the table above may not be modifiable by the u
178. d on results as mentioned above and detailed below given to them by the software that are hopefully not of that kind in case of doubt please ask Operating conditions security level safety SILDIS is a PC program requiring the use of Excel 2010 or a more recent version The best operating conditions have been obtained with a computer whose technical characteristic are as follows Intel Core i7 3920XM CPU 2 9 GHz 3 10 GHz 32 Go of RAM SILDIS is a program with a restricted access see report PhRxx 014x Procedure for the use of Excel based programs with a restricted access General layout of the program The general layout of the program SILDIS is as shown on fig 0 1a amp fig 0 1b below cf appendix for abbreviations Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 18 262 m n 00000 L 00 p m Poona 1I r wom dac OO 0n I r r p pecon H v Conti af j Conte a T mm nonu yo me consseye _ ree wom peat CORESPTHI pa coaira T r p 4 Hs cet COPERS t Compain ar 3 Pie Pansion m
179. data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with o the input data See corresponding in the chapter General considerations o some alerts in case of input data involving a warning of the user o the place where and the way some results are presented Those key points are reviewed worksheet per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in out IDS page 1 o Input data Item ien d Foreseen action Comment input Noise source L3 Input a string Configuration L5 Input a string GSA General Silencing Arrangement Cf appendix GSA 9t Li Input a st type T put a string GSAC EX Component C25 to C34 Input a string Matrix D25to Select a model in the D34 proposed list s ETT If no input in N88 resp O88 displayed value is Petia rete Fos Input a teal computed from 1 1 octave bends input data T E95 to Directivity index dB M95 Input a real Lplcalc Lwlcalc DI dB N97 Input a real E107 to If no input in N107 resp O107 displayed value is Lptret dB ref 1pW 0107 Taput a real computed from 1 1 octave bends input data C113 to Comments c12 Input a string In case of use of models BYO17 to BYO19 only Item un d Foreseen
180. de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 90 262 o Bibliography references AI 1A o Comments No comment Step G 1A This step aims at taking into account a bypass correction i e a limitation of the propagation loss in case of a length of the silencer over 1m indeed compared with the estimation obtained with an hypothesis of proportionality of the performance to the length of the silencer in order to predict an insertion loss o Bibliography references G1 1A G2 1A G3 1A o Comments The bypass correction Dk in dB is basically computed at frequency steps of 1 3 octave for LxIm Dk 0 and for L gt 1m Dk AD 1 L with AD in dB m general case An extrapolation of the original value of AD mentioned in G1 1A is used for SILDIS allowing calculations in an extended range of values of oy1 for values of A d h to be pr cised on the occasion of a future revision of this user s manual Note 1 the data pool used for the determination of the original value of AD mentioned in G1 1A is related to splitters filled with 1 porous medium with a flow resistivity ox1 oy1 from 9 to 15 kNsm no influence of the speed of the airflow seems to be taken into account for th
181. ding of step P o Remarks in relation with the displayed results see corresponding of step P To be continued Step W This steps aims at calculating the sound reduction index with connections with sound leaks 2 leaves o Bibliography references See corresponding of step T o Comments The sound reduction index derived by the means of the present step is referred to as R stat o Remarks in relation with the angular integration in case of use of the model INT see corresponding at step P o Remarks in relation with the displayed results see corresponding at step P To be continued 2 3 How to use SILDIS Operating conditions security level safety See corresponding in the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for witch input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used Worksheet Cells n PAETOS in COALA E13 J37 W39 something like that in out CODAP W23 in out COPPA X53 X54 Worksheets Regarding the COomputation of Plane Partitions the software SILDIS is configurated in order to allow the user to access to 4 worksheets being linked as shown in fig 2 11 the overview of the worksheets being shown in table below Isolation Technologie Services SARL au capital de 7000 Eu
182. ding self noise Lw1 versus frequency see lines 164 to 184 columns A to F per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum insertion loss with flow without self noise Di and insertion loss with flow and self noise Di versus frequency see lines 164 to 184 columns G to L per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum 1 4 Examples of computation with SILDIS Example 1 4 1 dissipative silencer with a rectangular cross section Envisaged application It is wished to compute the acoustic and aerodynamic performances of a dissipative silencer with a rectangular cross section width B 1200mm 1 height H 2000mm 2 length L 1500mm 3 having rectangular edged 4 splitters of thickness 2d such as 2d 2d 1 200mm 5 with a open area ratio of 50 6 made of one 7 homogeneous in directions parallel to and perpendicular to its surface bulk absorber 8 having the reference DEMO in the database for porous media of SILDIS 9 with 10 a cloth of thickness d 1 5 100 mm 11 having the reference DEMO in the series cloths database of SILDIS 12 without perforated protection 13 It is foreseen to use the silencer with an air flow rate of 24 1 kg s 14 at 20 C 15 at a pressure of 101325 Pa 16 It is decided to take into account a limitation of the propagation loss for L gt 1m 17 and to
183. dm tram amighert d daaar vey mean Sar tame tee Wem Eee i 8 CF hoe os ee 1 Tn I ie Lie Ts a vee noc h side fi EE PEATE ERU WE ips Women enia in TE eww i equi Rr ceca bakes Oe erg quem wn ro o pen od mad elle cas a md muet d me Be ques on oma itum Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 139 262 Example 2 4 1a single isotropic plate general method Envisaged application It is foreseen to use the following conditions temperature 20 C 15 pressure 101325 Pa 16 The reference spectrum is supposed of the type pink noise 19 with a sound power level of 130 dB oct 20 It is wished to compute the sound reduction index with an atmospheric back 24 of 1 25 aluminium plate 26 of thickness 2mm 27 the intrinsic losses of the material being considered 28 with a infinite extend 29 and by an integration of the transmission factor between 0 and 90 30 No sound leak is considered 31 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column
184. e Mach number in the airways M and the geometry of the duct according to various models as shown in the table below model HAN MUN source AHI AH2 the model of mounting is selected as shown in the table below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Page 173 262 model mounting source AH3 a welded pipe with an average of one bend per approximately 20D length b welded straight pipe from approximately 20D length behind the source c welded average value from a and b if not to be specified more precisely d as b but pipe flanged at a distance from 2m to 6m pipe up to approximately 20D length behind the valve with customary solid borne sound coupling between valve and flanged pipe Step AH This step being a complementary feature associated with step X aims at calculating the sound reduction index of a single leaf circular folded spiral seam duct made of 1 layer alone such as plates of set0 regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and at the rear regardless of the selected input data o Bibliograph
185. e T pi m COmpuiston COrmpitetion ot er Acoustic Ea Plane perm MOULE Reciben Layers PArstorx n eo jess COOH m COMA COPPA ex d Fig 0 1b sean t out ratda a WOOALATAL gt Compination COmperatios of of Acoustic ibas Senes mn MODULE LA ye CORIL LA Fenn 28 l ICOSIL tA jion CODOCTA Fig 0 1c As far as MODULES 1 to 9 are concerned A common routine referred to as COALA COmputation of Acoustic LAyers is associated with specific complementary routines o on the one hand the routine COSIL COmputation of SILencers this association basing the features of the MODULE 1 of the software described in the Section 1 of the present user s manual o on the other hand the routine COPPA COmputation of Plane PArtitions this association basing the features of the MODULE 2 of the software described in the Section 2 of the present user s manual o furthermore the routine CODUW COmputation of DUct Walls this association basing the features of the MODULE 3 of the software described in the Section 3 of the present user s manual The routine referred to ass COSTDU COmputation of STraight DUcts is basing the features of the MODULE 4 of the software described in the Section 4 of the present user s manual The routine referred to as COSTDU COmputation of STraight DUcts and the routine COSIL COmputation of SILencers are associated with a specific complementary routine o theroutine COBON COmputation of
186. e computation no influence of a series cloth seems to be taken into account for the computation no influence of a series perforated protection seems to be taken into account for the computation Note 2 in G3 1A is mentioned for G2 1A basing G1 1A complementary information The data pool used for AD is related to splitters in 1 piece with a thickness 2d 0 1 or 2d 0 2 m with A d h 0 5 to 4 Model FRO ZER Bypass correction as above no limitation although at the time of the present user s manual the conditions of the measurement of the data pool G1 1A G2 1A are not known with accuracy one can consider that Dk Dk1 Dk2 the 2 terms being presently not known separately with Y Dkl to be accounted for the vibration transmission along the duct wall for the sound transmission over the duct wall for the vibration transmission along the splitter frame as described in G1 1A and for the imperfection of the interface between the lining and the duct Y Dk2 to be accounted for the inhomogeneity of the used absorber in directions parallel to and perpendicular to its surface a unique model is used for taking into account the limitation of propagation whatever ox1 oy1 is may be that this correction should be used only in the case of an inhomogeneous absorber in directions parallel to and perpendicular to its surface when the hypothesis ox1 oy1 1 is used for the computation For those reasons the value obtain
187. e inhomogeneity of porous media in directions parallel to and perpendicular to its surface i e no different properties depending on the used model in directions x and y is considered for the routine COmputation of Plane PArtitions Note 1 each layer is assumed to not be glued to another Note 2 concerning the perforated protection of the set i the porous medium taken into account with the models of added impedance ROA and RDE is Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 113 262 at the rear the porous medium of set i at the front the porous medium of set i 1 if i lt 4 even if i 1 gt imax the selection of a reference different of AIR for the porous media of set i such as i gt imax is highly discouraged or the front atmosphere if i 4 Note 3 the use in practical cases and the corresponding prediction of performance of a perforated protection in contact with something else than a porous medium that can be air at the front or a thin wire mesh spacer at the rear in some cases is highly discouraged Step M This steps aims at taking into account series thin plates used in the acoustic structure thin plate o Bibliography references M1 M2 M3 M4
188. e obtained results are comparable with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss 2004 7 3 How to use SILDIS Operating conditions security level safety See corresponding in the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for which input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used Worksheet Cells Tu in COALA E13 137 W38 something like that Worksheets attention has to be paid to the fact that the considered sheet is not included in the worksheets listed below Regarding the COmputation of NOZzle reflections the software SILDIS is configurated in order to allow the user to access to various worksheets being linked as shown in fig 7 2 the overview of the worksheets being shown in table below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 232 262 Fig 7 2 in out CONOZ Note temperature and pressure condition
189. e of set 0 regardless of the other selected parameters of such plates for set 0 regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references X1 x2 o Comments the model of minimum for Rdif is selected as shown in the table below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report PhR15 008A Step Z Date 01 04 2015 model KOP NAT source X2 the sound reduction index is derived as for the general case cf X 1 Page 168 262 This step aims at calculating the insertion loss of set 1 when compared to set 0 with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references Z1 o Comments the model of cover is selected as shown in the table below model RIG LIM source 4H Z1 RIG RIGid LIM LIMp Step AA This step aims at calculating the transmission loss with sound leaks with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references
190. e prediction of performance of silencers with chambers containing absorbing material located either at the Rear mounting RPTR RPTR or at Lateral mountings RPTL RPTL The determination of the propagation loss is done depending on the choice of the user for the following cases ox1 cy1 oo absorber locally reacting depending on dlocal and hlocal for mountings RPTR RPTR resp dlocal and Hslocal for mountings RPTL RPTL 6x1 6y1 1 absorber bulk reacting depending on dbulk and hbulk for mountings RPTR RPTR resp dbulkl and Hsbulk for mountings RPTL RPTL For high frequency a correction HF correction can be applied depending on the choice of the user see L1 L2 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report PhR15 008A Aerodynamics e Steps of the computation Step a Date 01 04 2015 Page 50 262 All computations have been gathered in this single step for the sake of simplicity this step aims at computing the total pressure loss due to the silencer o Bibliography references a1 a2 a3 a4 a5 a6 a7 a8 o Comments The total pressure loss due to the silencer is computed with the hypothes
191. easurement of sound insulation in buildings and of building elements Part 3 Laboratory measurement of airborne sound insulation of building elements 1995 and in case of rigid impervious back see NF EN ISO 354 Acoustics Measurement of sound absorption in a reverberation room 1993 and also ISO 10534 1 Acoustics Determination of sound absorption coefficient and impedance in impedance tubes Part 1 Method using standing wave ratio 1996 2 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a All computations have been gathered in this single step for the sake of simplicity See corresponding in Section 1 2 2 2 Acoustics e Bloc diagram The computation scheme of plane partitions is according the bloc diagram below cf fig 2 3 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 110 262 enoia rot od mA peace sews t cama M fig 2 3 Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRXX 015 Note 2 the main steps the steps involving a physical modeling being referred to from A to T have been taken into account for the bloc diagram above some of the paramet
192. ectangular duct 1 steel plate alone thickness such as those of set 0 n break out sound reduction index see lines 102 to 123 columns AA to AN Tables of results and graphs for a rectangular duct set 1 set 0 coupling 0 a insertion loss see lines 125 to 145 columns AA to AN Tables of results for a rectangular duct TL out Rdif ILstat D break out transmission loss see lines 147 to 151 columns AA to AN Tables of results for a rectangular duct Lw out break out sound power level see lines 156 to 160 columns AA to AN Tables of results for a rectangular duct Lw out break out sound power level see lines 162 to 166 columns AA to AN Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 181 262 Worksheet in out COCID OUT gt IN o Input data Item Cell for Foreseen action Comment input Select a model in the 1 first approach displayed in the same worksheet Model for Rdif e proposed list 2 second approach displayed in the same worksheet n Accounting IL stat 0 1 XI151 FORNO ue Hi for XES input 1 model X158 Select a model in the proposed list o Main displays of the results Tables of results and graphs f
193. ed by the means of the unique model FRO has to be considered as a typical general estimation of the limitation of the propagation loss useful when no accurate regression is available for a silencer with a particular filling and particular modalities of construction this is often the case Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 91 262 Step H 1A This step aims at taking into account the reflection loss in the silencer in order to predict an insertion loss o Bibliography references HI IA H2 1A H3 1A o Comments The reflection loss Dr in dB is basically computed at frequency steps of 1 21 octave then averaged per 1 3 octave frequency band general case no influence of the speed of the airflow is taken into account for the computation Model MUL ZER as above Reflection loss higher modes no reflection integrated No influence of a series cloth is taken into account for the computation no influence of a series perforated protection is taken into account for the computation The data pool used for Dr is related to splitters with a thickness 2d 0 1 or 0 2 or 0 3 m filled with 1 porous medium with a flow resistivity 6x
194. edance Nsm Zan normalized characteristic impedance a a exponents for the expression of Dan p B exponents for the expression of Zan Qv high frequency limit of the tortuosity Ta propagation constant rad m Pan normalized propagation constant Ta propagation constant in the x direction rad m Tay propagation constant in the y direction rad m A thermal characteristic length m viscous characteristic length m Perr effective density kg m Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 105 262 open porosity o static air flow resistivity specific flow resistance Nsm olx static air flow resistivity in the x direction for porous medium of set 1 Nsm oly static air flow resistivity in the y direction for porous medium of set 1 Nsm Note subscript i for set i except for o1x and oly Cloths d thickness m M surface density kg m R superficial flow resistance Nsm Rp parallel resistance losses due to mounting Nsm Note subscript i for set i Perforated protections a diameter of holes width of slit m d thickness m M surface density kg m R series flow res
195. een action Input See placemark input comment Select a reference of V17 to material in the proposed Reference W17 list for each layer of VISCO ALU 43 45 interest V23 to Input a real positive Thickness W23 Amber 0 002 0 002 44 46 Model of composite L31 Select a model in the MOI 47 proposed list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 152 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out CODAP for example 2 4 4 Dod owe me 2B BMH olan jf p mre rr Vin en arm citons trs Mei puas 2x xn vom Anm le Ai Dope of LVS tapas Maren Compaen ot YE eres Sewers set Mey Dons piety 1 i i Example 2 4 5 plate with a constrained damping Envisaged application It is foreseen to compute the engineering constants for a damped plate consisting of GLASS plate 48 of thickness 4mm 49 viscoelastic plate reference PVB in the database 50 of thickness 0 5mm 51 1 GLASS plate 52 of thickness 4mm 53 The model of composite MAX is considered 54 Input data The input data required for the computation are listed hereafter in reference with the above data
196. een action Input See placemark input Perimeter of the cross section vs 0 7853 of the silen er a Input a positive real 6 Area of the cross section of ijs 0 049 the silencer m2 Input a positive real 6 Model for TL out Select a model in the COCID proposed list Model of silencer Select a model in the ZER No silencing effect proposed list accounted Model for Lw out Select a model in the 2081 9 proposed list Finite elements method 0 1 Input 0 to answer no 0 input 1 to answer yes Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 215 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COALA E mer uae tm gode c efc th otin qoem y noter cd tere rel ph orca a pL Marinin dile rn we L A C mqueeem e BP smn mcr nmi Pn Torr spia 2 u n view Haa omini eat bhe vn gels rre n and NOL oat abad pec Model iioi cd OU N apana mei mis iis amps berger mimi m mr mg Lin grt her e Or et pim men m Lm ot E gt M Omnem Pare fn emm Titan a oc Docs lev m Cete cf b equis Dti oad D Cwngemmon ef 8 ence Cg
197. efficient at normal incidence alphaO 1 00 0 90 r 0 05 r 0 20 r 1 00 0 80 0 70 20 60 E 20 50 0 40 0 30 0 20 0 10 0 00 1 10 100 1000 10000 100000 f1 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k 1 0 05 0 00 0 00 0 00 0 00 0 00 0 01 0 02 0 09 0 14 0 04 0 01 0 01 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 1 0 20 0 00 0 00 0 00 0 01 0 02 0 03 0 08 0 29 0 44 0 13 0 05 0 02 0 01 0 01 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 r 1 00 0 01 0 01 0 02 0 04 0 07 0 14 0 32 0 73 0 90 0 45 0 20 0 10 0 05 0 03 0 02 0 01 0 01 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 Comment the use of a membrane absorber allows an absorption coefficient at normal incidence in a very narrow frequency band The choice of a parallel resistance accounting for losses in relation with mounting conditions influences sometimes considerably the acoustic performance at least for some frequencies The way the membrane is fixed on site onto the cavity limit conditions properties of the interface influencing the effective losses differs of foreseenable cases furthermore the stiffness of the membrane itself is disregarded when accounted as a series cloth what is not important only for sufficiently large plates Due to those
198. el of effective critical Select a model in the frequency proposed list Number of identical plates Input a real positive number i Input a real positive taken into account for the computation as a non zero Thickness number value only if a non zero value in cell just above Note temperature resp pressure of cell D6 resp D7 also apply to thin plates data of the third table below are not modifiable by the user despite the displayed color of the cell Item Foreseen action Comment Cell for input For test room conditions common value applicable to the fluid to porous media Input a real number below temperature to series cloths to perforated protection For test room conditions Input a real positive common value applicable to the fluid to porous media below pressure number to series cloths to perforated protection Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Worksheet in COSIL o Input data Date 01 04 2015 Page 55 262 Item d m OC Ss m Sa m HF correction 0 1 Limit set index ilim To get h d h To get d h To get d h local To get d h bulk
199. ell for input Foreseen action Comment for English input E for French input F Modification of the displayed date Input a string Input a string Input a real number common value applicable to the fluid to porous media to series cloths to p erforated protection Input a real positive number common value applicable to the fluid to porous media to series cloths to p erforated protection Input an integer from 0 to 4 Select a material in the proposed list for each layer of interest Input a real positive number Select a reference of element material in the proposed list for each layer of interest For NO press 0 for YES press 1 Input a real positive number Select a reference of element material in the proposed list for each layer of interest For NO input 0 for YES input 1 Input a real positive number imax is the maximum set index taken into account for the computation despite the status of the selection of the parameters related to sets with an index i gt imax for CODIS only a possible inhomogeneity in directions parallel to and perpendicular to its surface i e different properties depending on the used model in directions x and y is considered for the porous medium of set 1 porous media of sets 2 to 4 being considered homogeneous taken into account for the computation as a non zero val
200. elow model BER MOI AB M 1 source M 2 dps M 7 M 4 The density of the equivalent plate is computed as for a monolithic plate of same surface density and of same total thickness the sum of the thicknesses of the 2 layers of the composite as displayed in worksheet in out CODAP is required as an input in the worksheet in COALA for the thickness of the thin plate referenced 2 PLY The Poisson s ratio of the equivalent plate is set to the Poisson s ratio of the thin base plate The use of results of computations involving damping materials with Poisson s ratio not sufficiently close of the Poisson s ratio ofthe thin base plate is discouraged Step M This step being a complementary feature associated with step M aims at calculating the properties of damped plates made of a 1st thin plate base plate a damping material and a 2 thin plate constraining layer in the acoustic structure constrained damping as shown of figure 2 9 below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 116 262 fig 2 9 Lf constraining plate base plate damping plate In order to include the calculations in the general layout of the program an
201. elow is set to 1 399 or 1 400 or 1 401 or 1 402 depending on the eponym selected model shown in the table below when used the specific heat capacity at constant pressure of dry air c is computed according various models as Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Date Page 01 04 2015 34 262 model MEC MEC2 KRA a1 using a1 using a a regression regression R for a the for Pr the a3 using source a regression regression session for c being for cp E in error being in error limiting 73 15 to 173 15 to 20 to 800 temperature 926 85 C 926 85 C C Conversion B J cal factors J 1 0 2388 cal 4 1868 1 2 the following relation apply K 1 IE Cs cy p when used the thermal conductivity of dry air is computed according various models as shown in the table below model MEC KRA al using a a3 using source a regression regression limiting 173 15 to 20 to 800 temperature 926 85 C C Conversion b J cal factors J 1 0 2388 cal 4 1868 1 when used the diffusivity of dry air ais computed from a1 Note a A p ep when used the Prandtl number of dry air Pr is computed according various
202. em LRL exe tet Lit 153 Envisag ed application uso ee epe A et die ever dan 153 Input datare nes nt nee AIR M es Re Sn ee ee Ac nee 153 Screenshots of the worksheets for the example of computation 154 2 5 Illustrations of effects taken into account with SILDIS 155 Minuto mEE B 155 Effects of the properties of a porous medium in a non laminated lining eese 155 Effects of the properties of porous media in a laminated lining ee 156 Effects o temperate dico ni ORDRE RO DOE N E A E A a 157 Effects of press re 2 0 n GI HG UL te M te nel At int MEG eH He ADE 158 Effects ob a series cloth uec ene NIU CUN NR NIE Ree UE 159 Effects of a series perforated protection 160 Effects of membrane resonator ssssssssssssseseeeeeneeeeee nennen nemen nnne enne e enne re enne rennes 161 Effects of PACK eee ee ee teer eet eee e eee e Ee Eee eve Ee eee eee e Eae ER een Do eda 162 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 9 262 Appendix to Section 2 list of symbols sse 163 Sect
203. ement results for feeding some of those models and for allowing the necessary improvement through correction factors of the correlation between some calculations and on site observations The obtained results are not comparable with standardized measurement due to the lack of such documents 8 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a All computations have been gathered in this single step for the sake of simplicity See corresponding in Section 1 8 2 2 Acoustics regarding the longitudinal noise propagation i e for the computation of the sound power level downstream of the duct system e Bloc diagram on fig IDS 1 below this bloc diagram is used within a waterfall computation for all the components of the system referred to as C1 to C10 sound power Fig IDS 1 insertion loss without including self self noise BAA noise amp insertion loss with self noise BAC self noise BAB C C1 C2 C3 C41 C5 C6 C7 C8 C9 C10 C Lwicale Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRxx 015x Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01
204. ementary set set 0 and a rear atmosphere are displayed they are none of interest for the COmputation of DIssipative Silencers only the case of an impervious rigid back at the rear of set1 applies for the COmputation of SILencers data concerning series thin plates are displayed they are none of interest for the COmputation of DIssipative Silencers not taken into account whatever the input data concerning thin plates are in worksheet in COALA Worksheet Suitable for mountings Input data Results in COALA 1A all for sets for reference spectrum 7 particular conditions for the design of in COSIL 1A all the silencer indicat f perf ti in out CODIS 1A RD condition of propagation of sound VEU guam ME amp Aerodynamics Input data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with o theinput data See corresponding in the chapter General considerations As far as porous media series cloths and series perforated protections are concerned specific data bases libraries will allow the design to be made with in built engineering data constants referred to as Usual in the worksheets of the software Warning some properties of the presently referenced materials still not have been checked by reliable sources See also report PhRxx 015x Collection of soundproofing constructions systems a companion to User s manual fo
205. ent plate see cell J28 overall thickness of the equivalent plate see cell J29 torsional rigidity per unit width see cell J35 Worksheet in COALA See corresponding in Section 1 Worksheet in out COPPA o Input data bending stiffness per unit width in the x direction maximum see cell J31 bending stiffness per unit width in the z direction minimum see cell J32 Cell for Item Foreseen action Comment Limitation of radiation For NO input 0 for YES 0 1 input 1 Large power nd forthe Input a positive real calculation Size of the baffle in which the partition is symmetrically mounted along the x direction Input a positive real Size of the baffle in which the partition is symmetrically mounted along the z direction Input a positive real Size of the partition along ANDE Input a positive real the x direction P P Size of the partition along faa Input a positive real the z direction P P Model for the calculation of Select a model in the fll proposed list uw Select a value in the LP proposed list Select a value in the Ea proposed list ia Select a value in the TuS proposed list Teta max Select a value Gn the proposed list Model for teta L Select a model in the proposed list alpha sab max Input a positive real length of slit m Input a positive real
206. equal to the bypass correction calculated for the mounting RPTR resp RPTL all things being also equal Step H This step aims at taking into account the reflection loss in the silencer in order to predict an insertion loss o Bibliography references H1 H2 H3 Step I Comments The reflection loss Dr in dB is basically computed at frequency steps of 1 21 octave then averaged per 1 3 octave frequency band general case no influence of the speed of the airflow is taken into account for the computation Model MUL ZER as above Reflection loss higher modes no reflection integrated No influence of a series cloth is taken into account for the computation no influence of a series perforated protection is taken into account for the computation The data pool used for Dr is related to splitters with a thickness 2d 0 1 or 0 2 or 0 3 m filled with 1 porous medium with a flow resistivity 6x1 6y1 from 9 to 15 kNsm 4 an extrapolation of Dr with a different thickness has been used At the time of the present user s manual the conditions of the measurement of the data pool H2 H3 are not known with accuracy especially the higher modes propagating in the duct in relation with the characteristics of the testing facility mentioned in H2 with a front section from 0 5m 0 5m to 1 3m 0 5m For those reasons the value obtained by the means of the unique model MUL has t
207. equivalent series thin plate composite is considered referenced 3 PLY available in the list of thin plates of the worksheet in COALA for which the corresponding parameters are first derived from the input data of each layer of the composite by the use before using the worksheet in COALA of a complementary worksheet referenced in out CODAP COmputation of DAmped Plates At the date of writing of the present user s manual it has not been checked in a satisfying way the accuracy of the software for the computation of the performances of sandwich panels with a thickness of the core much greater than the thickness of the laminates and or with any extensional stiffness At the date of writing of the present user s manual it has not been checked in a satisfying way the accuracy of the software for all the possible models involved in the step P when the reference 3 PLY is used for the plate o Bibliography references M 1 M2 M3 o Comments The Young s modulus and the loss factor of the equivalent plate referenced 3 PLY are computed according various models as shown in the table below model BER MOI MAX V SET VU source de Ios e combining models BER and MOI The density of the equivalent plate is computed as for a monolithic plate of same surface density and of same total thickness the sum of the thicknesses of the 3 layers of the composite
208. er Incorporation of the series For NO press 0 for YES 0 perforated protections 0 1 press 1 Incorporation of the series For NO input 0 for YES 0 cloths 0 1 input 1 Reference Selecta eens in the STEEL ALU 33 26 proposed list Select a number in the 1 2 proposed list select 1 Model of losses pelts modeLan ihe INT INT 35 28 proposed list Model of effective critical Select a model in the frequency proposed list Number of identical plates ae positive 1 1 32 25 number Thickness Inputa real positiye 0 002 0 002 34 27 number Lw0 only known per 1 1 For NO input 0 for YES 1 20 octave frequency band 0 1 input 1 Input a real positive number as requested for a 130 20 LwO 1 1 octave band sound power level Worksheet in out COPERF for example 2 4 2 No input data required for the example of computation Worksheet in out CODAP for example 2 4 2 See corresponding 8 for example 2 4 0 Worksheet in out COORT for example 2 4 2 No input data required for the example of computation Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Worksheet in out COPPA for example 2 4 2 Page 148 262 See placemark
209. eral model ARA only Elementary time period At m s for calculation of T 0132 Input a real number For general models ISO amp SAK only T evaluation range start dB 0133 Input a real number lt 0 For general models ISO amp SAK only T evaluation range end dB 0134 Input a real number lt 0 For general models ISO amp SAK only o Comments data of the second table below are taken into account only for the calculations using solid angles Item Cen Tor Foreseen action Comment input mini y maxi R35 to U39 Coordinates of elementary surfaces in x planes i e in ipe N amp R45 to Input a real number y P iH z mini z maxi planes x 0 amp x L U49 EN R62 to iui x mini x maxi 1 Coordinates of elementary surfaces in y planes i e in nii emad U66 amp Input a real number lanssa ae R72 to U76 ID ES i R89 to U93 x mini x maxi ai Coordinates of elementary surfaces in z planes i e in 2 amp R99 to Input a real number y mini y maxi U103 planes z 0 amp z H o Main displays of the results Tables of results reverberation time considering absorption coefficients as entered potentially above 100 see lines 117 to 126 Y mot considering atmospheric attenuation not considering objects see lines 119 to 121 not accounting solid angles columns A to O accounting solid angles columns R to AB Y considering atmospheric attenuation not
210. erations in a proposed list for the present version of the program angles from 0 to 89 375 with a step of 1 25 i e 73 angles OL is taken into account according various models as shown in the table below model 90 DAV MOI re 04 05 L 0 source 04 O5 O6 9 9 Accordingly z with respect to the orientation angle Y for a simulation between 2 limiting angles of incidence to choose the user will input by the means of the proposed lists a value for min and a value for pmax Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 120 262 Y fora simulation of a diffuse incidence with respect to the orientation angle 9 the user will input by the means of the proposed lists 5 625 for min and 84 375 for pmax regarding the incidence angle 0 Y forasimulation between 2 limiting angles of incidence to choose without other consideration the user will input by the means of the proposed lists gt avalue for Omin and a value for 6max gt the model for OL 90 Y forasimulation of a field diffuse incidence with respect to the incidence angle 0 usingthe classical approach consisting for a partition of undefined
211. erformances of ducts with SILDIS is founded on a scientific and technical background in relation with o analytical models for taking into account the properties of materials and various physical phenomena useful on the occasion of the computation o measurement results for feeding some of those models and for allowing the necessary improvement through correction factors of the correlation between some calculations and on site observations The obtained results are not comparable with standardized measurement due to the lack of such documents 5 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a All computations have been gathered in this single step for the sake of simplicity See corresponding in Section 1 5 2 2 Acoustics e Bloc diagram in case of a silencer on fig 5 1 1 below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Page Report Date 210 262 PhR15 008A 01 04 2015 Fig 5 1 1 ene e Bloc diagram in case of an empty duct on fig 5 1 2 below Fig 5 1 2 i Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr I
212. erial of the considered wall is equal are concerned specific data bases libraries will allow the design to be made with in built engineering data constants referred to as Usual in the worksheets of the software Warning some properties of the presently referenced materials still not have been checked by reliable sources See also report PhRxx 015x Collection of soundproofing constructions systems a companion to User s manual for the software SILDIS data base library for thin plates available in worksheet in COALA Y contents of the library 21 possible references of material layers v among those references 2 PLY reported from worksheet CODAP data base library for layers constituting the damped plates available in worksheet in CODAP v contents of the library 21 possible references of material layers some alerts in case of input data involving a warning of the user o the place where and the way some results are presented Those key points are reviewed worksheet per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2
213. ering no no no no no no no accounted Explicit formula for T yes yes yes yes yes yes yes Correction Correction Correction for for TINO inhomogeneit inhomogeneit yaccounting y accounting y accounting differences in differences in differences in Comment absorption absorption absorption coefficient of coefficient of coefficient of elementary opposite opposite RE walls ax walls couples k 1to N el ur j OX ay AX Model FIT NEU ARA BAI6 to Source BAII BAI9 BAILO BAI10 BAI10 Applicable even for non no no no no no rectangular room Non diffuse sound fields no no no no no accounted Scattering no no no no no accounted Explicit formula for T yes yes yes yes yes Comment eem eem eem Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 256 262 Model ISO NIJ SAK HOD BAI1 1 to BAI1 1 to BAI 1 to BAII4 to panes BAI12 BAI12 BAI12 BAT13 BAI16 RATES Applicable even for non no no no yes no no rectangular room Non diffuse sound fields yes yes yes no yes no accounted Scattering es es es no es no accounted y y y y Explicit DoE Ta me yes no yes former T model used model used model used Comment
214. ers may not be perfectly familiar with some aspects of this background in order to be anyway in a position of making the best use of this calculation tool attention has to be paid by such users to some particular effects taken into account for the predictions thanks to illustrations applying for a rectangular cross section given in this section of the user s manual The intention is not to give a comprehensive list of the various effects of each parameter that may alone or coupled with others influence the acoustic performance of a dissipative silencer what would be very difficult to do The goal is thanks to examples highlighting major key points considered separately of the design of a dissipative silencer given some known laws of the physics some of the input data being chosen in order to be as demonstrative as possible given the plausible field of typical engineering applications All the numerical results below have been obtained using the software SILDIS with some post treatment for comparisons notably some of those results can not be obtained by the user in the presented form for a sake of simplicity of the software Effects of the properties of a porous medium in a non laminated lining illustration 1 5 1 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters having transverse solid partitions inhibiting the sound propagation along the duct axis inside the non lam
215. ers of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity Note 3 analytical calculations are involved in steps B to T with the exception of step R for which empirical methods are involved e Steps of the computation Step A This step aims at taking into account what is on the back i e at the rear of the acoustic structure See corresponding in Section 1 o Bibliography complementary sources A2 A3 Step B This step aims at taking into account porous media used in the acoustic structure See corresponding in Section 1 Step C This step aims at taking into account series cloths used in the acoustic structure See corresponding in Section 1 Step D This step aims at taking into account series perforated protections used in the acoustic structure See corresponding in Section 1 Step E This step aims at predicting the surface impedance of a multilayered acoustic structure including porous media series cloths and series perforated protections with a back selected in a way appropriate for the considered simulation see corresponding in Section 1 including also thin plates at the front of the series cloths bibliography unchanged Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mai
216. es SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 207 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 208 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 209 262 Section 5 computation of break out noise MODULE 5 of the software 5 1 Introduction Terms and definitions For the needs of the present user s manual the following terms and definition apply No particular term or definition cf section 1 section 2 cf section 3 cf section 4 Mountings and geometry The geometry used for the design of silencer casings with the program SILDIS is as shown in section 1 section 2 cf section 3 5 2 Scientific and technical background The prediction of acoustic p
217. esistivity in the direction normal to the axis of the duct ey1212000kNsm 4 a porosity g 0 95 model M76 with a thickness d 0 1m and a length L 1m No series cloth is considered no series perforated protection is considered The longitudinal attenuation for the 1 1 octave band of central frequency 250 Hz is considered for various sound power spectra of the unsilenced source Lw0 taking into account the propagation loss Da computed on the occasion of the first illustration of this for the corresponding 1 3 octave bands 6 8 dB m at 200 Hz 10 7 dB m at 250 Hz 16 3 dB m at 315 Hz Illustration of one of the effects see below the calculation of the longitudinal attenuation for the 1 1 octave band depending on the sound power spectrum of the unsilenced source see key in the table 1 1 octave band 1 3 octave frequency band central frequency Hz central frequency Hz 200 250 315 250 LwO dB ref1E 12W 75 2 75 2 75 2 80 Case 1 Da L dB 6 8 10 7 16 3 Lw0 Da L dB reflE 12W 68 4 64 5 58 9 70 2 longitudinal attenuation for the 1 1 octave band 9 8 LwO dB ref1E 12W 68 0 75 0 78 0 80 Case 2 Da L dB 6 8 10 7 16 3 Lw0 Da L dB reflE 12W 612 64 3 61 7 67 4 longitudinal attenuation for the 1 1 octave band 12 6 Lw0 dB ref1E 12W 78 0 75 0 68 0 80 Case 3 Da L dB 6 8 10 7 16 3 Lw0 Da L dB reflE 12W 71 2 64 3 51 7 72 0 longitudinal attenuation for the 1 1 octave band 8 0
218. f silencer insertion loss referred to as Di is selected according to various models as shown in the table below model CODIS1 CODIS2 CORESPTR CORESPTL ZER BYO as derived amp as derived amp insertion loss TL out as derived amp as derived amp displayed in displayed in ZERo i e figures to be S tte displayed in displayed in worksheet worksheet ZERo entered by worksheet worksheet CORESPTR CORESPTL silencer user BYO CODIS1 CODIS1 effect Bring Your Own the model for the sound power level radiated by duct or casing walls referred to as Lw out is selected as shown in the table below model 2081 HAN ASH AVI source AV2 AV3 AVA the correction factor to account for gradually decreasing values of the sound power level inside the duct as the distance from the sound source increases only accounts the sound attenuation A dB m due to internal ductwork losses which is computed as Di L 5 3 How to use SILDIS Operating conditions security level safety See corresponding in the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for which input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used Isolation Technologie Services SARL au capital de 7000 Euros Si ge soci
219. f the silencer Those results are only displayed in order to allow the evaluation of the impact of airflow other than self noise by the means of a comparison with results displayed line 105 of flow noise by the means of a comparison with results displayed line 162 Note 2 since the insertion loss is predicted from the sum of the longitudinal attenuation a bypass correction and reflection loss the results corresponding to the different terms of the sum are also displayed in order to allow the evaluation of the impact of each one see table below Term of the sum Cells for display Notation Comment longitudinal attenuation A108 to L127 Da L curve and table of results by pass correction M108 to X127 Dk per 1 3 octave band per reflection loss A129 to L148 Dr 1 1 octave frequency band and in terms of A weighted global value M129 to X148 D i Da L Dk Dr with reference to the reference acoustic power spectrum insertion loss without self noise self noise acoustic power of flow noise see line 153 per 1 1 octave frequency band and in terms of A weighted global value not A weighted acoustic power with silencer Lw1 see line 156 per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum A weighted acoustic power with silencer see line 157 per 1 1 octave frequency band Isolation Technologie Services SARL au capital de 7000 Eur
220. f the worksheets for the example of computation esee 100 Appendix to Section 1A list of symbols sss 104 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 7 262 Section 2 computation of plane partitions MODULE 2 of the software 2 1 Introduction NE 108 Terms and definitions srein ie ee he ee a EP RR RID e ALE eee 108 Geometry DNE cc 108 2 2 Scientific and technical background sss 109 2 2 1 Thermodynamics and fluid dynamics 109 Steps of th comp tati n etg o euge ve dp ree euo E Mee no pedo Pr eee eae cg 109 2 2 2 ACOUSLICS 1 Heec eee eee qe e eet be opere ence ete te perdo eee espe ee bee Ete eere Re Poe gebe es UE ternal 109 Bloc diagram sisi c 109 Steps of the computation cette erii te Aisne d s des ate obese duane beens 110 Step A conditions of the applications 110 Step B porous media used in the acoustic structure 110 Step C series cloths used in the acoustic structure cccceeseceeeeeeeeceeeeeeeeeneeeceececesseaeeceeseneeesesnneeeseeaeees 110 Step D series perforated protections
221. fcz d is wished If a particular value of ZmzM fcz Zo is wished Bending stiffness per unit width in the x direction maximum D x D zz Du Input a real positive number If a particular value of for model MOI only fcz resp M fez Bending stiffness per unit Iipat l positi M 2 1 fcz Zo fez d width in the z direction pu AE SSH ZmzM fcz Zo is minimum D z D xx D wished input the value given in M32 resp N32 032 P32 Q32 Torsional rigidity per unit Input a real positive width Di2 2D66 number formode Mealy Model of bending stiffness Select a model in the for model CLA only maximum proposed list Model of bending stiffness Select a model in the for model CLA only minimum proposed list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 134 262 o Comments Item un for Foreseen action Comment input Temperature D5 Value reported from worksheet in COALA cell D6 Pressure D6 Value reported from worksheet in COALA cell D7 o Main displays of the results for the equivalent plate not for the model MOI surface density of the equival
222. ferences KI 1A o Comments The sound power level with silencer including self noise Lw1 in dB ref 1E 12W is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Lw1 10 log 10 0 1 Lw0 Di 10 0 1 Lw Lw being the self noise acoustic power of flow noise in dB ref 1E 12W The insertion loss taking into account the self noise Di in dB is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Di Lw0 Lw1 In case of rectangular silencers the obtained results are comparable with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss 2004 Aerodynamics e Steps of the computation Step a 1A All computations have been gathered in this single step for the sake of simplicity this step aims at computing the total pressure loss due to the silencer Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A o Bibliography references Date 01 04 2015 Page 93 262 a1 1A 02 1A
223. fibers op that can notably differ with op reaching only 0 5 6y sometimes So in this case the airflow resistivity of a material non homogeneous in directions parallel to and Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 43 262 perpendicular to its surface that would be known only thanks to a measurement normal to laminae of fibers as often carried out may be insufficiently known for some design applications for example the sometimes useful average value 0 5 ow o would be only 0 75 6w with a ratio ep ow of 0 5 This a difference along the direction normal or parallel to the laminae is also the case for other properties of numerous materials In the software SILDIS a possible inhomogeneity in directions parallel to and perpendicular to its surface i e different properties depending on the used model in directions x and y is considered for the routine COmputation of DIssipative Silencers for the porous medium of set 1 porous media for sets 2 to 4 being considered homogeneous in directions parallel to and perpendicular to the surface Note 1 each layer is assumed to not be glued to another Note 2 concerning the perforated protection of the set i the porous medium taken into
224. flow noise and total pressure loss 2004 6 3 How to use SILDIS Operating conditions security level safety See corresponding in the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for which input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used Worksheet Cells nil in COALA E13 137 W38 something like that Worksheets attention has to be paid to the fact that the considered sheet is not included in the worksheets listed below Regarding the COmputation of BENDs the software SILDIS is configurated in order to allow the user to access to various worksheets being linked as shown in fig 6 2 the overview of the worksheets being shown in table below in out COBEND Fig 6 2 Note temperature and pressure conditions as well as reference spectrum one should enter in worksheet in COALA Worksheet Suitable for mountings Input data Results in COALA all for sets for reference spectrum in out COBEND COmputation of BENDs for bend dimensions flow rate indicators of performance acoustics Input data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with o the input data See corresponding in the chapter
225. following parameters are taken into account in relation to the properties of a porous medium sometimes only in a direction perpendicular to its surface o Nsm airflow resistivity porosity a tortuosity A m thermal characteristic length A m viscous characteristic length RG kg m3 bulk density model DB BH AB ORV M76 M76 M76 M84R M84V source B1 B2 B3 B4 B5 B6 c c fo parameters o o o o o o RG RG polyester made of mineral fiber or of glass fiber be glasswool porous medium only only and basalt only wool only low comment related to frequency frequency range extension only Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 37 262 model M89 M89 M39 M39 JKD AIR CUM JK2 source B7 B8 B9 B8 o o o o o parameters Qo o Qo RG RG RG A A A A perforated protection with round holes only porous medium made of mineral fiber or of glass fiber only all kind air only low Cancelled comment related to frequency with smoo because was frequenc i i h q y range extension thing Marot only other comments model of added valid
226. for several steps of the computation schemes of different acoustic components insertion loss of a silencer absorption coefficient sound reduction index of a plane partition sound reduction index of a duct wall For this reason worksheets in COALA and in COSIL are distinct due to the existence of other calculations by the means of SILDIS using the routine COALA COmputation of Acoustic LAyers but not using the routine COSIL COmputation of SILencers For this reason also concerning the worksheet in COALA Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Page 52 262 a complementary set set 0 and a rear atmosphere are displayed they are none of interest for the COmputation of DIssipative Silencers they are none of interest for the COmputation of REsonant Silencers with Pine Tree splitters only the case of an impervious rigid back at the rear of setl applies for the COmputation of SILencers data concerning series thin plates are displayed they are none of interest for the COmputation of DIssipative Silencers they are none of interest for the COmputation of REsonant Silencers with Pine Tree splitters not taken into account whatever the input data concerning thin plates are in w
227. g to predictions lower than on site values a safety factor has to be used by the user for taking into account the inhomogeneity of the inflow see Q2 1A 05 1A Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 94 262 1A 3 How to use SILDIS Operating conditions security level safety See corresponding in the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for which input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used Worksheet Cells X in COALA 1A E13 J37 in COSIL 1A D25 BD25 D37 D43 D44 D45 attention has to be paid to the fact that the considered sheet is not included in the worksheets listed below Worksheets Regarding the COmputation of DIssipative Silencers the software SILDIS is configurated in order to allow the user to access to 4 worksheets being linked as shown in fig 1A 5 the overview of the worksheets being shown in table below in COALA 1A in COSIL 1A in out CODIS 1A Fig 1A 5 Concerning the worksheet in COALA 1A a compl
228. garding models of computation the procedures of the model referred to as SMA are selected 5 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA Item ow for Foreseen action Input See placemark input comment Select a reference Reference W31 material in the proposed STEEL 1 list Select 1 or 2 in the 8 ae proposed list l Thickness W38 Input a teal positive 0 567E 3 2 number Worksheet in out CORED1 IN gt OUT Item Cell for Foreseen action Input See placemark input Biggest dimension a AH49 Input a positive real 0 151 3 Smallest dimension b AH50 Input a positive real 0 151 3 Length L AHS1 Input a positive real Mass flow rate AH53 Input a positive real Model of cut off frequency AH60 Select a model in the fco proposed list Model of cross over Select a model in the SMA R81 5 frequency fcr proposed list For f fcr model of Select a model in the SMA d R85 5 transmission proposed list For f gt fcr model of Select a model in the SMA e R90 f 5 transmission proposed list Model of minimum for Rdif R95 SA DRE nine ZBR 5 proposed list Model of maximum for Rdif R99 eer a eg aie BAT 5 proposed
229. h of slit m Input a positive real 1E 50 31 width of slit m Input a positive real 1E 50 31 model Select a model in the 31 Worksheet in out COPPA0 for example 2 4 1a No input data required for the example of computation Worksheet in out COPPA1 for example 2 4 1a No input data required for the example of computation Worksheet in out COPPA2 for example 2 4 1a No input data required for the example of computation Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 141 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in COALA for example 2 4 1a only Tw ER r at me RAN p pmi ie M eque ert erat DES o apie Sepe aind a Lati Move totem tee tug Spe eee OEE Rect carte he ser ong denm snm beta be mpi Dege ma i GLEN RAW ua BH p DE mu J en mua sind mE Erho Loy Try porter pe te mm plane n etit np it LL 22 Pn 18 rmm LOTS ot Casta 95 tret EE Coram otra Drei bere oy Cpu on d mn Cem s 1 OS NT II HUNI IMIiiIms III SSAI m iste ipm d dg a it EN ma ima i m a i irr ws mn hes sesame fee LOCI DET P COBRE HIT AN COR ot Isolation Technologie Servi
230. hR15 008A 01 04 2015 119 262 Step O This steps aims at calculating the sound absorption coefficient for a statistic incidence of the acoustic structure o Bibliography references 01 02 03 04 05 06 o Comments The sound absorption coefficient for a statistic incidence derived by the means of the present step is referred to as astat may be displayed alpha stat o Remarks in relation with the angular integration see Geometry in Section 2 The sound absorption coefficient for a statistic incidence is calculated per frequency band by angular integration according to the generalized customized formula below see notations farther min Omax OL amp 9 0 cos 0 sin 0 d0 Omin astat min 0max OL cos 0 sin 0 dO Omin with the notable exception of the model DAV where the denominator is replaced by 0 5 with respect to the orientation angle the integration is performed from min to max as selected by the user in order to match field considerations in a proposed list for the present version of the program angles from 5 625 to 84 375 with a step of 11 25 i e N 8 angles Recall orientation angle is of interest in case of an orthotropic plate included in the acoustic structure regarding the incidence angle 0 the integration is performed from Omin to min 0max OL Omin and Omax are selected by the user in order to match field consid
231. he case of an inhomogeneous absorber in directions parallel to and perpendicular to its surface when the hypothesis ox1 oy1 1 is used for the computation For those reasons the value obtained by the means of the unique model FRO has to be considered as a typical general estimation of the limitation of the propagation loss useful when no accurate regression is available for a silencer with a particular filling and particular modalities of construction this is often the case particular cases for the mounting R the bypass correction is supposed in all cases to be equal to the bypass correction calculated for the mounting R all things being also equal for the mounting C1 C2 the bypass correction is supposed to be equal to the bypass correction calculated for the mounting R under the condition of an equal speed in the airways all things being also equal Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 47 262 for the mounting Q CO the bypass correction normalized to Da is extrapolated from the bypass correction calculated for mounting R under the condition of an equal ratio d h for the mounting RPTR resp RPTL the bypass correction is supposed in all cases to be
232. he computation of the sound power level downstream of the duct system ccccccccsccccesscceeesneeeeeesaeeeeeseaeeecseeeeceseaaeeesseaeeecesneeeseeaeeeenseseeeseaees 241 Worksheets regarding the transverse noise propagation i e for the computation of the sound power level transmitted by the walls of the duct system sssssssssssssssssseeeeeeeneeeeen eene nnne 243 8 4 Examples of computation with SILDIS 1 see 244 Example 8 4 1 cylindrical attenuator without core bend straight duct the acoustic performance of each component being predetermined sessesssssesseeeeeeeeeeere enne nenne nennen nennen 244 Envisaged application eerte eie ERR REOR er ee t e eri Pee e e ce erit 244 Input data d 244 Screenshots of the worksheets for the example of computation esse 246 Appendix to Section 8 list of symbols sse 248 Section 9 computation of sound decay in enclosed spaces MODULE 9 of the software 9 1 Introduction Me 251 Terms and definitions e redet eee ao e eei A O nt AAEE AO e lee de deep ved 251 Mountings anid geometky 5 22 n hetero aeae tates I OE RR ETE A asa EP EISE DIE Pe ERREUR 251 9 2 Scientific and technical background sss 251 9 2 1 Thermodynamics and fluid dynamics eeeeseeesseeeeeeeeeeeenneee
233. he natural effective critical frequency is considered 4 with a thickness 0 65 mm 5 with a diameter D 250mm 6 The length of the duct is 1 m 7 The flow rate is 1400 m3 h 8 The sound velocity in steel is accounted as 5100 m s Regarding models of computation the procedures basing the model referred to as 2081 are selected 9 except for the high frequency 10 Note the unsilenced sound power spectrum is as shown in the table below 11 F Hz 63 125 250 500 1000 2000 4000 8000 Lw0 dB 73 6 61 6 49 5 44 0 38 3 33 8 35 5 30 5 ref IpW Note the sound power level radiated out of a circular duct walls is displayed in 2 worksheets of SILDIS in worksheet in out COCID IN gt OUT and in worksheet in out COBON Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Page 214 262 The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA Item dd tor Foreseen action Input See
234. he unique index aw is comparable with the standardized measurement see standard NF EN ISO 11654 Acoustics Sound absorbers for use in buildings Rating of sound absorption Step O This step being a complementary feature associated with step O aims at calculating the Sabine s factor of the acoustic structure o Bibliography references O 1 o Comments The sound absorption coefficient derived by the means of the present step is referred to as asab may be displayed alpha sab When alpha stat reaches 1 asab is set to an upper finite limiting value being chosen by the user for the considered version of the software o Remarks in relation with the angular integration see Geometry in Section 2 The Sabine s factor is derived per frequency band from the sound absorption coefficient for a statistic incidence attention has to be paid to angular limits of integration appropriate for a diffuse field see corresponding at step O Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 121 262 o Remarks in relation with the displayed results see corresponding at step O Note in case of rigid impervious back only makes the results displayed for asab
235. hin plate using electro acoustic analogies see figure 2 5 below set 1 to 4 zoom pe fig 2 5 N Ac porous medium series cloth series perforated protection each thin plate can be either profiled when monolithic or with an extensional damping or with a constrained damping see fig 2 6 and 2 7 the surface impedance of the acoustic structure with an impervious rigid back or with an atmospheric back is calculated above the set imax the COmputation of the Plane PArtitions is performed for an acoustic structure with an impervious rigid back or with an atmospheric back including sets from 0 to imax with 0 x imax x 4 series thin plate Note for the considered version of SILDIS calculations with the routine COPPA are possible for imax 0 or for imax lor for imax 2 The less complicated models available for taking into account the physical properties of a porous medium are based on the hypothesis of homogeneity in directions parallel to and perpendicular to the surface of the material i e same properties in directions x y and z Although some porous media including some stone wools some glass wools are known to be non homogeneous in directions parallel to and perpendicular to the surface of the material having in particular an airflow resistivity normal to laminae of fibers ex and an airflow resistivity parallel to laminae of fibers op that can notably differ with op reaching only 0 5 6y sometimes no possibl
236. hy references BAFI BAF2 Step BAG This step aims at accounting the scattering coefficient of walls floor amp ceiling o Bibliography references BAGI BAG2 BAG3 BAG4 Step BAH This step aims at calculating the sound decay in the room after noise off o Bibliography references BAHI BAH2 BAH3 BAH4 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 254 262 Step BAI This step aims at calculating the reverberation time of the room o Bibliography references BAII BAD BAD BA BAIS BAI6 BAI7 BAIS BAI9 BAII0 BAIL BAII2 BAII3 BAII4 BAII5 BAI16 BAII7 o Comments when accounting natural Sabine s coefficients the reverberation time T is computed according to various general models as shown in the table below with the exception of model SAK all models are implemented in considering in parallel on the one hand original formulas and on the other hand modified formulas to account solid angles Model
237. ic extremities Nd number of central splitters for mounting RD Concerning the area of the duct upstream and downstream above and below the silencer A compared to the area of the overall section of the silencer Af predictions with the software SILDIS can be done for mountings RD with A Af Section of the duct above and below the silencer A R R depending on mounting A Af B H Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 86 262 The direction parallel to the axis of the duct is referred to as x the direction normal to the axis of the duct along the width B is referred to as y the direction normal to the axis of the duct along the height H is referred to as z according to the fig 1A 2 below I I P Bee 1A 2 Scientific and technical background The prediction of acoustic and aerodynamic performances of dissipative silencers with SILDIS is founded on a scientific and technical background in relation with o analytical models for taking into account the properties of materials and various physical phenomena useful on the occasion of the computation o measurement results for feeding some of those models and for allowing the necessary improvement through correc
238. icable in case of a thickness of the plate not sufficiently small for allowing to consider the plate as a thin plate is computed according various models as shown in the table below 0 5 model GER NF NAT source M7 M8 M9 fceff fc Step M This step being a complementary feature associated with step M aims at calculating the properties of series perforated plates in the acoustic structure This steps aims at taking into account series thin plates used in the acoustic structure In order to include the calculations in the general layout of the program an equivalent series thin plate is considered referenced PERFO available in the list of thin plates of the worksheet in COALA for which the corresponding parameters are first derived from the input data of the layer by the use before using the worksheet in COALA of a complementary worksheet referenced in out COPERF COmputation of PERForated plates perforated plate o Bibliography references M 1 o Comments The Young s modulus of the equivalent plate depending on open area ratio is computed according various models as shown in the table below model MEC source M 1 The density of the equivalent plate depending on open area ratio is computed as for a monolithic plate of same surface density and of same thickness The Poisson s ratio of the equivalent plate is set to the P
239. ices SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 118 262 M surface density kg m2 p pressure Pa t time s w lateral transverse displacement m and where the bending stiffnesses Dij 1 and j varying from 1 to 2 Nm can be expressed as Dii D x 2 Di2 2D66 2 D xz 2 H where D xz D x D with the exception of the model MOI where D xz is an input data D D z When used the frequency corresponding to the mode 1 1 of thin plates fj may be displayed f11 is computed according various models as shown in the table below model HAN HEA source M 6 M 8 The Young s modulus of the equivalent plate referenced ORTHO is set to the Young s modulus of the base thin plate The density of the equivalent plate is computed as for a monolithic plate of same surface density and of same total thickness the overall thicknesses of the plate as displayed in worksheet in out COORT is required as an input in the worksheet in COALA for the thickness of the thin plate referenced ORTHO The Poisson s ratio of the equivalent plate is set to the Poisson s ratio of the base thin plate The loss factor of the equivalent plate is
240. icity See report PhRxx 002x pages 6 to 7 report PhRxx 006x pages 2 to 3 report PhRxx 015x Note 2 the main steps the steps involving a physical modeling being referred to as A to K have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity the calculation is carried out with the hypothesis of plane waves typically regarded as the least attenuated mode only for step H are other modal contributions taken into account Note 3 analytical calculations are involved in steps B to F and J to K empirical methods are involved in steps G to I Note 4 step F is depending on the conditions of axial sound propagation inside the lining Note 5 the bloc diagram above is suitable for rectangular dissipative silencers whatever the considered mounting is among R R Note 6 comments for other dissipative silencers under the condition of same speed in the airways o for the mounting C1 and C2 the performance from step F to step K is extrapolated from the performance of the mounting R to which steps A to E are referring not suitable for silencers with too small diameters o for the mounting Q and CO the performance of step F is extrapolated from the performance of the mounting R to which steps A to E are referring not suitable for silencers with too small diameters in case of m
241. ies perforated protection is considered The longitudinal attenuation is considered with or without the by pass correction Illustration of one of the effects see below the prediction of the longitudinal attenuation depending on the existence or not of the limitation of the propagation loss see key in the graph longitudinal attenuation Da L 70 without a with 60 50 gu a 40 a S mI E a c 30 a a H 20 10 E gt 3 0 T 5 9 A ad T T ae tt 1 10 100 1000 10000 100000 f Hz f1 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k without 03 05 08 12 19 30 45 68 102 149 213 293 389 49 2 57 9 604 568 51 9 456 348 235 154 101 66 43 29 19 13 08 06 with 03 05 08 12 19 30 45 68 102 149 193 250 324 40 4 46 5 467 45 5 429 39 1 30 6 214 154 101 66 43 29 19 13 08 06 Comment the existence or not of a limitation of the propagation loss influences sometimes considerably the acoustic performance of the silencer at least for some frequencies The influence of the conditions of propagation inside the lining has already been pointed out in a previous illustration attention has also to be paid to the imperfection of the interface between the lining and the duct leak occurring by pass Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Sain
242. il contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 124 262 general model SHA MOI source P6 forced transmission yes yes no parameters resonant transmission no yes no partition in a baffle no yes no niche effect not appropriate for computations with the plate referenced 3 PLY see below when used the general model MOI allows to compute the sound reduction index R as a function of frequency f as follows gt below the critical frequency fc Y for f sufficiently below fc the forced transmission factor tforced is derived according various models as shown in the table below model 4TO 3TO INT SEW BAL DAV P 5 P 6 source P7 P 5 P 8 P 9 2 P 7 P S i P s Po D model JOS GER NF NII ND ZER gt P 3 source P 11 P 12 P 13 P 14 P 15 tforced 0 see step M in case of a non pure thin plate see also steps M to M see remarks in relation with the angular integration below the use of this model is highly discouraged if the same choice of model is not made for resonant transmission Y for f sufficiently below fc the resonant transmission factor tres is derived according various models as shown in the table below model SEA JOS NF NII ND ZER source P 4 P5 ba P 3 p e DNE
243. in out CODIS1 for example 1 4 1 ii i is n M nM etn Ye iret Fem irem o i mnndi ee ae e n t Wi 2 8 ae el EE E EDI L Un mori 5 20 Rm 1 CR Tee CE jemnost ee a ee ee ee ee 2 LV Se SG WU V lc t LIS SS d ee RW wm LIA ee J A rer t Sm sa ed Ml nme id qXm ide me te veo nd moa Les CLSC RESTE SSL 7 71 LL LES mee fM t Cn dent mm ues m qa Ponge medic Np te onu Vn ie dm erem i 3 soo ow d 18 a amp d A e m e nce mo M Ln t pe Ce mere rmn Te afe of eo eomm ML D sonido Br peered ambe rw Orpen The Lom Me quent malin lis fni in or gini cdd Vo hm be tna ar D mmt mt Tie rem m n wid gem jn my bei d V eni nd Pe sow M emn wi ar cum dy Wy wry edi cili Th erede o Hii jn ibn vi vod mud e Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 63 262 Example 1 4 2a dissipative silencer with a square cross section Envisaged application It is wished to compute the acoustic and aerodynamic performance of a dissipative silencer with a square cross section the area of the duct upstream and downtream above and below the silen
244. inated lining consisting of a single porous medium having at room temperature a flow resistivity in the direction normal to the axis of the duct cy1 varying from 8 to 72 kNsm 4 a porosity 6 0 95 model M76 with a thickness d 0 1m No series cloth is considered no series perforated protection is considered Illustration of one of the effects see below the prediction of the propagation loss depending on the flow resistivity of the porous medium see key in the graph propagation loss Da 8kNsm 4 Da dB m 1 10 100 1000 10000 100000 f1 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 6 3k 8k 10k 12 5k 16k 20k 8kNsm4 01 O1 02 03 05 08 13 21 35 59 98 162 260 376 426 370 311 303 320 181 114 76 44 28 17 11 07 04 03 02 12kNsm 4 Di 02 03 04 07 1 1 17 27 43 68 107 163 232 296 327 322 316 337 322 199 127 78 47 29 18 11 07 04 03 02 0 1 02 04 06 09 14 21 33 49 73 106 150 198 241 269 28 7 309 345 328 216 136 81 49 29 18 1 1 07 0 4 0 3 0 2 02 03 05 08 12 18 28 40 56 76 98 122 148 176 23 7 28 1 330 337 249 152 88 52 31 19 11 07 04 03 02 04 06 09 13 19 26 34 43 52 61 70 80 92 107 159 1560 201 250 300 311 199 11 0 61 35 21 12 09 05 09 02 o5 08 11 16 21 26 92 38 43 49 55 69 73 86 102 124 164 195 247 299 250 132 7i 39 23 19 08 05 03 02 Comment the choice of the flow resistivity of the porous medium influences sometimes considerably the acoustic performance
245. ine 162 Note 2 since the insertion loss is predicted from the sum of the longitudinal attenuation a bypass correction and reflection loss the results corresponding to the different terms of the sum are also displayed in order to allow the evaluation of the impact of each one see table below Term of the sum Cells for display Notation Comment longitudinal attenuation A108 to L127 Da L curve and table of results by pass correction M108 to X127 Dk per 1 3 octave band per reflection loss A129 to L148 Dr 1 1 octave frequency band and in terms of A weighted global value insertion loss without self M129 to X148 D i Da L Dk Dr with reference to the Dore reference acoustic power spectrum Report Date Page PhR15 008A 01 04 2015 58 262 self noise acoustic power of flow noise see line 153 per 1 1 octave frequency band and in terms of A weighted global value not A weighted acoustic power with silencer Lw1 see line 156 per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum A weighted acoustic power with silencer see line 157 per 1 1 octave frequency band insertion loss with flow and self noise Di see line 162 per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum acoustic power without silencer Lw0 and acoustic power with silencer inclu
246. insertion loss s model inthe 3733G 5 proposed list duct length m Input a real 135 6 mod kofselinise Select a model in the 7 proposed list model of spectral correction Select a model in the proposed list Only in case of a circular cross section Item Cell for Foreseen action Input See placemark input comment diameter m Input a real 6 3 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 205 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COALA Ce Me cm f COPI LOB T A ane MX me e Lire ee MU n i eee ab Lao oam mt Der COM CETT OG cq ecd Ces cm Ke Pam 11 2009 6 4 2308 91 2000 S 2 oomen y Tindal T FERE awe aT VRAT model A fact ctia eco LED 3 comme ad Cm ibn no 222 vi opima bma r p rete rere ME i dpi Cerere hepara Mer Comqueen AEE omm S mcns emi Pm Trew splen Maid me mod gm s d 280 2 med men bom n meget irme n ei MMM V gout abs mmpodhoce wodel i ese i modal M3 ET mre med nns is ampi LL TE met dim Ti en gt lom in o mmt ln m nm Limp sto
247. io not J91 B In case of such an alert the input data of cell K77 has to valid be changed STOP valid model NII B92 In case of such an alert the model has to be changed for the same model as in cell E85 STOP valid model ND D92 E In case of such an alert the model has to be changed for the same model as in cell E85 STOP radiation ratio not In case of such an alert the input data of cell K77 has to J96 valid be changed o Main displays of the results Tables of results and graphs for 1 plate such as those of set 0 alone whatever the quantity of such plates selected for set 0 is radiation ratio of free bending waves see lines 75 to 99 columns M to Z sound reduction index see lines 75 to 103 columns AA to AN Worksheet in out COPPA2 o Input data Item car for Foreseen action Comment input general model for Rdif K76 ms me sub model for general model K80 Select a model in the DAV proposed list model for connections for Select a model in the general models K82 SHAI SHA2 SHA3 proposed Hst disse lisi line type K85 Input a positive real connections m vibration transmission factor not for general models K86 Input a positive real FAH DAV SHA1 SHA2 SHA3 compliance of connections for the general model DAV for the K87 input a positive teal compliance model BYO in mN 1 model of compliance for K89 Select a model in the general model DAV proposed li
248. ion 3 computation of duct walls MODULE 3 of the software OO a kn n era UR CRUNCH RUP ce te 165 Terms and definitions eere nere eret ee Eee den ee deveutancesesbaddevvedaadesvddadieawadaadeneices 165 Mountings and geometry in RM nement ERR EA RR REP DRM 165 3 2 Scientific and technical background sss 165 3 2 1 Thermodynamics and fluid dynamics sssesssssssssseeeeeeeeeenereen eene 165 Steps of the computation ene et ener repe eer o e ete e e e e i 165 3 2 2 ACOUSTICS 55555205 PR E AO E uae teonee ueste use P ti ep RII REESE Id 166 3 2 2 1 Acoustics rectangular ducts rennen rennen nnne 166 3 2 2 1 a Acoustics rectangular ducts break out noise 166 Bloc diagram for rectangular duct walls break out noise 166 Steps of the computation for rectangular duct walls break out noise 166 Steps A to V e 166 Preliminary remarks common to step X and step X se 166 Step X sound reduction index of a single leaf rectangular duct made of 1 plate alone eene 166 Step X sound reduction index of a single leaf rectangular duct made of 1 steel plate alone sss 167 Step Z insertion loss of set 1 when compared to set 0 168 Step AA transmission loss with sound leaks
249. ion Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 193 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 194 262 Section 4 computation of duct straight runs MODULE 4 of the software 4 1 Introduction Terms and definitions For the needs of the present user s manual the following terms and definition apply No particular term or definition cf section 1 section 2 cf section 3 Mountings and geometry The geometry used for the computation of duct straight runs is as follows Cross section rectangular circular 4 2 Scientific and technical background The prediction of acoustic performances of ducts straight runs with SILDIS is founded on a scientific and technical background in relation with o analytical models for taking into account the properties of materials and various physical phenomena useful on the occasion of the computation o measurement results for feeding some of those models
250. ion indicators in out COPPA0 with 0 leaf without leaf with an impervious rigid back no input data for the time being sound absorption and sound transmission indicators in out COPPA1 with 1leaf with an atmospheric back for specific complementary models sound transmission indicators in out COPPA2 with 2 leaves with an atmospheric back for specific complementary models for connections sound transmission indicators regardless of corresponding input data Input data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with o theinput data see corresponding in Section 1 As far as thin plates are concerned specific data bases libraries will allow the design to be made with in built engineering data constants referred to as Usual in the worksheets of the software Warning some properties of the presently referenced materials still not have been checked by reliable sources See also report PhRxx 015x Collection of soundproofing constructions systems a companion to User s manual for the software SILDIS data base librar for thin plates available in worksheet in COALA Y contents of the library 21 possible references of material layers v among those references 2 PLY and 3 PLY reported from worksheet CODAP and ORTHO reported from worksheet COORT data base librar
251. is of a uniform air flow supposed to not be rotational taking into account the aerodynamics type upstream and downstream mountings R R CI C2 RPTR Aerodynamics type downstream R C 1 2 Circle 1 2 Circle for central splitters 1 4 Circle for RPTR RPTL RPTL only RPTR RPTL RPTL only Reotangular extreme inner lagging 1 4 Circle for extreme inner lagging Aerodynamics type downstream R C P 1 2 Circle Profiled according 1 2 Circle for central sketch the dotted line mountings R R CI C2 RPTR splitters 1 4 Circle for showing either a Rectangular extreme inner lagging 1 4 Circle for extreme inner lagging symmetry plane or an impervious rigid back see fig 1 13 for mountings Q and CO A Af Af for the present revision of the software lt lt Fig 1 13 V for the mountings of the worksheet CODISI R R C1 C2 the determination of the total pressure loss is done is done according various models as shown in the tables below Model FRO MEC 2081C1 BER ISO a4 source al a2 a6 a3 a1 02 0 6 03 a7 for the mounting R the total pressure loss is supposed in all cases to be sufficiently close to the total pressure loss calculated for the mounting R all things being also equal for the mounting C1 C2 the total pressure loss is supposed to be equal to the total
252. istance Nsm Rp parallel resistance losses due to mounting Nsm open area ratio Note subscript i for set i Silencer abulk cf step F 1A m alocal cf step F 1A m A area of the duct above and below the silencer m Af area of the overall section of the silencer m Ap free area of the silencer passage area of the airways m B width for mounting RD m d overall thickness of the acoustic structure m 2d for dissipative silencers thickness of central splitters for mounting RDdbulk cf step F 1A m dlocal cf step F m Da propagation loss dB m Da L longitudinal attenuation dB Di insertion loss with flow and self noise dB Dv insertion loss with flow without self noise dB Di Da L Dk Dr Dk limitation of the propagation loss dB m Dr reflection loss dB fco cut off frequency of the duct Hz h 2h 2 for dissipative silencers width of extreme air way for mounting RD only m 2h for dissipative silencers width of central airways for mounting RD only hbulkl cf step F 1A m hlocal cf step F 1A m H height for mounting RD m L length without aerodynamic extremities m M Mach number Nd for a dissipative silencer only number of central splitters for mounting RD only Qm mass flow rate kg s Qv volume flow rate m3 s or m3 h or Nm3 h Vf speed of airflow in the area Af m s Vf speed of airflow in the area Af m s Vp speed of ai
253. itive number o Comments Item Cell Tor Foreseen action Comment input Temperature D5 Value reported from worksheet in COALA cell D6 Pressure D6 Value reported from worksheet in COALA cell D7 o Main displays of the results for the perforated plate table of results Tables of results for the reference PERFO Young s modulus of the composite see cell U28 n density of the composite see cell U29 Poisson s ratio of the composite see cell U30 loss factor of the composite see cell U31 Worksheet in out CODAP o Input data Cell for Item Foreseen action Comment input Modification of the Date Bg displayed date possible Project D3 Input a name for the considered project Configuration L3 Input a name tor the considered configuration Comments T3 Input a comment Select a reference of lu material in the proposed PEDE pu list for each layer of interest V23 to ni Thickness W23 U54 puta Pes ee number to W54 Model of composite L31 L41 Select a model n the proposed list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 132 262 o Comments Item vel for Foreseen
254. l 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 170 262 Preliminary remarks common to step AC and step AC o Comments the size of the cross section of the duct the length of the duct the flow rate are not related to the values selected in the worksheet in out COSIL for B and H corresponding input data are entered in worksheet in out CORED IN gt OUT Step AC This step aims at calculating the sound reduction index of a single leaf rectangular duct made of 1 plate alone such as plates of set 0 regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references ACI AC2 AC3 AC4 o Comments when used the cut off frequency for the first higher mode fco is computed depending on the speed of sound c the Mach number in the airways M and the geometry of the duct according to various models as shown in the table below model HAN MUN source ACI AC2 the cross over frequency fer is computed depending on the speed of sound c the Mach number in the airways M and the geometry of the duct according to various models a
255. l contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 111 262 o Comments It has been taken into account that the most sophisticated partition of interest for the applications foreseen at ITS or elsewhere consists of a multilayer filling from inside to outside see report PhRxx 006x 1 layer of perforated sheet being presently with diameter of holes 3mm in a hexagonal array with a perforation rate of 32 thickness 1 5mm 1 layer of cloth being presently to be pr cised 1 layers of porous media being presently to be precised 1 steel plate Air 1 layer of perforated sheet being presently with diameter of holes 3mm in a hexagonal array with a perforation rate of 32 thickness 0 8mm 1 layer of cloth being presently to be precised 1 layers of porous media being presently to be precised 1 steel plate the rear boundary condition for the arrangement of materials of interest for the COmputation of Plane PArtitions being an atmospheric back for the derivation of the sound reduction index possible other useful arrangements of materials for other predictions to be done in relation with the COmputation of Acoustic LAyers not only in the context of COmputation of Plane PArtitions possible other useful rear boundary conditions for the arrangements of materials impervious rigid back for Sabine s factor for example also for other predic
256. l contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 184 262 Screenshot of worksheet in out CORED IN gt OUT a tae M Mi dax atia h maas o Re a es ne a a Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 185 262 Example 3 4 2 circular duct wall pipe Envisaged application It is wished to compute the breakout transmission loss of a circular duct wall pipe for service conditions temperature 100 C 1 pressure 1 E6 Pa 2 The duct is made of steel 3 for which the natural effective critical frequency is considered 4 with a thickness 10 mm 5 with a diameter D 300mm 6 Regarding models of computation the procedures basing the model referred to as 3733 are selected 7 with an average value for accounting mounting 8 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA
257. lar cross section having rectangular splitters of thickness 2d such as 2d 2d 1 200mm made of one porous medium with a cloth of thickness d 1 5 100 mm Y with an old school approach imax 1 0 ilim 1 dlocal 200mm Y witha new wave approach imax 2 amp 1 ilim 1 dlocal 200mm the following definitions also apply in case of rectangular dissipative silencers and in case of mounting Q hlocal d h dlocal hbulk d h dbulk the following definitions apply in case of round dissipative silencer without a central pod mounting CO alocal d a dlocal abulk d a dbulk the following definitions also apply in case of mounting RPTL RPTL Hslocal d Hs dlocal Hsbulk d Hs dbulk determination of the propagation loss The propagation loss Da in dB m is basically computed at frequency steps of 1 21 octave then averaged per 1 3 octave frequency band for the fundamental mode being considered as the least attenuated mode the cut off frequency for the first higher mode fco depending on the speed of sound c the Mach number in the airways M and the geometry of the duct see F5 V for the mountings R R fco 0 5 co max B H 1 M Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its aco
258. le of computation Screenshot of worksheet in out COALA mn a ty Ae mid mis m FE I moi c efc pa otin ouem y noter cd tere rel ph orca a pL Marinin dile rn we gene eA EE mm homens ee Pm Inepte n mpm cmd ibo in tein rome in ii NL V uat addat cepa wodel i pre ts mul RY hes mers dm there agree lew w reran promu P md m por adi stan 1 met fre Lin gt or un Or mnt pim men m Lm vt E gt CI EPA M mper Pe f 22 EEn al cn Does levat m f T Limato cf Fcmnqalar Duc bomi be ET ipe Oepama ei Cents Ae Sab caben tate eme le CETTE CORE PC E mm Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 227 262 Screenshot of worksheet in out COBEND The sts e page MEL et P n penne tid gea ie nd mmm pree ee rert menm Qr c he arr de pot metal iium slm a D nue n Rma nur i ter rem A s mms of me sgh an a he mm Tem na nnd mi nm d P m mln Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail con
259. lencers either dissipative silencers for those equipments the considered cross section can be either rectangular or round with or without a central pod with or without an intermediate annular splitter for a lining including up to 4 porous media up to 4 series cloths up to 4 series perforated protections selected among a library including for each kind of layer more than 20 referenced materials or resonant silencers with so called Pine Tree splitters for those equipments the considered cross section can be rectangular for a lining including up to 4 porous media up to 4 series cloths up to 4 series perforated protections selected among a library including for each kind of layer more than 20 referenced materials For a rectangular silencer the results of the calculations are comparable with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss MODULE IA prediction of acoustic and aerodynamic performance of silencers with discontinued splitters dissipative silencers considered cross section being rectangular for a lining including 1 porous medium 1 series cloth 1 series perforated protection material properties registered in database For a rectangular silencer the results of the calculations are comparable with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement
260. limiting value of the angle of incidence 78 80 85 in any case below 90 in order to reduce the discrepancies between prediction and measurement results especially at low frequency the user will input by the means of the proposed lists 0 for min the closer to the wished limiting angle value for Omax the model for OL 90 gt using the pure approach basing the model referred to as DAV taking into account the dimensions of the partition the user will input by the means of the proposed lists 0 for Omin 90 for Omax and the model for 9L DAV gt preferring not replacing by 0 5 the denominator of the formula above but being interested by the approach basing the model referred to as DAV the user will input by the means of the proposed lists 0 for Omin 90 for max and the model for OL MOI o Remarks in relation with the displayed results The sound reduction index is computed at frequency steps of 1 3 octave from 1 21 octave frequency band values and then calculated per 1 1 octave frequency band for a reference acoustic power spectrum Lw in dB ref 1E 12W In case of a rear atmosphere at the room conditions of temperature and pressure the obtained with an appropriate selection of values of limiting angles of integration result s in terms of sound reduction index per 1 3 octave frequency band are comparable with the standardized measurement see NF EN ISO 10
261. lining at least for some frequencies In particular the choice of a permeability of the cloth too small compared with the optimum required as far as acoustics is concerned can lead to a degradation of the performance for frequencies possibly within the range of interest an increase of the performance being often obtained at low frequency due to the presence of a free vibrating foil Attention has to be paid to the consequences of the use in some locations of cloths producing possibly linings with a high flow resistance especially when nothing is known regarding the properties of this materials in terms of flow resistivity porosity Attention has to be paid also to dust deposits in a position in some cases of involving effects comparable to the effect of a series cloth Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 160 262 Effects of a series perforated protection illustration 2 5 6 Imput data a lining is considered at test room pressure and temperature with an impervious rigid back consisting of a single porous medium having a flow resistivity oyz72kNsm 4 a porosity 6 0 95 model M76 with a thickness d 0 1m The perforated protection consists of a sheet R3T5 round h
262. list Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 183 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COALA m OED ED i i uwe or re F f O y h pr r B m fr 45 4 259 c mm ines jacet po pe mt enne ET oum cu 6 aded imt comm o men of pus bare ch fe me comm Arey triremes i D det LL omm e n M bf v sa bd apaau meh ane m btdd 9300 Ms ma Ma en Moget iii M que Wht osat bbc mee De pen acd om m M cine Ini e assem tet ew de Ra m comte prre EX IZ Deer he C quatus ines bene je mpm eye mest teen a me L Zi ih ead mt md Mu merde uen ma L g a Bape vot ome Loe ge for pe ote cmm ph Petit Ln tet M Ove o i TETE C pet sous of Cate Pu vh e M CLS TES IE CIE INDE IE ISIN EI HEIC Com of ceria Drei nm Fees mr Cm LI Iu T Nr nr uy nr m ge ga rr wm D UM D we I NI Mn ies teens de SOO UR T D COUT AN CORE Na Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mai
263. list of symbols General Cf corresponding in Sections 1 amp 2 Sound decay A obj x m2 equivalent absorption area of objects associated with surfaces for x 0 and x L A obj y m2 equivalent absorption area of objects associated with surfaces for y 0 and y B A obj z m2 equivalent absorption area of objects associated with surfaces for z 0 and z H N number of elementary absorbing surfaces considered for walls floor amp ceiling T reverberation time s T20 reverberation time derived from the first instant where the decay curve reaches 5 dB and 25 dB below initial level s T30 reverberation time derived from the first instant where the decay curve reaches 5 dB and 35 dB below initial level s ax average absorption coefficient of the couple of opposite walls in direction x ay average absorption coefficient of the couple of opposite walls in direction y az average absorption coefficient of the couple of opposite walls in direction z axl resp ax2 average absorption coefficient of 1 among the couple of opposite walls in direction x ayl resp ay2 average absorption coefficient of 1 among the couple of opposite walls in direction y azl resp az2 average absorption coefficient of 1 among the couple of opposite walls in direction z ak absorption coefficient of an elementary wall floor or ceiling surface considered among N 6 x 0 resp x L scattering coefficient of surface x 0 resp x L 6 y 0 resp 5 y B
264. listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 260 262 Worksheet in out COSOD Item el for Foreseen action Input See placemark input comment Temperature Input a real number 14 8 1 Length L m Input a real number 20 2 Width B m Input a real number 10 3 Height H m Input a real number 5 4 Sound attenuation in air Input a real number 0 5 coefficient Area of elementary surfaces Input a real number 10 Absorption coefficient Input a real number 0 10 6 Absorption coefficient Input a real number 0 20 7 Absorption coefficient Input a real number 0 40 8 Scattering coefficient Input a real number 0 20 9 Elementary time period At 5 for calculation of T Input a real number 0 005 10 T evaluation range start dB Input a real number lt 0 5 11 T evaluation range end dB Input a real number 0 35 11 Isolation Technologie Services SARL au capital de 7000
265. llowing terms and definition apply Partition acoustic structure see corresponding in Section 0 regardless of what is on the back atmosphere or impervious rigid back Plane partition partition for which the shape of the surfaces on the one hand facing the front atmosphere and on the other hand at the rear are sufficiently close to a plane for example including corrugated plates and profiled claddings but excluding cylindrical shells or pipes Sound reduction index 10 times the decimal logarithm of the ratio of the acoustic power impinging on a partition under test to the acoustic power transmitted by the sample see NF EN ISO 140 3 Acoustics Measurement of sound insulation in buildings and of building elements Part 3 Laboratory measurement of airborne sound insulation of building elements 1995 Rstat with a statistic incidence i e all possible incidence with an equal probability between angular limits Rdif for a diffuse field Sound absorption factor a0 ratio of the acoustic power absorbed by the surface of the sample under test no way back to the incident acoustic power for a plane wave at normal incidence see ISO 10534 1 Acoustics Determination of sound absorption coefficient and impedance in impedance tubes Part 1 Method using standing wave ratio 1996 Sound absorption coefficient for a statistic incidence astat ratio of the acoustic power absorbed by the surface of the sample to the incident acous
266. loss without self noise o Bibliography references AZ1 AZ2 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 231 262 o Comments the insertion loss is computed according to various models as shown in the table below model 2081 ISO source AZ1 AZ2 Step AAA This step aims at calculating the self noise o Bibliography references No particular bibliography applicable o Comments the self noise is assumed to be negligible Step AAB This step aims at calculating the insertion loss including self noise o Bibliography references AABI o Comments The sound power level including self noise Lw1 in dB ref 1E 12W is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Lw1 10 log 10 0 1 Lw0 Di 10 0 1 Lw Lw being the self noise acoustic power of flow noise in dB ref 1E 12W The insertion loss taking into account the self noise Di in dB is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Di Lw0 Lw1 In case of rectangular ducts th
267. ly See corresponding in Section 1 Worksheet in out COPERF for example 2 4 0 No input data required for the example of computation Worksheet in out CODAP for example 2 4 0 and for example 2 4 1 Item Cell wi Foreseen action Input See placemark input comment Thickness W23 input a feal positive 0 001 number see 2 3 How to use SILDIS Operating conditions security level safety Worksheet in out COORT for example 2 4 0 No input data required for the example of computation Worksheet in out COPPA for example 2 4 0 No input data required for the example of computation Worksheet in out COPPA0 for example 2 4 0 No input data required for the example of computation Worksheet in out COPPA1 for example 2 4 0 No input data required for the example of computation Worksheet in out COPPA2 for example 2 4 0 No input data required for the example of computation Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 138 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in COALA for example 2 4 0 only See corresponding in Section 1 Screenshot of worksheet in out COPPAO0 for example 2 4 0 m TRY o NO
268. m 24kNsm 4 E 48kNsm 4 S 0 60 72kNsm 4 E g 0 40 0 20 0 00 1 10 100 1000 10000 100000 f Hz f1 3oct Hz 25 315 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 16k 2k 2 5k 8kNsm 4 0 01 0 02 0 03 0 04 0 07 0 10 0 15 0 23 0 34 0 46 0 60 0 74 0 85 0 93 0 98 0 99 0 98 0 96 0 96 0 99 0 99 12kNsm 4 0 02 0 02 0 04 C 0 13 0 20 0 29 0 39 0 52 0 65 0 77 0 86 0 92 0 95 0 96 0 95 0 94 0 96 0 98 0 99 0 99 16kNsm 4 0 02 0 03 0 05 0 24 0 33 0 44 0 55 0 66 0 76 0 84 0 88 0 91 0 91 0 92 0 93 0 95 24kNsm 4 0 08 0 04 0 07 48kNsm 4 0 05 0 08 0 11 72kNsm 4 0 07 0 0 0 14 8k 10k 12 5k 16k 20k 00 1 00 1 00 1 00 1 00 1 00 00 1 00 1 00 1 00 1 00 1 00 100 1 00 1 00 1 00 1 00 0 99 0 99 1 00 1 00 1 00 8 0 98 0 99 0 99 0 99 1 0 95 0 97 0 98 0 29 0 38 0 48 0 56 0 64 0 70 0 75 0 79 0 82 0 84 0 87 0 90 0 93 0 95 0 96 0 97 27 0 33 0 39 0 43 0 47 0 51 0 54 0 57 0 61 0 65 0 71 0 76 0 81 0 88 0 91 0 93 095 096 0 97 0 98 0 0 27 0 30 0 34 0 37 0 39 0 42 0 45 0 49 0 53 0 58 0 62 0 67 0 72 0 77 0 82 0 85 0 89 0 91 0 93 0 95 0 96 0 97 0 98 0 98 0 99 Comment the choice of the flow resistivity of the porous medium influences sometimes considerably the acoustic performance of the lining at least for some frequencies In particular the choice of a flow resistivity of the porous medium too big compared with the optimum required as far as acoustics is concerned can lead to a degradation of the performance for freq
269. me in ordinary rooms 9 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a All computations have been gathered in this single step for the sake of simplicity See corresponding in Section 1 9 2 2 Acoustics e Bloc diagram The computation scheme of sound decay in a room is according the bloc diagram below cf fig 9 2 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 252 262 i siete dot s iet T m s oT i pi ge ne i R m Le Qo xmi ta z sata rw EAT fig 9 2 Note 1 the service conditions dependence has been omitted for the sake of simplicity Note 2 the main steps the steps involving a physical modeling being referred to from BAD to BAI have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity Note 3 depending on the model selected for the step BAH steps BAE BAF BAG may not be part of the computation scheme Note 4 depending on the model selected for the step BAT step BAH may not be a separate part of the computation scheme when the used approach is ba
270. mment Insertion loss without flow noise dB Input a real 2 4 8 16 31 22 12 11 resp 0 0 0 1 2 3 3 3resp 0 150 1 0 2 0 2 0 3 0 3 0 3 0 3 3 resp 5 resp 7 Flow noise dB Input a real 200 200 200 200 200 200 200 200 resp 26 9 23 0 18 1 12 5 6 5 0 1 7 0 14 4 resp 200 200 200 200 200 200 200 200 4 resp 6 resp 8 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 246 262 Screenshots of the worksheets for the example of computation Worksheet in COALA cdi cf efecto otia feo as nero ideni pn new Creme E cmn Somers nm Pe Ton splen COPA EL T0 omini omen ce n mein em va iai s iw de d nt d cris s amnia eme mom lm nn met mg Lin gt or ue Or et pim men m mg 2e Mr mp Pe P eem 11 Comm al cud Dosh ren m Cupane cH Ec ql Loi noa D Cwegemmom ei Cente wm e caben tate eme le CETTE CORE PC E mm Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478
271. mmm mis cte mg s on miat mid m pre 0 iden s deco Vu CODES LUNES a n t MM Fons e model A ec otin Dora ay 2er ahem nl phew A ba somnis t bati E zoem comme 4 Juans id or tutos odii the eb 4 ptem m n PET I Dont adiu apice wed joues wi 8 omi d tomes cdd c peer ved ID EY e Avani gend Vaid MOX ICH men ire mita queen wm M KPO O LAT res aan f mins me ui mein rro NE Liconsa X berpa Serm X imponi nant kom e angela irre in nad di oce i aH m em Pe 1i bo que lm un Or mnt nm um bn m Lim vt M Ope Fee P em VI Dmm f ocn Dosha berne m Compa es fcr Lens mdb Carpen ei Cents aber tier LIA ee T rS i 4 v nm we ue uan SO et aie atl pt lo EE ES tm eae ji me se wm me em wm m A se deter rgo Is pag pes 3 ims d t Qn 1 1m zn Ir rn enn te am ls OCTET CORE PCT t Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 201 262 Screenshot of worksheet in out COEDLA LOIS aam tot nn mcr on Bent endis mmt Ln P L2 n Men t Hood em a nnn her mnm ttt I IUT 4 GS a a m 210 et WT 3 1H x HO 0 14 eee ne en 7 a 0 t
272. models as shown in the table below i Gase of MEC MEC2 KRA model for cp E al from n a1 using a3 from source a Cp and N Cp and X regression limiting 73 15 to 173 15 to 20 to 800 temperature 926 85 C 926 85 C C Note Pr v a n p a n cy A when used the adiabatic sound velocity in dry air c is computed from a5 Note c Kp a when used the characteristic impedance of dry air Zis computed from a1 Note Z pc 1 2 2 Acoustics e Bloc diagram for rectangular dissipative silencers and comments for other dissipative silencers and for resonators the computation scheme for rectangular dissipative silencers is as shown on fig 1 6 below Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 35 262 back A porcus eda E j misce mpedance propagation loss saris citra C E wth Soa F Y LU LA 4 Ox power sms peci ratec 1 e sieur It gt Dypese Correction msorton bss wthout protectone D gt 1 t nciudeg sef qal sat noise J e e coms 6 reton Les wth eet t tmtecton lows re sof noise I noise K Fig 1 6 Note 1 the service conditions dependence has been omitted for the sake of simpl
273. mum set index imax meen e d d 1 7 Select a reference Reference material in the proposed DEMO 8 I9 list for each layer of i interest Thickness Input a real positive 0 1 5 number Incorporation of the series For NO press 0 for YES 0 13 perforated protections 0 1 press 1 Select a material in the Reference proposed list for each DEMO 12 layer of interest Incorporation of the series For NO input 0 for YES 1 10 cloths 0 1 input 1 Thickness Inputa Teal positive 0 00005 11 number Lw0 only known per 1 1 For NO input 0 for YES 1 20 octave frequency band 0 1 input 1 Input a real positive number as requested for a LWO 1 1 octave band sound 130 20 power level Worksheet in COSIL for example 1 4 1 only Cell for Foreseen action see Item input 1 3 Input See placemark Limit set index ilim Input an integer from 1 to 1 7 imax h d h Input a positive real lt 1 0 5 6 Half airway Input a positive real G25 i e 0 10005 Mass flow rate Input a real 24 1 14 Width B m Input a positive real 1 2 1 Height H m Input a positive real 2 2 Length L m Input a positive real 1 5 3 Select a model in the Model of reflection loss MUL 18 proposed list Model of by pass correction Select a model in the for L gt 1m proposed list FRO 17 Select a model in the Aerodynamics upstream proposed list R 4 Aerodynamics downstream Select a model in the R 4 proposed list Model of total pressure loss Select a m
274. n 213 limi nM 213 Screenshots of the worksheets for the example of computation 215 Appendix to Section 5 list of symbols sse 218 Section 6 computation of bends MODULE 6 of the software 6 1 Introduction eder nt o ane 221 Terms and defimitlons terne eed eetn veo vete eg tn din AKEE AAEE ENKORE AKEE veda ee un 221 Mountings and geometry testten sttretstteessereesseree setet 221 6 2 Scientific and technical background sss 221 6 2 1 Thermodynamics and fluid dynamics ssseeeeeeeeeenen nennen mens 221 Steps of the computation nee HH SH RIReEEE RC einen Re EH intention 221 6 2 2 A COUSLICS eroe ch pre E tee priae ter esc nain eeu dns 221 Bloc diagram il Steps of the coniputati n ee Waco Ses E wlan secte cas EE M somete ari ter 22 Step AW insertion loss without fioe DAT mA 222 Step AX flow fole i oett oreet iret eite E rd ree aUe URN a re VIR eg nette seen sale 222 Step AY insertion loss with flow noise 222 6 3 How to use SILDIS 1 seen 223 Operating conditions security level safety 223 Worksheets eec 525s acc sce D 223 Input data alerts and results the key points 223 6 4 Examples of computation with SILDIS 1 sse 225 Example 6 4 1 cir
275. n lead to a degradation of the performance for frequencies possibly within the range of interest in high frequency the performance is degraded in the example above despite a quite high open area ratio For a given perforated protection the performance can decrease notably in case of a non sufficiently pervious material at the rear see also the last paragraph of illustration 2 5 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 161 262 Effects of membrane resonator illustration 2 5 7 Imput data a membrane resonator is considered at test room pressure and temperature consisting of an aluminium plate of thickness 0 0006 m installed in front of an rigid impervious back distance d 0 1 m accounted as a series cloth of infinite flow resistance No porous medium except air in the cavity is considered no series cloth except the membrane is considered no series perforated protection is considered Illustration of one of the effects see below the prediction of the absorption coefficient at normal incidence depending on a parallel resistance normalized to the characteristic impedance of air r Rp Z0 see key in the graph accounting for losses in relation with mounting conditions absorption co
276. n of airflow equal Input real to the direction of propagation of sound a negative value is related to a direction of airflow opposite to the direction of propagation of sound Input a positive real If a particular value of N For the COmputation of is wished given h DIssipative Silencers only Input a positive real If a particular value of Ncr no compulsory input is wished given h data Input a positive real For the COmputation of REsonant Silencers with Pine Tree splitters only No compulsory input data If a particular value of N is wished given h Input a positive real If a particular value of N resp N is wished then input the value given in O43 resp AQ43 If the extrapolation from mounting R to a particular mounting is wished then input the value given in R43 resp U43 AA43 Input a positive real If the extrapolation to a particular mounting is wished then input the value given in R44 resp U44 AA44 Input a positive real Without aerodynamics extremities Select a model in the proposed list Not applicable for mountings Q CO Select a model in the proposed list Select a model in the proposed list Not applicable for mountings Q CO Select a model in the proposed list Not applicable for mountings Q CO For NO input 0 for YES input 1 For the COmputation of REsonant Silencers with Pine Tree spli
277. n the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for which input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used Worksheet Cells gt E in COALA E13 J37 something like that in out COPPA X53 X54 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 257 262 Worksheets Regarding the COmputation of SOund Decay the software SILDIS is configurated in order to allow the user to access to 1 worksheet referred to as in out COSOD being possibly linked as shown in fig 9 3 to worksheets considered in previous sections of this User s Manuel the overview of the worksheets being shown in table below in out COALA gt in out COPPA gt in out COSOD Fig 9 3 Worksheet Suitable for mountings Input data Results in COALA all material parameters in COPPA all limit angle of computation absorption coefficient g absorption coefficient areas of in out COSOD all reverberation time absorbing surfaces
278. ncer silencer producing an acoustic attenuation from weakly damped resonances of elements The elements of the splitters can contain or not contain absorbing materials Mountings and geometry Silencers having various cross sections are frequently used for industrial applications For dissipative silencers the various mountings for which predictions can be done with the software SILDIS are shown in fig 1 1 and fig 1 2 x n d x LL omi mounting R mounting R mounting R lt i Ff D WS T MUR mounting C0 2 mounting C1 mounting C1 2 mounting C2 fig 1 1 cf worksheet CODISI Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 29 262 1A bel ha 1 Ai IA mounting C2 2 mounting C3 mounting C3 2 mounting CR fig 1 1 continue cf worksheet CODIS1 mounting Q mounting C0 fig 1 2 cf worksheet CODIS 2 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 30 262 Key of the previous figures
279. nd by an integration of the transmission factor between 0 and 90 30 No sound leak is considered 31 The interspace is assumed to be filled with the porous medium reference DEMO 36 with a thickness of 100mm 37 The general model SHA3 is considered 38 for Line Line connections 39 having a distance of 600mm 40 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 147 262 Worksheet in COALA for example 2 4 2 Cell for Foreseen action see See placemark Item Input input 1 3 comment Temperature Input a real number 20 15 Pressure Triput a real positive 101325 16 number Rear atmosphere 0 1 For mp Ut ORTOR YES 1 24 input 1 Mas tina ser de ia Input an d from 1 to 2 Select a reference Reference material in the proposed DEMO 36 list for each layer of interest Thickness Inputa real positiye 0 05 0 05 37 numb
280. nd self noise dB Dv insertion loss with flow without self noise dB Di Da L Dk Dr Dk limitation of the propagation loss dB m Dr reflection loss dB DO overall diameter for mounting CO m D1 overall diameter for mounting C1 m D2 overall diameter for mounting C2 m fco cut off frequency of the duct Hz h 2h 2 for dissipative silencers width of extreme air way for mounting R only m 2h for dissipative silencers width of central airways for mounting R only width of the airways for mountings R C1 C2 Q m hbulkl cf step F m hlocal cf step F m H height for mounting R R m Hs for a resonant silencer only half airway in the chamber m Hsbulkl for a resonant silencer only cf step F m Hslocal for a resonant silencer only cf step F m L length without aerodynamic extremities m Ls for a resonant silencer only length of the chamber m M Mach number N for a dissipative silencer only number of central splitters for mounting R only Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 83 262 N for a dissipative silencer only number of central splitters for mounting R only N for a resonant silencer only
281. nn arr et ts me CE jen a mn pat uA i ZR st at Laut adaa Danai d d AL I Example 4 4 2 circular straight duct air conditioning system Envisaged application It is wished to compute the sound power level downstream of a circular straight duct for room conditions temperature 17 C 1 pressure 1ES Pa 2 The duct is made of steel 3 with a thickness 1 mm 4 with a diameter D 0 25 m 5 The length of the duct is 7 m 6 The flow rate 31400 m3 h 7 Regarding models of computation the procedures basing the model referred to as 2081 are selected 8 Note the sound power spectrum upstream of the considered straight duct section is as shown in the table below 9 F Hz 63 125 250 500 1000 2000 4000 8000 Lw0 dB 73 6 61 3 45 7 42 1 38 4 36 1 38 8 33 9 ref IpW Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Worksheet in COALA Date 01 04 2015 Page 202 262
282. nt Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 238 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 239 262 Section 8 computation of sound impact of a duct system MODULE 8 of the software 8 1 Introduction Terms and definitions For the needs of the present user s manual the following terms and definition apply No particular term or definition cf section 1 section 2 cf section 3 cf section 4 cf section 5 cf section 6 Mountings and geometry The geometry used for the computation of impact of a duct system is as follows for each component inlet cross section outlet cross section rectangular rectangular circular circular rectangular circular 8 2 Scientific and technical background The prediction of sound impact of a duct system with SILDIS is founded on a scientific and technical background in relation with o analytical models for taking into account the properties of materials and various physical phenomena useful on the occasion of the computation o measur
283. nternet www its acoustique fr Report PhR15 008A Date 01 04 2015 Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRxx 015x Page 211 262 Note 2 the main steps the steps involving a physical modeling being referred to as AV have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity e Steps of the computation Step AV This step aims at calculating the sound power level radiated by duct or casing walls with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references AVI AV2 AV3 AVA Comments when used the duct or casing walls sound transmission loss referred to as TL out is selected according to various models as shown in the table below model source COPPA as derived amp displayed in worksheet COPPA COPPAI as derived amp displayed in worksheet COPPAI COPPA2 as derived amp displayed in worksheet COPPA2 CORED as derived amp displayed in worksheet CORED IN gt OUT COCID as derived amp displayed in worksheet COCID IN gt OUT BYO TL out figures to be entered by user BYO Bring Your Own when used the model of silencer i e the model o
284. number in the select 1 resp 2 to get for set 0 the same plate as for set 1 2 proposed list 1 resp set 2 Model of losses Select a model in the proposed list Model of effective critical Select a model in the frequency proposed list Number of identical plates Input a real positive number Input a real positive taken into account for the computation as a non zero Thickness number value only if a non zero value in cell just above Note temperature resp pressure of cell D6 resp D7 also apply to thin plates data of the third table below are not modifiable by the user despite the displayed color of the cell Item For test room conditions below temperature For test room conditions below pressure Cell for input Foreseen action Comment Input a real number common value applicable to the fluid to porous media to series cloths to perforated protection Input a real positive number common value applicable to the fluid to porous media to series cloths to perforated protection Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Worksheet in COSIL 1A o Input data Date 01 04 2015 Page 97 262 item Cell for
285. number of central splitters for mounting RPTR RPTL only N for a resonant silencer only number of central splitters for mounting RPTR RPTL only Q overall width overall height for mounting Q m Qm mass flow rate kg s Qv volume flow rate m3 s or m3 h or Nm3 h Sa for a resonant silencer only width between necks of chambers m Ss for a resonant silencer only width of necks of chambers m T for resonant silencers only period width such as T Ss Sa m Vf speed of airflow in the area Af m s Vf speed of airflow in the area Af m s Vp speed of airflow in the area Ap m s Ad for resonant silencers with a rear lining only thickness such as Ad d d m A d h Cf total pressure loss coefficient in relation with airflow speed Vf Cf total pressure loss coefficient in relation with airflow speed Vf Cp total pressure loss coefficient in relation with airflow speed Vp 0 angle of the branches of the Pine Tree spiltters Miscellaneous See also corresponding in General considerations and in Section 2 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 84 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si
286. o a degradation of the performance for frequencies possibly within the range of interest Attention has to be paid to the question of the possibility or not given the consequences in terms of construction modalities and corresponding costs of an inhibition of the axial wave propagation inside the lining with transverse solid partitions the case of an axial wave propagation inhibited by transverse very thick metal sheets with a very short distance between them acting as partitions is also referred to as ox1 oy1 oo whatever the properties of the absorber are else no such partitions is considered Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 72 262 Effects of the by pass correction illustration 1 5 4 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters having no transverse solid partitions being filled with a single porous medium homogeneous in directions parallel to and perpendicular to its surface having at room temperature a flow resistivity in the direction normal to the axis of the duct cy1 12000Nsm 4 a porosity 0 95 model M76 with a thickness d 0 1m and a length L 2m No series cloth is considered no ser
287. o be considered as a typical estimation of the reflection loss for a duct of dimensions comparable to testing facility mentioned in H2 when no accurate information is available regarding the higher order modes this is often the case particular cases for the mounting R the reflection loss is supposed in all cases to be equal to the reflection loss calculated for the mounting R all things being also equal for the mounting C1 C2 the reflection loss is supposed to be equal to the reflection loss calculated for the mounting R under the condition of an equal speed in the airways all things being also equal in case of A Af cf 1 1 for the mountings Q and CO no reflection loss has to be taken into account since A Af lt Af for the present revision of the software for the mounting RPTR resp RPTL the reflection loss is supposed in all cases to be equal to the reflection loss calculated for the mounting RPTR resp RPTL all things being also equal This step aims at taking into account the self noise of the silencer noise produced by the airflow For dissipative silencers o Bibliography references n 2 3 14 I5 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www i
288. ocial 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Worksheet in out COPPA for example 2 4 1b Page 144 262 See placemark model Select a model in the proposed list Item Foreseen action Input comment Size of the baffle in which the partition is symmetrically T i mounted along the x Input a positive real 4 5 direction Size of the baffle in which the partition is symmetrically T mounted along the z Input a positive real 3 5 direction Size of the partition along m 7 the x directi Input a positive real 1 Size of the partition along E he Schrei Input a positive real 1 Model for the calculation of Select a model in the 3 fll proposed list ns Select a value in the Fi min proposed list 5 625 Select a value in the Fi max proposed list 84 375 a Select a value in the Teta min proposed list 0 30 Teta max Select a value in the 89 375 30 proposed list Model for teta L Select a model in the 90 29 proposed list length of slit m Input a positive real 1E 50 31 width of slit m Input a positive real 1E 50 31 31 Worksheet in out COPPA0 for example 2 4 1b No inp
289. odel in mg FRO 22 proposed list Model for the flow acoustic Select a model in the 2081B 21 power proposed list Worksheet in out CODIS1 for example 1 4 1 only Cell for Foreseen action see Item input 1 3 Input See placemark 9n Select a model in the Condition of propagation proposed list ox1 oy1 1 8 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 60 262 Worksheet in out COPPA for example 1 4 1 and for example 1 4 2a and for example 1 4 2b Cell for Foreseen action see Item input 1 3 Input See placemark Size of the partition along Pa fies direction Input a positive real 1 Size of the partition along E the z direction Input a positive real 1 see 1 3 How to use SILDIS Operating conditions security level safet Screenshots of the worksheets for the example of computation Screenshot of worksheet in COALA for example 1 4 1 and for example 1 4 2a and for ee R example 1 4 2b Jre CER Lo uw sm pr rh AAA mem L 2 eq M t j v s js ry wat m mn sedna lonesome or DO ETE AFT wA feed se Im uv re vx Pe Maru sarsteri iz um er sire t
290. of the present user s manual it has not been checked in a satisfying way the accuracy of the software for models different of the model INT involved in the step P when the reference ORTHO is used for the plate o Bibliography references M 1 M2 L M3 M4 M5 M6 M77 M 8 o Comments The bending stiffness D x D zz in the direction x of highest bending stiffness of the plate about the zz axis about which the panel is the stiffest and the bending stiffness D z D xx in the direction z of lowest bending stiffness of the plate about the xx axis about which the panel is the least stiff of the equivalent plate referenced ORTHO are computed according various models as shown in the table below cf fig 2 10 model COR RIB CLA MOI Source M1 M1 9 S For the model CLA the bending stiffness are computed according various models as shown in the table below model Source SAY M 2 M3 HAN M6 M7 D x D zz and D z D xx are input data model COR model RIB model CLA i Fig 2 10 The following governing equation is considered with notations adapted from various sources will be specified on the occasion of a future revision of this user s manual w ew ew 25 ow Dii ad 2 Dnt2De alae Du 4 M P0 where Isolation Technologie Serv
291. oisson s ratio of the thin base plate The loss factor of the equivalent plate is set to the loss factor of the base thin plate Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 115 262 Step M This step being a complementary feature associated with step M aims at calculating the properties of damped plates made of a thin base plate and of an unconstrained layer of damping material in the acoustic structure extensional damping as shown of figure 2 8 below fig 2 8 Te base plate In order to include the calculations in the general layout of the program an equivalent series thin plate composite is considered referenced 2 PLY available in the list of thin plates of the worksheet in COALA for which the corresponding parameters are first derived from the input data of each layer of the composite by the use before using the worksheet in COALA of a complementary worksheet referenced in out CODAP COmputation of DAmped Plates damping plate o Bibliography references M 1 M 2 M3 o Comments The Young s modulus and the loss factor of the equivalent plate are computed according various models as shown in the table b
292. oles with an hexagonal arrangement diameter 3 mm open area ratio 20 3265 of thickness 1 mm general model MOI model for the added impedances ROA Illustration of the effect see below the prediction of the absorption coefficient at normal incidence without and with the perforated protection absorption coefficient at normal incidence alphaO 1 20 e without a with 1 00 1382 ne B ae 0 80 EM u amp 0 60 amp 2 S 9 0 40 Ld B 0 20 L v 0 00 T T T T 1 10 100 1000 10000 100000 f Hz f1 3oct Hz 25 315 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 5k 4k 5k 63k 8k 10k 12 5k 16k 20k without 0 07 0 10 0 14 0 18 0 22 0 27 0 30 0 34 0 37 0 39 0 42 0 45 0 49 0 53 0 58 0 62 0 67 0 72 0 77 0 82 0 85 0 89 0 91 0 93 0 95 0 96 0 97 0 98 0 98 0 99 with 0 07 0 10 0 14 0 18 0 23 0 27 0 31 0 34 0 37 0 39 0 42 0 46 0 49 0 54 0 58 0 63 0 68 0 74 0 79 0 84 0 89 0 92 0 94 0 96 0 96 0 94 0 90 0 83 0 75 0 65 Comment the choice of a perforated protection influences sometimes considerably the acoustic performance of the lining at least for some frequencies For a given geometry of holes and a given thickness a decrease of the open area ratio involves generally speaking a decrease of the performance In particular the choice of a perforated protection with an open area ratio too small compared with the optimum required as far as acoustics is concerned ca
293. on ratio of free bending waves simplified transmission factor for normal incidence no model of forced transmission INT for f fc model of resonant transmission 0 for f gt fc model of transmission INT The sound reduction index derived by the means of the present step is referred to as R dif assuming a diffuse field Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 126 262 In case of use of the model INT attention has to be paid to an appropriate selection of limiting angles for the angular integration in order to match field considerations o Remarks in relation with the angular integration in case of use of the model INT see corresponding at step P o Remarks in relation with the displayed results see corresponding at step P Step Q This steps aims at calculating the sound reduction index for coupling 100 without sound leaks o Bibliography references See comments below o Comments The approach of step P is extented to the case of a partition for which the behavior is only controlled by the total mass law The sound reduction index derived by the means of the present step is referred to as R stat o Remarks in relation with the angular
294. onsidered configuration Comments Input a comment Input a real positive To get fc Hz number Input a real positive To get fc h nibo If a particular value of fc no compulsory input data is wished If a particular value of fc h is wished Select a reference of layer in the proposed list for each layer of interest Reference of base plate Input a real positive The thickness of the plate used before profiling is Hines number considered not the overall thickness after profiling Select a model in the Model of orthotropic plate proposed list iw Input a real positive number 1 Input a real positive number Input a real positive for model RIB only number T Input a real positive for model CLA only number Surface density Input E 5 ORe mem T positi for model MOI only Overall thickness para o E number To get fcz Hz Input a real positive Ifa particular value of fc number is wished 385 Input a real positive If a particular value of Te ee kg Hz number M fcz is wished Input a real positive To get M 2n fcz Zo number Input a real positive do To get fcz d iub Input a real positive To get Zm M fez Zo muiiber If a particular value of M 2 ni fcz Zo is wished for model MOI only no compulsory input data If a particular value of
295. oposed list chA 55 Input a real positive 0 03 58 number Input a real positive 0 3 59 number Input a real positive 04 60 number Select a model in the proposed list for model CLA only 61 Select a model in the proposed list for model CLA only 61 Screenshots of the worksheets for the example of computation Screenshot of worksheet in out COORT for example 2 4 6 c Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 155 262 2 5 Illustrations of effects taken into account with SILDIS Introduction The prediction of acoustic performances of plane partitions with the software SILDIS is founded on a scientific and technical background as presented in 2 2 of this user s manual combining various knowledges in relation with physics Some future possible users may not be perfectly familiar with some aspects of this background in order to be anyway in a position of making the best use of this calculation tool attention has to be paid by such users to some particular effects taken into account for the predictions thanks to illustrations given in this section of the user s manual The intention is not to give a comprehensive list of the various effects of each parameter
296. or a rectangular duct 1 plate alone such as those of set 0 break in sound reduction index see lines 75 to 100 columns AA to AN Tables of results and graphs for a rectangular duct 1 steel plate alone thickness such as those of set 0 break in sound reduction index see lines 102 to 123 columns AA to AN Tables of results and graphs for a rectangular duct set 1 set 0 coupling 0 insertion loss see lines 125 to 145 columns AA to AN Tables of results for a rectangular duct TL out Rdif ILstat break in transmission loss see lines 147 to 151 columns AA to AN Tables of results for a rectangular duct Lw out break in sound power level see lines 156 to 160 columns AA to AN Tables of results for a rectangular duct Lw out break in sound power level see lines 162 to 166 columns AA to AN Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 3 4 Examples of computation with SILDIS Example 3 4 1 rectangular duct wall Envisaged application Page 182 262 It is wished to compute the breakout transmission loss of a rectangular duct wall for room conditions The duct is made of steel 1 with a thickness 0 567 mm 2 A cross section B 151 mm 3 H 151 mm 4 is considered Re
297. orber bulk reacting 6x1 oy1 variable being the general case including the previous cases the case of an axial wave propagation inhibited by transverse very thick metal sheets with a very short distance between them acting as partitions is also referred to as ox1 6y1 whatever the properties of the absorber are complementary definitions in relation with the cross section of the silencer the total number amp of cloths and perforated protections accounted as porous media i e not accounted as series cloth resp series perforated protections using electro acoustic analogies is considered Y with an old school approach 0 since cloths and perforated protections are accounted exclusively as series cloths and series perforated protections using electro acoustic analogies Y with a new wave approach 20 possibly if some cloths or some perforated protections are in some cases accounted as porous media consequently the following definitions apply ilim limit set index indeed limit between dlocal and hlocal see below with 1 lt ilim lt imax Y with an old school approach ilim imax Y with a new wave approach ilim has to be selected by the user such as ilim imax amp ilim dlocal such as dlocal di with d thickness of the porous medium of set i i l dbulk such as dbulk d1 thickness of porous medium of set 1 Numerical application for a dissipative silencer with a rectangu
298. orksheet in COALA Worksheet Suitable for mountings Input data Results in COALA all for sets for reference spectrum j particular conditions for the design of in COSIL all the silencer in out CODISI R R Cl C2 in out CODIS2 Q CO indicators of performance acoustics condition of propagation of sound in out COREPTR RPTR RPTR amp Aerodynamics in out CORESPTL RPTL RPTL Input data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with See corresponding in the chapter General considerations As far as porous media series cloths and series perforated protections are concerned specific data bases libraries will allow the design to be made with in built engineering data constants referred to as Usual in the worksheets of the software Warning some properties of the presently referenced materials still not have been checked by reliable sources See also report PhRXX 015 Collection of soundproofing constructions systems a companion to User s manual for the software SILDIS for porous media v contents of the library 21 possible references of material layers for series cloths v contents of the library 21 possible references of material layers Note the cloth referenced RESISTAIR can be used with an appropriate value for the flow resistance for the simulation of los
299. orous medium in the direction parallel to the axis of the duct ox1 6y1 absorber locally reacting ox1 6y1 1 absorber bulk reacting 6x1 oyl var with var 0 5 Illustration of one of the effects see below the prediction of the propagation loss depending on the conditions of propagation of sound inside the porous medium see key in the graph longitudinal attenuation Da L 120 oxl oyl 9 Boxli oyl 1 oxt oyl var 100 Vm e E o 80 ar on M S 60 T 5 rs CE i A 40 A 20 2 ay e v A on 0 1 10 100 1000 10000 100000 f Hz fil8oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000 20000 oxtoyiz 0 1 01 02 03 05 08 12 20 31 49 7 7 12 2 19 4 306 47 1 688 91 2 102 5 99 0 95 0 99 2 92 5 546 364 222 137 84 52 32 20 oxt oyi 1 0 1 02 03 05 07 1 1 18 28 44 67 10 1 150 22 1 31 6 436 58 0 740 886 928 854 76 5 66 5 508 343 226 149 99 65 43 29 oxtloyt var 0 2 02 04 06 10 15 23 36 55 82 118 165 227 302 38 9 490 608 743 848 804 694 586 47 1 344 236 159 107 72 48 33 Comment the conditions of propagation inside the porous medium of the lining influences sometimes considerably the acoustic performance of the silencer at least for some frequencies In particular an overestimation of the not always known flow resistivity of the porous medium in the direction parallel to the axis of the duct can lead t
300. os Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 99 262 insertion loss with flow and self noise Di see line 162 per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum acoustic power without silencer Lw0 and acoustic power with silencer including self noise Lw1 versus frequency see lines 164 to 184 columns A to F per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum insertion loss with flow without self noise Di and insertion loss with flow and self noise Di versus frequency see lines 164 to 184 columns G to L per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum 14 4 Examples of computation with SILDIS Example 1A 4 1 dissipative silencer with a rectangular cross section Envisaged application It is wished to compute the acoustic and aerodynamic performances of a dissipative silencer with a rectangular cross section width B 1200mm 1 height H 1200mm 2 length L 1000mm 3 having rectangular edged 4 splitters of thickness 2d such as 2d 2d 1 398 6mm 5 with a open area ratio of 55 5 6 made of one 7 inhomogene
301. otection is considered Illustration of one of the effects see below the prediction of the propagation loss depending on the temperature see key in the graph propagation loss Da 120 20 C 300 600 100 80 EP E SA m 60 3 a a E m a 40 VU A is 5 20 ene a id e 0 T r n nnno ren n n 1 10 100 1000 10000 100000 f Hz f1 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k 20 C 0 0 01 01 01 02 03 05 O09 14 23 38 63 105 175 295 49 9 80 5 999 770 590 550 629 327 208 150 84 55 34 21 13 300 C 0 0 Of 01 01 02 03 05 08 13 20 31 49 76 116 179 265 373 48 4 56 5 597 61 2 656 703 487 31 1 194 116 71 44 27 600 C 00 01 01 01 02 03 05 08 13 20 30 45 67 9 7 134 178 227 287 344 404 46 1 53 8 636 690 535 334 197 118 70 43 Comment the temperature of the application influences sometimes considerably the acoustic performance of the silencer at least for some frequencies For a given material an increase of the temperature involves generally speaking an increase of the flow resistivity everything else supposed to be equal In particular the choice of a flow resistivity of the porous medium at room temperature too big compared with the optimum required at the temperature of the application as far as acoustics is concerned can lead to a degradation of the performance for frequencies possibly
302. ounting CO Note 7 comments for resonators a complementary step referred to as L is necessary between step E and step F allowing the computation of the admittance in the plane of the outlet side of the neck of the chamber e Steps of the computation Step A This step aims at taking into account what is on the back i e at the rear of the acoustic structure o Bibliography references AI o Comments No comment Step B This step aims at taking into account porous media used in the acoustic structure Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report PhR15 008A o Bibliography references Fig 1 5 Date 01 04 2015 porous medium Page 36 262 B1 B2 B3 o Comments The following governing equation is considered in the absorber layer with notations adapted from various sources will be specified on the occasion of a future revision of this user s manual Where eg Lax Ox pa pressure Pa t time s e Tay Ox 1 p yt 0 Ta propagation constant in the x direction rad m Tay propagation constant in the y direction rad m depending on the used model some of the
303. ous in directions parallel to and perpendicular to its surface bulk absorber 8 having the reference DISP resp DISN in the database for porous media of SILDIS 9 with 10 a cloth of thickness d 1 0 5 100 mm 11 having the reference DIS in the series cloths database of SILDIS 12 with a perforated protection of thickness d 1 0 7 mm 12bis with holes diameter 3 mm spaced by a distance 5 mm with an hexagonal array referred to as R3T5in data base 13 It is foreseen to use the silencer with an air flow rate of 32 645 kg s 14 at 20 C 15 at a pressure of 101325 Pa 16 It is decided to not take into account a limitation of the propagation loss for L gt 1m 17 and to not take into account the reflection loss 18 The reference spectrum is supposed of the type pink noise 19 with a sound power level of 130 dB oct 20 It is chosen to predict the self noise of the silencer in the way described with the model referred to as 2081B 21 It is chosen to predict the back pressure with the model referred to as FRO 22 Input data The input data required for the computation are listed hereafter in reference with the above data see figures in brackets in the previous used as placemarks for explaining the selection below The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge
304. p Vf C 0 5 p VE Apt total pressure loss Pa p density of fluid kgm 3 Vp speed in the area Ap ms 1 Vf speed in the area Sf ms 1 Vf speed in the area Sf ms 1 insertion loss without flow see line 105 per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum Note those results are intermediate complementary results not equal generally speaking to the insertion loss with flow and self noise that the user has to use as the only reliable indicator of performance of the performance of the silencer Those results are only displayed in order to allow the evaluation of the impact of airflow other than self noise by the means of a comparison with results displayed line 106 insertion loss with flow without flow noise Di see line 106 per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum Note 1 those results are intermediate complementary results not equal generally speaking to the insertion loss with flow and self noise that the user has to use as the only reliable indicator of performance of the performance of the silencer Those results are only displayed in order to allow the evaluation of the impact of airflow other than self noise by the means of a comparison with results displayed line 105 of flow noise by the means of a comparison with results displayed l
305. pW t time s Set of materials ilim limit set index imax maximum set index amp total number of cloths and perforated protections accounted as porous media i e not accounted as series cloth resp series perforated protections using electro acoustic analogie Dry air a diffusivity m s c adiabatic velocity of sound ms Cp specific heat capacity at constant pressure J kg K G adiabatic compressibility Pa Cr isothermal compressibility Pa k wave number rad m Ks adiabatic bulk modulus Pa Kr isothermal bulk modulus Pa t temperature C P static atmospheric pressure Pa Pr Prandtl number R gas constant J kg K V volume m Z characteristic impedance Nsm p coefficient of thermal expansion T propagation constant rad m n dynamical viscosity Nsm thermal conductivity W m K wavelength m v kinematic viscosity m s p density kg m3 subscript superscript subscript superscript for normal conditions 0 N for test room conditions 0 5 on front atmosphere 0 for service conditions rear atmosphere 0 uid Porous media a a coefficients for the expression of Dan b b coefficients for the expression of Zan Ci C2 C3 C4 C5 C6 C7 Cg coefficients for the expression of L an and Zan Cserr adiabatic compressibility Pa E non dimensional parameter related to frequency flow resistivity
306. placemark input comment Temperature Input a real number 17 1 Pressure Inputa real positive 100000 2 number Select a reference Reference material in the proposed STEEL 3 list Select 1 or 2 in the 1 E proposed list Model of effective critical Select a model in the NAT 4 frequency proposed list Thickness Inputa real positive 0 00065 5 number Reference acoustic power t s 73 6 61 6 49 5 44 0 11 spectrum p 38 3 33 8 35 5 30 5 Worksheet in out COCID IN gt OUT frequency fRokt proposed list Item Cell d Foreseen action Input See placemark input Diameter D Input a positive real 0 25 6 Length L Input a positive real 1 7 Mass flow rate Input a positive real 1400 3600 AH58 Model of cut off frequency Select a model in the fco proposed list model of annular expansion Select a model in the NAT model of HF limitation Select a model in the MOI 91 proposed list model for Rdif Select a model in the 2 proposed list Only if one wishes to use the sound power level transmitted by the walls of a circular duct wall is displayed in worksheet in out COCID IN gt OUT Item Cell for Foreseen action Input See placemark input Select a model in the model proposed list 9 Worksheet in out COBON Item Cell tor Fores
307. plate indeed 1 or several identical thin plates treated as a whole Note 1 element can consist of 1 or several acoustic layer s each examples a pair of identical plates with a negligible interspace is 1 element consisting of 2 acoustic layers a plate with an extensional damping is 1 element consisting of 2 acoustic layers etc Set of elements stacking of several elements gathered for a sake of simplicity of implementation use of the software sometimes reduced tol element The position rank of each element is constant within each set Note 1 for dissipative silencers each set indexed from an impervious rigid back at the rear to the front 1 to 4 consists from the rear to the front of up to 1 porous medium up to 1 cloth up to 1 perforated protection Note 2 for plane partitions each set indexed from the rear to the front 1 to 4 consists from the rear to the front of up to 1 porous medium up to 1 cloth up to 1 perforated protection and up to 1 or several identical thin plate s A complementary set set 0 is used at the rear of set 1 consisting of up to 1 thin plate indeed up to 1 or several identical thin plates treated as a whole backed by atmosphere or backed by an impervious rigid wall Remark for the set 0 the number of identical plates only can be freely selected by the user the material and the thickness being selected by the user among those of the plate s of the set 1 or of the set 2 Maximum set index
308. porous medium having at room temperature a flow resistivity in the direction normal to the axis of the duct oy1 72 kNsm 4 a porosity 0 95 model M76 with a thickness ds 0 02m No series cloth is considered no series perforated protection is considered a core layer being a porous medium having at room temperature a flow resistivity in the direction normal to the axis of the duct 6y1 12 kNsm 4 a porosity 0 95 model M76 with a thickness de 0 08m No series cloth is considered no series perforated protection is considered Illustration of one of the effects see below the prediction of the propagation loss of the mix laminated lining and the comparison with a non laminated lining made with a thickness d ds dc 0 10m either 100 of the material of the surface layer or 100 96 of the material of the core layer see key in the graph propagation loss Da Da dB m 1 10 100 1000 10000 100000 f1 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k 12kNsm 4 0 1 02 03 04 07 11 17 27 43 68 107 163 232 296 327 322 316 337 322 199 127 78 47 29 18 1 07 04 03 02 72kNsm 4 0 5 08 11 16 21 26 32 38 43 49 55 63 73 86 102 124 154 195 247 299 250 132 71 39 23 13 08 05 03 02 mix 03 05 08 12 18 26 37 49 61 74 86 95 103 109 115 123 139 172 225 284 268 133 70 39 23 13 08 05 03 02 Comment in case of a laminated lining the choice of the flo
309. pressure loss calculated for the mounting R under the condition of an equal speed in the airways all things being also equal Furthermore a complementary model 2081C1 applies for mounting C1 only not for other mountings indeed according 06 for the mounting C1 with A Af lt A see 1 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 51 262 Y forthe mountings of the worksheet CODIS2 Q CO the determination of the total pressure loss is done is done according various models as shown in the tables below Model IDE source 05 Y for the mountings Q CO the determination of the total pressure loss is done A Af lt Af for the present revision of the software Y for the mountings RPTR RPTR RPTL RPTL the determination of the total pressure loss is done is done according various models as shown in the tables below Model IDE source a8 for the mounting RPTR resp RPTL the total pressure loss is supposed in all cases to be sufficiently close to the total pressure loss calculated for the mounting RPTR resp RPTL all things being also equal In case of rectangular silencers the obtained results are compar
310. procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss MODULE 2 prediction of acoustic performance of plane partitions for an acoustic structure including up to 2 porous media up to 2 series cloths up to 2 series perforated protections up to 2 sets of identical series thin plates with up to 1 complementary rear set of identical series thin plates selected among a library including for each kind of layer more than 20 referenced materials with an atmospheric back or with an impervious rigid back The results of the calculations are comparable with the standardized measurement in case of an atmospheric back see NF EN ISO 10140 2 Acoustics Laboratory measurement of sound insulation of building elements Measurement of airborne sound insulation and in case of rigid impervious back see NF EN ISO 354 Acoustics Measurement of sound absorption in a reverberation room and also ISO 10534 1 Acoustics Determination of sound absorption coefficient and impedance in impedance tubes Part 1 Method using standing wave ratio MODULE 3 prediction of acoustic performance of duct walls either with a rectangular cross section or with a circular cross section including folded spiral seam ducts The obtained results are not comparable with standardized measurement due to the lack of documents formalizing corresponding measurement procedures Isolation Technologie Services SARL au capital de 7
311. pt mn and s sen ha n Zi i m pere alee en merde L on ma m ae x A 3 en BM went deren ote me e tiet nt Oy Loy ge fon pe te me plane n etit np it Dn LL 22 P P8 omm r TL LCI EE on v CO mm Ooth Deed boven or Compan f leer Cm NI 0 1 9 D 00 D 0 D je D He D De 7 2 1 O 1 9 I fe sm LI Iu I ls I zw DI Huy ur m pe mu I wm D UM D WI m Mn ies teens de SOO UR T D COUT AN CORE Na Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 187 262 Screenshot of worksheet in out COCID IN gt OUT Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 188 262 Example 3 4 3 circular duct wall spiral seam pipe Envisaged application It is wished to compute the breakout transmission loss of a circular duct wall spiral seam pipe for room conditions temperature 17 C 1 pressure 1E5 Pa 2 The duct is made of steel 3 for which the natural effective critical frequency is con
312. r example 1 4 1 Worksheet in COSIL for example 1 4 2a only Cell for Foreseen action see Item input 1 3 Input See placemark Limit set index ilim D18 Taper an poc donde 1 7 imax Mounting Q to get Q m AQ24 Input a positive real 1 100 1 Airway h m D25 Input a positive real AQ25 i e 0 44995 Mass flow rate D37 Input a real 24 1 14 Width poy D43 Input a positive real AQ43 i e 0 99493 Height H mi D44 Input a positive real AQ44 i e 0 99493 Length L m D45 Input a positive real 1 5 3 Model of by pass correction F51 Select a model in the FRO 17 for L 1m proposed list Roughness of lining AW61 Input a real 0 001 23 Model for the flow acoustic AW65 Select a model in the 3733B 21 power proposed list Worksheet in out CODIS2 for example 1 4 2a and for example 1 4 2b only Cell for Foreseen action see Item input 1 3 Input See placemark Select a model in the m Condition of propagation W182 proposed list ox1 oy1 1 8 Worksheet in out COPPA for example 1 4 2a See corresponding for example 1 4 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 64 262
313. r the software SILDIS data base library for porous media v contents of the library 1 possible reference of material layer data base library for series cloths v contents of the library 1 possible reference of material layer data base library for series perforated protections v contents of the library 1 possible reference of material layer some alerts in case of input data involving a warning of the user o the place where and the way some results are presented Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report PhR15 008A Date 01 04 2015 Page 95 262 Those key points are reviewed worksheet per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA 1A o Input data Item Language Date Project Title Temperature Pressure Maximum set index imax Reference Thickness Reference Incorporation of the series perforated protection 0 1 Thickness Reference Incorporation of the series cloths 0 1 Thickness Lw0 only known per 1 1 octave frequency band 0 1 LwO LwO C
314. ral model for R K81 Sura modd um the TE proposed list model of forced transmission E85 Selecta model in the Fr proposed list model of resonant E90 K90 Select a model in the transmission Ju proposed list model of transmission E95 K95 Seles meds ug the SE proposed list Select a number of 1 3 frequency range where f fc E99 K99 oce bands Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report PhR15 008A o Comments Date 01 04 2015 Page 136 262 Item Cell Foreseen action Comment In case of such an alert the accuracy of the program STOP 3 PLY L81182 2 with all the models has not been checked In case of such an alert the user has to be prepared to not exact for f fc C86 D86 get approximate results below the frequency displayed due to imperfections of the chosen model STOP valid model NII B87 In case of such an alert the model has to be changed for the same model as in cell E90 STOP valid model ND D87 E In case of such an alert the model has to be changed for the same model as in cell E90 STOP radiation ratio not In case of such an alert the input data of cell K77 has to D91 valid be changed STOP radiation rat
315. rallel to the axis of the duct is referred to as x the direction normal to the axis of the duct along the thickness of the lining is referred to as y according to the fig 1 3 below example for a mounting R In case of a rectangular silencer the direction perpendicular to x and y is referred to as z according to the fig 1 3 below not considered for the computation with SILDIS fig 1 3 For resonant silencers the various mountings for which predictions can be done with the software SILDIS are shown in fig 1 4 and fig 1 5 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date PhR15 008A 01 04 2015 T Lu y Y mounting RPTR ry HN Y mounting RPTR lt gt A A Y Y Y Y Y mounting RPTL 4 ET mounting RPTL Key of the previous figures d 2d 2 thickness of extreme inner lagging for mountings RPTR RPTL only 2d thickness of central splitters h 2h 2 width of extreme air way for mounting RPTR RPTL only 2h width of central airways L length of the silencer without aerodynamic extremities N number of central splitters for mounting RPTR RPTL only N B 2 d h N number of central splitters for mounting R only
316. rence spectrum one should enter in worksheet in COALA Worksheet Suitable for mountings Input data Results in COALA all for sets for reference spectrum for dimensions for models of in COBON all computation Input data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with o the input data See corresponding in the chapter General considerations o some alerts in case of input data involving a warning of the user o the place where and the way some results are presented Those key points are reviewed worksheet per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in out IDS page 1 o Input data Item Cell tor Foreseen action Comment input Sound power level radiated U17 to Pitera geal by components walls _AC26 s U38 to If no input in AD38 resp AE38 displayed value is Lwoitret dB ret 1pW AE38 Input teal computed from 1 1 octave bends input data U4Sto Lpoutcalc Lwoutcalc dB US Input a real U88 to If no input in AD88 resp AE88 displayed value is Lpoutret dB ref 20yPa AE88 Input areal computed from 1 1 octave bends input data T113 to gt Comments TI22 Input a string o Main displays of the results
317. rent definitions of reference conditions being more or less currently used all over the world For the purposes of the present user s manual the following terms and definition apply Normal conditions set of conditions including a temperature to 0 C and a pressure Po 101325 Pa Note with the software SILDIS flow rates expressed in Nm3 h are related to normal conditions Test room conditions i e typically encountered in a room conditions for which measurement of engineering data of materials porous media cloths perforated protections plates are usually sometimes implicitly performed namely with a temperature to generally not too far from 20 C with a pressure Po generally not too far from 10 Pa and with an air speed not too far from 0 m s Note 1 in the worksheets of the software and consequently in the present document usual refers to input data for test room conditions Note 2 a unique i e common value of temperature and a unique i e common value of pressure being input data themselves in order to allow to some users a fine tuning in some circumstances are assumed for all usual input data Service conditions conditions for which the design of the envisaged soundproofing equipment is performed possibly influenced by various changes when compared to test room conditions notably with a temperature sometimes far away from test room temperature or and with a pressure sometimes far away from test
318. res MODULE 8 prediction of the sound impact of duct systems including components such as silencers dissipative or resonant straight ducts sections bends with a rectangular cross section or with a circular cross section or with mixed cross sections for some components MODULE 9 modelling of sound decay in enclosed spaces The obtained results are comparable with standardized measurement cf NF EN ISO 3382 2 Acoustics Measurement of room acoustics parameters Part 2 reverberation time in ordinary rooms In this user s manual a presentation of this calculation program is made for the people concerned at ITS or elsewhere by the design of soundproofing equipment related to applications in the field of industry environment as well as building To be continued work in progress Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 3 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 4 262 Contents page General
319. rflow in the area Ap m s A d h Cf total pressure loss coefficient in relation with airflow speed Vf Gf total pressure loss coefficient in relation with airflow speed Vf Cp total pressure loss coefficient in relation with airflow speed Vp Miscellaneous See also corresponding in General considerations Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 106 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 107 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 108 262 Section 2 computation of plane partitions MODULE 2 of the software 2 1 Introduction Terms and definitions For the needs of the present user s manual the fo
320. riate separate predictions to the smallest amount necessary for the best use some features to not be available because not 10096 implemented or not sufficiently verified some features may also be available although not 100 verified indeed In order to include the calculations in the general layout of the program some models associated with known bibliographic sources have not been used despite their level of interest from an academic point of view SILDIS is sometimes based on simplified although rarely simple methods of computation satisfying the requirements of the conditions of implementation and hopefully the requirements of the conditions of use of the program All unfavorable cases involved by the non limitation of the input data for different models are not always known with accuracy In case of an evaluation of an indicator of performances done thanks to several separate predictions the preferred models at the time of the writing of the author of this manual are written in bold and underlined like this for the model MOD MOD SILDIS is a tool supposed to be shared by users being more or less experienced in computational noise control engineering involving possibly for some users the feeling that some elements in this manual are not very familiar for them Should this happen those users would consider that such elements are dedicated to other users and would kindly focus on data foreseen to be entered by them in the software an
321. ros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Date Page 01 04 2015 130 262 in out COPERF 34 m inout COPPA in out CODAP gt gt in out COPPAO in COALA Fig 2 11 in out COORT in out COPPA1 in out COPPA2 Note concerning the worksheet in COALA a rear atmosphere or an impervious rigid back are displayed to be selected by the user depending on the conditions of the application for which the simulation is performed Worksheet Suitable for mountings Input data Results in out COPERF perforated plates for base plate some of the parameters of the equivalent plate in out CODAP damped plates for layers of the composite some of the parameters of the equivalent plate in out COORT orthotropic plates for the base plate and the geometry some of the parameters of the equivalent plate in COALA in out COPPA all all i e for the total acoustic structure as selected with an impervious rigid back or with an atmospheric back as selected for elements of sets for for limits of integration for dimensions reference s pectrum sound absorption and sound transmiss
322. rtitions inhibiting the sound propagation along the duct axis inside the non laminated lining consisting of a single porous medium homogeneous in directions parallel to and perpendicular to its surface having a flow resistivity cy 22332Nsm 4 a porosity 6 0 95 model M76 with a thickness d 0 05m The cloth consists of an impervious membrane surface density 125 g m2 Illustration of the effect see below the prediction of the propagation loss without and with the cloth propagation loss Da without Da dB m 1 10 100 1000 10000 100000 f1 3oct Hz 25 315 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 16k 2k 2 5k 315k 4k 5k 63k 8k 10k 12 5k 16k 20k without 01 Of 02 03 05 08 12 19 29 45 68 101 149 213 294 391 498 594 620 571 51 1 445 343 232 152 100 66 44 29 19 with Ot Of oa os 05 08 12 20 82 52 85 137 223 i SLI 570 30 7 17A 103 64 AT 256 28 10 06 pA 03 9 2 i Gil Comment the choice of a series cloth influences sometimes considerably the acoustic performance of the silencer at least for some frequencies In particular the choice of a permeability of the cloth too small compared with the optimum required as far as acoustics is concerned can lead to a degradation of the performance for frequencies possibly within the range of interest an increase of the performance being often obtained at low frequency due to the presence of a free vibrating foil Attention has to be paid to the consequences of
323. s as well as reference spectrum one should enter in worksheet in COALA Worksheet Suitable for mountings Input data Results in COALA all for sets for reference spectrum COmputation of NOZzle ns S in out CONOZ flecti dimensions indicators of performance acoustics reflection Input data alerts and results the key points The best use of the software requires the knowledge of some key points in relation with o the input data See corresponding in the chapter General considerations o some alerts in case of input data involving a warning of the user o the place where and the way some results are presented Those key points are reviewed worksheet per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in out CONOZ o Input data Item bun tor Foreseen action Comment input mass flow rate Qm kg s I5 Input a real model of cut off frequency Select a model in the P5 fco proposed list model of reflection loss V5 events model in the proposed list Solid angle factor P7 Input a positive real Only in case of rectangular cross section Item bun tor Foreseen action Comment input biggest dimension a m P23 Input a positive real smallest dimension b m P24 Input a positive real Only in case of circular cro
324. s ci LI 3 0 00 aai 1 10 100 1000 10000 100000 f Hz f1 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k 100kPa 0 05 0 08 0 11 0 16 0 21 0 27 0 33 0 39 0 43 0 47 0 50 0 54 0 57 0 61 0 65 0 70 0 76 0 80 0 84 0 88 0 90 0 93 0 94 0 96 0 97 0 98 0 98 0 99 0 99 0 99 200kPa 0 03 0 04 0 07 0 10 0 15 0 21 0 29 0 38 0 48 0 56 0 64 0 69 0 75 0 79 0 82 0 84 0 87 0 90 0 93 0 95 0 96 0 97 0 98 0 98 0 99 0 99 0 99 1 00 1 00 1 00 400kPa 0 01 0 02 0 04 0 06 0 09 0 13 0 19 0 28 0 39 0 52 0 65 0 77 0 86 0 92 0 95 0 95 0 95 0 94 0 96 0 98 0 98 0 99 0 99 0 99 1 00 1 00 1 00 1 00 1 00 1 00 Comment the pressure of the application influences sometimes considerably the acoustic performance of the lining at least for some frequencies Depending on the frequency range of interest absorbers with a higher flow resistivity may be selected in case of pressure lines But the choice of a flow resistivity of the porous medium too big compared with the optimum required at the pressure of the application as far as acoustics is concerned can lead to a degradation of the performance for frequencies possibly within the range of interest This comment would also apply for the absorption coefficient for a statistic incidence See also the last paragraph of illustration 2 5 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450
325. s of elements is considered for the computation the sets being indexed from an impervious rigid back to the front airway side 1 to 4 set 4 set 3 set 2 set 1 A 0 A symetry plane impervious rigid back fig 1 10 each set consists from the rear to the front of up to 1 porous medium up to 1 series cloth and up to 1 series perforated protection the series concept being in relation with electro acoustic analogies basing equivalent network see figure 1 11 below set 1 to 4 zoom m fig 1 11 DEN series perforated protection porous medium series cloth the surface impedance of the acoustic structure with an impervious rigid back is calculated above the set imax the COmputation of the DIssipative Silencer is performed for an acoustic structure with an impervious rigid back including sets from 1 to imax with 1 lt imax lt 4 The less complicated models available for taking into account the physical properties of a porous medium are based on the hypothesis of homogeneity in directions parallel to and perpendicular to the surface of the material i e same properties in directions x y and z But some porous media including some stone wools some glass wools are known to be non homogeneous in directions parallel to and perpendicular to the surface of the material having in particular an airflow resistivity normal to laminae of fibers ow and an airflow resistivity parallel to laminae of
326. s of the worksheets for the example of computation 145 Example 2 4 2b double leaf partition ssssssssssssssseeeeeeeeenneeeen emere rennen nnne 146 Envisased application ni onere pee vet ne ete etude tpe etes 146 Input data oS eR ee Ee E 146 Screenshots of the worksheets for the example of computation 149 Example 2 4 3 perforated plate ss 150 Envisaged application m9 hen Reeteen pedea ded er eee oe S ce et Coe E ed 150 Input data teet eet e ete eee e eee ete stat 150 Screenshots of the worksheets for the example of computation sene 151 Example 2 4 4 plate with an extensional damping seen 151 Envisaged application 5 2 nnebgue sho gent hosing the oi a E tye oTastatassena Me cTesgansase bte iere 151 Input data testi Vau e RUSO IEEE ORTOS UE OS 151 Screenshots of the worksheets for the example of computation 152 Example 2 4 5 plate with a constrained damping sse nee 152 Envisaged application nn tet ute bes tbe oi mre I EIE leche 152 Input data 6h din AN en At ree tese tee edt et eee te t e te utet 152 Screenshots of the worksheets for the example of computation 153 Example 2 4 6 orthotropic plate 5 eet ee are ck te ete E e e
327. s perforated protection 77 Effects of the velocity of air flow other than regenerated noise 78 Effects of the velocity of air flow regenerated noise 79 Effects of the unsilenced sound power spectrum and of other uncertainties 80 Appendix to Section 1 list of symbols sse 81 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 6 262 Section 1A computation of silencers with discontinued splitters MODULE 1A of the software 1A 1 Introduction users 85 Terms and K C ETECO IEE 85 Mountings and geometry 85 1A 2 Scientific and technical background 7 sss 86 1A 2 1 Thermodynamics and fluid dynamics sssssssssssssssssseeeeeeeeeen emere nemen 86 Steps of the computation se 86 DA 3232 A COUSUICS iioii ed aede eoe ede ed onde eae E S E 89 Bloc diagram for rectangular dissipative silencers eeseeeeeeeeeeeneeneen nennen 89 Steps of the coniputati n oec erp saei iio pe e Pepe DERE Ne Lea erba E ESAE R RE FREE le
328. s shown in the table below model HAN NAS SMA Source ACI AC3 AC4 ACA seems to be in error Step AC This step being a complementary feature associated with step X aims at calculating the sound reduction index of a single leaf rectangular duct made of 1 steel plate alone with a thickness such as those of set 0 regardless of the other selected parameters of such plates for set 0 regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references AC AC2 o Comments the model of ratio a b is selected as shown in the table below whatever the corresponding input data of a and b are model 1 2 4 source a b 1 a b 2 a b 4 Step AE This step aims at calculating the insertion loss of set 1 when compared to set 0 with atmosphere at the front and at the rear regardless of the selected input data Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 171 262 o Bibliography references AE1 o Comments Cf step
329. s step aims at calculating the sound pressure level downstream at the specified distance of the duct system o Bibliography references BABI o Comments The sound pressure level downstream of the full duct system at a specified distance Lp1calc in dB ref 120uPa is basically computed at frequency steps of 1 1 octave as Lplcale Lwlcalc Lplcalc Lwlcalc DI DI 8 2 3 Acoustics regarding the transverse noise propagation i e for the computation of the sound power level transmitted by the walls of the duct system e Bloc diagram on fig IDS 2 below the components of the system are referred to as C1 to C10 wo E gt ic 9 C10 e 1202005001 I SS RM Eig Note 1 the service conditions dependence has been omitted for the sake of simplicity See report PhRxx 015x Fig IDS 2 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 241 262 Note 2 the main steps the steps involving a physical modeling being referred to from AAB to AAB have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity e Steps of the comp
330. sake of simplicity See report PhRxx 015x Note 2 the main steps the steps involving a physical modeling being referred to from A to AL have been taken into account for the bloc diagram above some of the parameters of the above bloc diagram are not independent the frequency dependence has been omitted for the sake of simplicity Steps of the computation for circular duct walls break out noise Steps A to V See corresponding in Section 2 as far as sound reduction index of plates is concerned use to be pr cised on the occasion of a future revision of this user s manual Preliminary remarks common to step AH and step AH o Comments the size of the cross section of the duct the length of the duct the flow rate are not related to the values selected in the worksheet in out COSIL for D corresponding input data are entered in worksheet in out COCID IN gt OUT Step AH This step aims at calculating the sound reduction index of a single leaf circular duct made of 1 layer alone such as plates of set 0 regardless of the selected quantity of such plates for set 0 regardless of the selected quantities of other elements and with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references AH1 AH2 AH3 o Comments when used the cut off frequency for the first higher mode fco is computed depending on the speed of sound c th
331. se 196 Step AU insertion loss with flow noise 196 4 3 How to use SIL DIS scootititiedn iu isin INTE pU EH tU PON UOS EURO EE don 197 Operating conditions security level safety esssssseeeeeeeeeeeeeennen nee 197 lcm 197 Input data alerts and results the key points 197 4 4 Examples of computation with SILDIS sse 199 Example 4 4 1 rectangular straight duct air conditioning system see 199 Envisaged application coco epe pte be uta ure tiennent lin tit tient te 199 Input data ub E HEIDE mo P Hd 199 Screenshots of the worksheets for the example of computation eseee 200 Example 4 4 2 circular straight duct air conditioning system seeeee 201 Envisaged applicati n 2 cine erede ente Oare Nar EEE ESAO ESA NESE ED a aiaa 201 linm A A A 201 Screenshots of the worksheets for the example of computation eseeen 203 Example 4 4 3 circular straight duct exhaust stack sesseeeeeeeeneenneen een 204 Envisaged application e osee Ieri M rere Re rbi pub ie ee e rero te t eb dae 204 Input d ta encre nd eter eR eer E epee 204 Screenshots of the worksheets for the example of computation sse 205 Appendix to Section 4 list of symbols sss 206
332. sed on explicit reverberation time allowing a direct calculation of reverberation time e Steps of the computation Step a Cf section 1 Steps N O Cf section 2 Step BAD This step aims at calculating the walls floor amp ceiling absorption area o Bibliography references BADI BAD2 o Comments the absorption coefficients alpha of walls floor and ceiling are accounted as shown in the table below model NAT MOD source BADI BAD2 MODified NATural i e absorption Comment as entered as coefficients Sabine s in order to coefficients limit them to 100 96 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 253 262 Step BAE This step aims at accounting atmospheric absorption o Bibliography references BAEI o Comments the atmospheric absorption area is computed using an attenuation coefficient of sound power in air accounted for climatic conditions as shown in the table below Temperature C Humidity ratio 30 50 10 50 70 70 90 30 50 20 50 70 70 90 Step BAF This step aims at accounting objects fitting absorption area o Bibliograp
333. sense Step P This steps aims at calculating the sound reduction index for coupling 0 without sound leaks o Bibliography references P1 P2 P3 P4 P5 P6 o Comments The transmission loss for a statistic incidence derived by the means of the present step is referred to as R stat 10log tstat where tstat is the transmission factor for a statistic incidence o Remarks in relation with the angular integration see Geometry in Section 2 The transmission factor for a statistic incidence is calculated per frequency band by angular integration according to the generalized customized formula below see notations farther min 0max 0L 1 9 0 cos 0 sin 0 dO Omin tstat min 0max OL cos 0 sin 0 dO Omin with the notable exception of the model DAV where the denominator is replaced by 0 5 with respect to the orientation angle q the integration is performed from min to pmax as selected by the user in order to match field considerations in a proposed list for the present version of the program angles from 5 625 to 84 375 with a step of 11 25 i e N 8 angles Recall orientation angle is of interest in case of an orthotropic plate included in the acoustic structure regarding the incidence angle 0 the integration is performed from Omin to min 0max OL Omin and Omax are selected by the user in order to match field considerations in a proposed li
334. ser despite the displayed color of the cell o Main displays of the results total pressure loss see lines 98 to 100 Note the following equation is considered for the definition of total pressure loss coefficients Gf Gf Gp Apt Cp 0 5 p Vp 2 Cf 0 5 p Vf C 0 5 p Vf Apt total pressure loss Pa p density of fluid kgm 3 Vp speed in the area Ap ms 1 Vf speed in the area Sf ms 1 Vf speed in the area Sf ms 1 insertion loss without flow see line 105 per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum Note those results are intermediate complementary results not equal generally speaking to the insertion loss with flow and self noise that the user has to use as the only reliable indicator of performance of the performance of the silencer Those results are only displayed in order to allow the evaluation of the impact of airflow other than self noise by the means of a comparison with results displayed line 106 insertion loss with flow without flow noise Di see line 106 per 1 1 octave frequency band and in terms of A weighted global value with reference to the reference acoustic power spectrum Note 1 those results are intermediate complementary results not equal generally speaking to the insertion loss with flow and self noise that the user has to use as the only reliable indicator of performance of the performance o
335. ses of a thin plate for example at normal incidence due to the conditions of mounting data base library for series perforated protections v contents of the library 21 possible references of material layers some alerts in case of input data involving a warning of the user o theinput data a data base librar data base librar o the place where and the way some results are presented Those key points are reviewed worksheet per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Worksheet in COALA o Input data Date 01 04 2015 Page 53 262 Item Language Date Project Title Temperature Pressure Maximum set index imax Reference Thickness Reference Incorporation of the series perforated protection 0 1 Thickness Reference Incorporation of the series cloths 0 1 Thickness Lw0 only known per 1 1 octave frequency band 0 1 LwO LwO Cell for input Foreseen action Comment for English input E for French input F
336. set to the loss factor of the base thin plate The lowest critical frequency fcx is derived as 0 5 E M J 2n D x The upper critical frequency fcz is derived as 2 M kz 2n al This steps aims at calculating the sound absorption coefficient at normal incidence of the acoustic structure assumed to be locally reacting 0 5 Step N o Bibliography references N1 N2 N3 o Comments The sound absorption coefficient at normal incidence derived by the means of the present step is referred to as a0 may be displayed alpha 0 o Remarks in relation with the displayed results In case of rigid impervious back at the room conditions of temperature and pressure the displayed results in terms of values per 1 3 octave frequency band computed from 1 21 octave frequency band values are comparable with the standardized measurement see standard ISO 10534 1 Acoustics Determination of sound absorption coefficient and impedance in impedance tubes Part 1 Method using standing wave ratio The values per 1 1 octave frequency band are obtained with SILDIS by averaging the results per 1 3 octave band Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page P
337. sidered 4 with a thickness 0 65 mm 5 with a diameter D 250mm 6 The length of the duct is 1 m 7 The flow rate is 1400 m3 h 8 The sound velocity in steel is accounted as 5100 m s Regarding models of computation the procedures basing the model referred to as 2081 are selected 9 except for the high frequency 10 Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA Item vel on Foreseen action Input See placemark input comment Temperature D6 Input a real number 17 1 Pressure D7 Inputa real positive 100000 2 number Select a reference Reference W31 material in the proposed STEEL 3 list Select 1 or 2 in the 8 x proposed list i Model of effective critical W37 Select a model in the NAT 4 frequency proposed list Thickness W38 Input a real positiy 0 00065 5 number Reference acoustic power D65 to boim E 73 6 61 6 49 5 44 0 11 spectrum K65 P 38 3 33 8 35 5 30 5 Worksheet in out COCID IN gt OUT Item Cell tor Foreseen action Input See placemark input Diameter D AH49 Input a positive real 0 25 6 Length L AHSI Input a positive real 1 7 Mass flow rate AHS3 Input a positive real 1400 360
338. sm 3 a parallel resistance losses due to mounting conditions Rp Nsm 3 R Zbase fig 1 9 Rp Lire Note the recourse to a complementary parallel reactance jM w and to a complementary parallel resistance losses due to mounting conditions Rp can be envisaged in order to try to improve all general models listed above Particular cases Special often in case of pure models of added length among cases those listed above R Nsm free input 0 Rp p cs free input oo M kg m2 free input simplified tunnel model is appropriate in case of thickness of the perforated sheet sufficiently low simplified tunnel model not based on the comprehensive calculation using cascade Simplified tunnel model is used in D3 D4 D5 D7 no influence of the speed of the airflow is taken into account for the computation except above Step E This step aims at predicting the surface impedance of a multilayered acoustic structure including porous media series cloths and series perforated protections with a back selected in a way appropriate for the considered simulation o Bibliography references E1 E2 E3 o Comments It has been taken into account that the most sophisticated lining of interest for the applications foreseen at ITS or elsewhere consists of a 4 layers filling see report PhRxx 006x 2 layers of porous media
339. sp oy1 being the flow resistivity of the porous medium of set 1 in the x resp y direction For the case ox1 cy1 1 and for the case ox1 6y1 variable a minimum flow resistance r gt rmini is required with r oy1 d1 Zo d1 being the thickness of the porous medium of set 1 Zo being the characteristic impedance of air Otherwise some important discontinuities may appear in the curves showing the propagation loss and some accuracy of some displayed results may be anticipated attention has to be paid that no such important discontinuity occurs this will be detailed in a future revision ofthe user s manual perhaps particular case for imax gt 1 i e more than one porous medium in the lining For the different mountings the determination of the propagation loss can be done for the following cases oxi resp oyi being the flow resistivity of the porous medium of set i in the x resp y direction ox1 cy1 oo absorber locally reacting and oxi 6yi for i gt 1 absorbers locally reacting depending on dlocal and hlocal resp alocal for mounting CO 6x1 6y1 1 absorber bulk reacting and porous media of sets with i gt 1 accounted as series porous media i e porous media acting as series impedances see remark and fig 1 9 below depending on dbulk and hbulk resp abulk for mounting CO oxl cyl variable inhomogeneous absorber in directions parallel to and perpendicular to its surface including the case of an absorber locally reacting and the
340. ss section Item un for Foreseen action Comment input diameter D m P47 Input a positive real o Main displays of the results Tables of results in case of rectangular inlet cross section amp rectangular outlet cross section insertion loss without self noise Di see lines 21 to 24 columns S to AD n self noise Lw see lines 26 to 30 columns S to AD sound power level downtream see lines 32 to 36 columns S to AD insertion loss with self noise Di see lines 38 to 41 columns S to AD Tables of results in case of circular cross section g insertion loss without self noise Di see lines 44 to 47 columns S to AD Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 233 262 self noise Lw see lines 49 to 53 columns S to AD sound power level downstream see lines 55 to 59 columns S to AD insertion loss with self noise Di see lines 61 to 64 columns S to AD 7 4 Examples of computation with SILDIS Example 7 4 1 circular mouth Envisaged application It is wished to compute the reflection loss of a circular mouth for room conditions temperature 14 1 C 1 pressure 1E5 Pa 2 with the methodology corresponding to the so called model 2081 3
341. st number of connections per m2 K92 Input a positive real m 2 vibration transmission factor not for general models K93 Input a positive real FAH DAV SHA1 SHA2 SHA3 compliance of connections for the general model DAV for the K94 Input a positive real compliance model BYO in mN 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 137 262 o Comments no comment o Main displays of the results Tables of results and graphs of a double leaf partition with connections between thin plates of sets 0 and 2 for imax 2 sound reduction index see lines 74 to 98 columns AA to AN 2 4 Examples of computation with SILDIS Example 2 4 0 porous medium with series cloth Envisaged application It is wished to compute the absorption coefficient of the lining considered in the corresponding in Section 1 with an impervious rigid back for a normal incidence Input data The input data required for the computation are listed hereafter in reference with the above data see placemarks The input cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Worksheet in COALA for example 2 4 0 on
342. st for the present version of the program angles from 0 to 89 375 with a step of 1 25 i e 73 angles OL is taken into account according various models as shown in the table below model 90 DAV MOI 04 O5 T source O4 O5 06 gL 90 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 122 262 Accordingly with respect to the orientation angle Y fora simulation between 2 limiting angles of incidence to choose the user will input by the means of the proposed lists a value for min and a value for pmax Y fora simulation of a diffuse incidence with respect to the orientation angle 9 the user will input by the means of the proposed lists 5 625 for min and 84 375 for pmax regarding the incidence angle 0 Y fora simulation between 2 limiting angles of incidence to choose without other consideration the user will input by the means of the proposed lists gt a value for Omin and a value for Omax gt the model for OL 90 Y fora simulation of a field diffuse incidence with respect to the incidence angle 0 usingthe classical approach consisting for a partition of undefined extent in using a unique
343. t 89 Steps A 1A to F 1A conditions of the applications amp propagation loss with flow of the silencer 89 Step G 1A by pass correction 90 Step H 1A reflection loss in the silencer eee 91 Step I 1A self noise of the silencer noise produced by the airfloW 91 Step J 1A insertion loss without taking into account the self noise 92 Step K 1A insertion loss of the silencer including the self noise 92 IA CHO VMAS caiieige iere eider deiere daiis tant ist ens sciatica 92 Steps of the computation eot meo ec ese quee Vosa uolo ne intel esnteie tenir den t t 92 14 3 How to use SILDIS ss 94 Operating conditions security level safety 94 M orksh ets eb Dip oir to PR D E Dd cd n io de net ere 94 Input data alerts and results the key points 94 Worksheet in COALA TA qu 95 Worksheet in COSIL 1A voce eter to rtr bre te tenes seas onassedevedeecadenseeeacaeiescadeeceeedcaedeeesdaacesvede 97 Worksheet in out CODIS 1A siens em me e heme hehehe he e s en se esse ee nnns 98 14 4 Examples of computation with SILDIS sss 99 Example 14 4 1 dissipative silencer with a rectangular cross section sssee 99 Envisased applicati n 11 erret opes cte eoe eo gr ete pompe reo abge da npe anea Sa TOSA ESATE E AESi 99 ludi RS 99 Screenshots o
344. t Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 73 262 Effects of the reflection loss illustration 1 5 5 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters having no transverse solid partitions being filled with a single porous medium homogeneous in directions parallel to and perpendicular to its surface having at room temperature a flow resistivity in the direction normal to the axis of the duct cy1 12000Nsm 4 a porosity 0 95 model M76 with a thickness d 0 1m and a length L 1m No series cloth is considered no series perforated protection is considered The insertion loss is considered with or without the reflection loss Illustration of one of the effects see below the prediction of the insertion loss depending on the existence or not of the reflexion loss see key in the graph insertion loss Di 35 without a with 30 ze on 25 L 2a e 20 a DT amp 15 5 enu 10 V m 2 5 5 ass v 0 T ags T T te 1 10 100 1000 10000 100000 f Hz ft 3oct Hz 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 63k 8k 10k 12 5k 16k 20k without 02 03 04 06 10 15 23 34 51 7 5 107 147 195 246 290 302 28 4 260 228 174 118 77 51 33 22 1
345. t Date Page PhR15 008A 01 04 2015 197 262 o Comments The sound power level downstream of the straight duct including self noise Lw1 in dB ref 1E 12W is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Lw1 10 log 10 0 1 Lw0 Di 10 0 1 Lw Lw being the self noise acoustic power of flow noise in dB ref 1E 12W The insertion loss taking into account the self noise Di in dB is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Di Lw0 Lw1 In case of rectangular ducts the obtained results are comparable with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss 2004 4 3 How to use SILDIS Operating conditions security level safety See corresponding in the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for which input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used Worksheet Cells in COALA E13 J37 W38 ua Meer Worksheets attention has to be paid to the fact that the considered sheet is not included
346. t per worksheet hereafter the cells will be referred to thanks to their EXCEL s coordinates column line in the following part of the present user s manual Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A Worksheet in out COSOD o Input data Date 01 04 2015 Page 258 262 Cell for Item input Language Date Project Title Temperature Length L m Width B m Height H m XS ys ZS hs 7 Room form variance y Objet fraction y Sound poser level reference spectrum dB ref 1 pW Sound attenuation in air coefficient Area of elementary surfaces Absorption coefficient Scattering coefficient Equivalent absorption area of objects associated with surfaces Equivalent absorption area of objects present in central area Consideration of model MOD for limitation to 100 of absorption coefficients Foreseen action Comment for English input E for French input F Modification of the displayed date Input a string Input a string Input a real number Input a real number Room dimension according x axis Input a real number
347. t user s manual Screenshots of the worksheets for the example of computation Worksheet in COALA Item cl Tor Foreseen action Input See placemark input comment Temperature D6 Input a real number 17 1 Pressure D7 Input a real positive 100000 2 number Reference acoustic power D65 to Tanut numbers 73 3 60 6 45 0 41 1 3 spectrum K65 P 37 0 34 7 37 4 32 5 Worksheet in out COBEND o Input data Item Cell for Foreseen action Input See placemark input comment mass flow rate Qm kg s T5 Input a real 1400 3600 110 4 model of cut off frequency N5 Select a model in the HAN 5 fco proposed list T Select a model in the T 6 model of 90 bend type S5 proposed list BE RA adimensional bend radius X5 Input a positive real 0 15 7 model of self noise AC5 ie model in the 2081 8 proposed list Only in case of circular cross section Item Cell for Foreseen action Input See placemark input comment diameter D m P47 Input a positive real 0 25 9 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 226 262 Screenshots of the worksheets for the examp
348. tact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 228 262 Appendix to Section 6 list of symbols General Cf corresponding in Section 1 2 3 4 5 Bend LwO0 sound power level without soundproofing equipment dB ref 1pW i e in the entrance plane of the bend Lwl sound power level with soundproofing equipment dB ref 1pW i e in the exit plane of the bend Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 229 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 230 262 Section 7 computation of nozzle reflection MODULE 7 of the software 7 1 Introduction Terms and definitions For the needs of the present user s manual the following terms and definition apply No particular term or definition Mountings and geometry The geometry used for the computation of bends is as follows rectangular or circular 7 2 Scientific and technical background The prediction
349. that may alone or coupled with others influence the acoustic performance of a partition what would be very difficult to do The goal is thanks to examples highlighting major key points considered separately of the design of partitions given some known laws of the physics some of the input data being chosen in order to be as demonstrative as possible given the plausible field of typical engineering applications All the numerical results below have been obtained using the software SILDIS with some post treatment for comparisons notably some of those results can not be obtained by the user in the presented form for a sake of simplicity of the software Effects of the properties of a porous medium in a non laminated lining illustration 2 5 1 Imput data a lining is considered at test room pressure and temperature with an impervious rigid back consisting of a single porous medium having at room temperature a flow resistivity in the direction normal to its surface oy1 variable from 8 to 72 kNsm 4 a porosity 0 95 model M76 with a thickness d 0 1m No series cloth is considered no series perforated protection is considered Illustration of one of the effects see below the prediction of the absorption coefficient at normal incidence depending on the flow resistivity of the porous medium see key in the graph absorption coefficient at normal incidence alphaO 1 20 1 00 16kNsm 4 0 80
350. thin plate 1 except for M 2 except for M 3 except for M 4 except for M comment computed from p as computed from p as computed from p as computed from p as entered for thin plate 1 and from d as entered entered for thin plate 2 and from d as entered entered for thin plate 3 and from d as entered entered for thin plate 4 and from d as entered Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 39 262 for cloth 1 for cloth 2 for cloth 3 for cloth 4 for general model PLATE 1 PLATE 2 PLATE 3 and PLATE 4 boundary conditions are taken into account using various models general model CE SSE comment Clamped Edges mon dges for general model FRO only using electro acoustic analogies complementary impedances can be accounted for some predictions to be done in relation with the COomputation of Acoustic LAyers with respect to the base impedance Zbase Rs with Rs superficial flow resistance see fig 1 7 a parallel reactance jM o Nsm 3 a parallel resistance losses due to mounting conditions Rp Nsm 3 RS Rp j Mo fig 1 7 Particular cases cloth fabri
351. those of the plate s of the set 1 or of the set 2 gos i id EN pa NN I T m TE 52 i I i s IL i i i I i tdg tdg tdg Ei i a 1 L I l i iod pi po zal i I Set4 Set3 Set2 Setl SetO I E i pe ju i l l D D in i i T l l l l l i wi AES tg tg gt n Wt uw Un trie RE a CE CRE acoustic structure acoustic structure Fig 0 5 4 The 4 poles representing the sets themselves can be represented as equivalent networks consisting of a combination of 4 poles elements such as porous media and of 2 poles elements series elements such as thin plates and by using an old school approach with other 2 poles elements series elements such as cloths and perforated protections see figures 0 6 and 0 7 below 1 1 i 1 1 1 i I 1 i 1 1 i w set 1 to 4 set 1 to 4 Fig 0 6 Mm 7 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 23 262 thin plate set 0 Fig 0 7 set 0 Mm 7 Mm ___ gt By using a new wave approach cloths perforated protections are 4 poles elements the quantities of corresponding series elements being set equal to 0 by
352. tic power for a plane wave with a statistic incidence i e all possible incidence with an equal probability between angular limits Sabine s factor asab ratio of the equivalent acoustic area of a sample to the area of the sample see NF EN ISO 354 Acoustics Measurement of sound absorption in a reverberation room 1993 Geometry The geometry used for the design of plane partitions with the program SILDIS is shown in figure 2 1 illustrating the case of a profiled cladding x in case of an orthotropic plate direction of highest bending stiffness xx axis about which an orthotropic plate is least stiff y direction of the thickness of the partition yy axis normal to the partition surface Z in case of an orthotropic plate direction of lowest bending stiffness zz axis about which an orthotropic plate is the stiffest Orientation useful in case of an orthotropic plate the angle may be displayed fi of the projection on the surface of the acoustic structure of the direction of propagation of the waves in the front atmosphere is considered with respect to the axis xx for example for a corrugated acoustic structure it is with respect to the axis parallel to the corrugations as shown on the figure Incidence the angle 0 may be displayed teta of the direction of propagation of the waves in the front atmosphere is considered with respect to the axis yy it Fig 2 1 Isolation Technologie Services SARL au capital de
353. timum required at the temperature of the application as far as acoustics is concerned can lead to a degradation of the performance for frequencies possibly within the range of interest This comment would also apply for the absorption coefficient for a statistic incidence See also the last paragraph of illustration 2 5 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 158 262 Effects of pressure illustration 2 5 4 Imput data a lining is considered at test room temperature and at a pressure from 100 to 400kPa with an impervious rigid back consisting of a single porous medium having at room temperature a flow resistivity in the direction normal to its surface oy1 48000 Nsm 4 a porosity 0 95 model M76 with a thickness d 0 1m No series cloth is considered no series perforated protection is considered Illustration of one of the effects see below the prediction of the absorption coefficient at normal incidence depending on the pressure see key in the graph absorption coefficient at normal incidence alpha0 1 20 100kPa 200kPa 400kPa 1 00 sean A AU A n a 6 0 80 a amp 0 60 ILS r1 act T ige 0 40 Go a 0 20
354. tion 610 mm 1220 mm 1830 mm circular duct ASH ASH ASH moral 2081 C ASHDSI80 1g9 lt p lt 380_ 380 lt D lt 760 760 lt D lt 1520 AER source AR3 AR5 AR5 AR5 AR5 thickness 1 mm for circular for circular for circular for circular he rectangular cross section cross section cross section cross section ZERo diameter diameter D lt 180mm lt D 380 mm lt D 760 mm lt D attenuation 0 10 m up to 180 mm lt 380 mm lt 760 mm lt 1520 mm 1 00 m Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 196 262 Step AS This step aims at calculating the insertion loss without self noise of duct straight runs o Bibliography references ASI o Comments the insertion loss without flow noise D i is computed according to various models as shown in the table below model 3733G 3733T COEDLA source AS1 AS1 step AR only for only for only for applications applications applications involving involving related toiit stacks made stacks made conditioning comment of thick duct of thick duct systems walls based walls based de of thin on graphic on table ins i i ali f displayed in displayed in pun AR d AS1 AS1
355. tion factors of the correlation between some calculations and on site observations For a rectangular silencer the obtained results are comparable with the standardized measurement with the plane wave excited alone as much as possible see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss 2004 1A 2 1 Thermodynamics and fluid dynamics e Steps of the computation Step a 1A All computations have been gathered in this single step for the sake of simplicity o Bibliography references al 1A a2 1A a3 1A a4 1A a5 1A o Comments in relation with partial derivatives Partial derivatives and related quantities which are usually employed to measure the equation of state of the fluid near the equilibrium state with various notations according bibliographic sources are written for the purpose of the present user s manual with the following notations n the isothermal compressibility of dry air is referred to as Cr Ge i ev i 8e V oP p oP T T the isothermal bulk modulus of dry air is referred to as Kr with Kr 1 Cr the adiabatic compressibility of dry air is referred to as Cs Li OV 1 op G V B is J because C Cr k T T the adiabatic bulk modulus of dry air is referred to as Ks with K 1 C Isolation Technologie Services SARL au capital de 7000 Euros
356. tions to be done in relation with the COmputation of Acoustic LAyers not only in the context of COmputation of Plane PArtitions Consequently see figure 2 4 below showing the most sophisticated acoustic structure available under the condition presently not fulfilled of complete implementation of the software a variable from 1 to 4 number of sets of elements is considered for the computation the sets being indexed from an impervious rigid back to the front airway side 1 to 4 a complementary set set 0 is used at the rear of set 1 consisting of up to 1 thin plate indeed 1 or several identical thin plates backed by atmosphere or 1 backed by an impervious rigid wall the selection being made by the user depending on the considered application for which the computation is performed Remark the set 0 has still not been 100 implemented in the considered revision of the software work on progress but considerable unsolved difficulties faced in relation with a computational overload For the total thickness of the acoustic structure d the following formula apply imax imax imax imax d di TP di D d ni di i 1 i 1 i 1 0 i di resp d i d and d thickness of the porous medium resp the series cloth the series perforated protection and the thin plate of set i I resp Id 0 or 1 depending on the incorporation or not of the considered element of set i in the acoustic structure
357. titions COPPAO with 0 thin plate in the acoustic structure COPPALI with 1 thin plate in the acoustic structure COPPA2 with 2 thin plates in the acoustic structure COSIL COmputation of SILencers CODIS COmputation of Dissipative Silencers CODIS1 attenuation accounted 1 time CODIS2 attenuation accounted 2 times CORESPT COmputation of REsonant Silencers with Pine Tree splitters CORESPTL COmputation of REsonant Silencers with Pine Tree splitters with a Lateral lining CORESPTR COmputation of REsonant Silencers with Pine Tree splitters with a Rear lining CODUW COmputation of DUct Walls COCID COmputation of Circular Duct walls CORED COmputation of REctangular Duct walls COEDLA COmputation of Empty Ducts Longitudinal Attenuation COSTDU COmputation of Straight DUcts COBON COmputation of Break Out Noise COBEND COmputation of BENDs COSOD COmputation of SOund Decay CONOZ COmputation of NOZzle reflection IDS computation of Sound Impact of Duct Systems Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 25 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0
358. ts acoustique fr Report Date Page PhR15 008A 01 04 2015 48 262 o Comments the self noise acoustic power of flow noise Lw in dB ref 1E 12W is basically computed at frequency steps of 1 1 octave for the mountings of the worksheet CODISI R R C1 C2 the determination of the self noise is done according various models as shown in the tables below model DNI DN2 NFI NF2 2081A source 11 I1 D e e model 2081B 2081R 2081C1 MUN VER 14 I5 I5 I8 19 source eem eem eem eem CEE B dB and 6 m are input data with an additional correction for temperature with an additional correction for pressure Note for the mounting C1 C2 the self noise is supposed to be equal to the self noise calculated for the mounting R R under the condition of an equal speed in the airways all things being also equal Furthermore a complementary model 2081C1 applies according I5 for the mounting Clonly not for other mountings indeed and with A Af Af see 1 1 and see comments above for the mountings of the worksheet CODIS2 Q CO the determination of the self noise is done according various models as shown in the tables below model 2081B 3733A1 3733A2 3733B ae 14 16 16 7 for the models 2081 and 3733 a spectral correction is used according various models as shown in the t
359. tters only Input a positive real For the COmputation of DIssipative Silencers with mountings Q CO only Select a model in the proposed list For the COmputation of Dissipative Silencers with mountings R R CO C1 C1 C2 C2 C3 C3 15 CR only Select a model in the proposed list For the COmputation of REsonant Silencers with Pine Tree splitters only Input a positive real Input a positive real For the COmputation of DIssipative Silencers with mountings R R CO C1 CI 72 C2 C2 C3 C3 Ya CR only Select a model in the proposed list Used for the interpolation of a ponderation curve generally of secondary importance Select a model in the proposed list For the COmputation of DIssipative Silencers only Item Cell Foreseen action Comment m In case of such an alert the input value for ilim has to STOP ilim gt imax D19 E19 uu be changed such as ilim lt imax aot apgilicabl G48 In case of such an alert the input value for the model of reflection loss has to be changed the use of results obtained with worksheets including at least 1 alert is highly discouraged Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR1
360. ue of AD mentioned in G1 is related to splitters filled with 1 porous medium with a flow resistivity ox1 oy1 from 9 to 15 kNsm no influence of the speed of the airflow seems to be taken into account for the computation no influence of a series cloth seems to be taken into account for the computation no influence of a series perforated protection seems to be taken into account for the computation Note 2 in G3 is mentioned for G2 basing G1 complementary information The data pool used for AD is related to splitters in 1 piece with a thickness 2d 0 1 or 2d 0 2 m with A d h 0 5 to 4 Model FRO ZER Bypass correction as above no limitation although at the time of the present user s manual the conditions of the measurement of the data pool G1 G2 are not known with accuracy one can consider that Dk Dk1 Dk2 the 2 terms being presently not known separately with Y DK1 to be accounted for the vibration transmission along the duct wall for the sound transmission over the duct wall for the vibration transmission along the splitter frame as described in G1 and for the imperfection of the interface between the lining and the duct Y DK2 to be accounted for the inhomogeneity of the used absorber in directions parallel to and perpendicular to its surface a unique model is used for taking into account the limitation of propagation whatever ox1 oy1 is may be that this correction should be used only in t
361. ue only if 1 in cell just above taken into account for the computation as a non zero value only if 1 in cell just above For NO input 0 for YES input 1 In case of input 0 the inj put data of the table below are not applicable the next table only must be filled Input a real positive number as requested for a 1 1 octave band sound power level Input a real positive number as requested for a 1 1 octave band sound power level In case of Lw0 only know band default values n per 1 1 octave frequency are foreseen such as LwO 1 3 oct LwO 1 1 oct 4 8 dB Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A o Comments Date 01 04 2015 Page 96 262 some data of the table above may not be modifiable by the user despite the displayed color of the cell data of the second table below are not taken into account for the design of dissipative silencers Item Cell for input Foreseen action Comment Rear atmosphere 0 1 For NO input 0 for YES input 1 not taken into account for CODIS Select a reference of element material in the Roe proposed list for each layer of interest Select a
362. uencies possibly within the range of interest This comment would also apply for the absorption coefficient for a statistic incidence For a given porous medium an increase of the density involves generally speaking an increase of the flow resistivity everything else supposed to be equal for example attention has to be paid to the consequences of the use in some locations of high density rock wools using bonded short fibers producing possibly linings with a high flow resistance in some cases especially when nothing is known regarding the properties of those materials in terms of flow resistivity porosity Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact g its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 156 262 Effects of the properties of porous media in a laminated lining illustration 2 5 2 Imput data a lining is considered at test room pressure and temperature with an impervious rigid back consisting of a surface layer being a porous medium having at room temperature a flow resistivity in the direction normal to its surface 6y1 72 kNsm 4 a porosity 0 95 model M76 with a thickness ds 0 02m No series cloth is considered no series perforated protection is considered a core layer being a porous medium having
363. urces will be specified on the occasion of a future revision of this user s manual 1 p a pne j p x yt 0 Where Co adiabatic velocity of sound ms p pressure Pa t time s 2 2 A pot 3 ox oy D Co ko M ae with Dt Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 44 262 ko wave number rad m M Mach number conditions of the propagation of sound inside the absorbing material for dissipative silencers a sound propagation exists in the lining of a dissipative silencer in a direction y taken into account in the software SILDIS depending on oy that is the flow resistance of the lining in the direction y the attenuation of a dissipative silencer is always depending on this phenomenon not only sometimes without transverse very thick metal sheets with a very short distance between them below 1 4 maybe 1 6 of the wavelength corresponding to the frequency of interest acting as partitions a sound propagation exists in the lining in a direction x depending on ox that is the flow resistance of the lining in the direction x Consequently the following cases are of interest 6x1 6y1 absorber locally reacting ox1 cy1 1 abs
364. used in the acoustic structure sssssessessesseetssseeerseetersretersereessereeseeee 110 Step E surface impedance of the multilayered acoustic structure with an appropriate back 110 Step M series thin plates in the acoustic structure 113 Step M series perforated thin plate 114 Step M series thin plates with an extensional damping in the acoustic structure 115 Step M series thin plates with a constrained damping in the acoustic structure 115 Step M series orthotropic plates in the acoustic structure 116 Step N absorption coefficient at normal incidence 118 Step O absorption coefficient for statistic incidence 119 Step O Sabine s factor iier tee ee HERE Rx E ERE NER R LEHRER RR LER REX EY ERR R EY EE RAN N ER EBENEN ERRARE Re a RE NEU IR 120 Step P sound reduction index for coupling 0 without sound leaks eese 121 Step P sound reduction index 1 leaf without sound leaks 122 Step Q sound reduction index for coupling 100 96 without sound leaks eese 126 Step R sound reduction index with connections without sound leaks cesses 126 Step S sound reduction index of sound leaks 127 Step S sound reduction index of sound leaks 1 leaf 128 Step T sound reduction index
365. ustique fr Report Date Page 01 04 2015 45 262 for the mounting CI resp C2 fco 0 586 co D 1 1 M resp fco 0 586 co D 2 1 M2 In case of an area of the duct above and below the silencer A equal to the area of the overall section of the silencer Af D 1 D1 else D 1 D1 2d resp D 2 D2 else D 2 D2 2d for the mountings Q fco 0 5 co Q 1 M In case of an area of the duct above and below the silencer A equal to the area of the overall section of the silencer Af Q Q else Q Q 2d for the mounting CO fco 0 586 co D 0 1 M In case of an area of the duct above and below the silencer A equal to the area of the overall section of the silencer Af D 0 D0 else D 0 D0 2d The determination of the propagation loss is done depending on the choice of the user for one among the following PhR15 008A Y v v cases ox1 cy1 oo absorber locally reacting depending on dlocal and hlocal resp alocal for mounting C0 ox1 cy1 1 absorber bulk reacting depending on dbulk and hbulk resp abulk for mounting CO oxl cyl variable for an inhomogeneous absorber in directions parallel to and perpendicular to its surface including the cases of an absorber locally reacting and the case of an absorber bulk reacting with appropriate values of ox1 cy1 depending on dbulk and hbulk resp abulk for mounting CO o particular case for imax 1 i e only one porous medium in the lining ox1 re
366. ut data required for the example of computation Worksheet in out COPPA1 for example 2 4 1b No input data required for the example of computation Item Simplified transmission factor for normal incidence 0 1 General model for R model of forced transmission model of resonant transmission model of transmission frequency range where f fc Cell for input See placemark Foreseen action Input comment For NO input 0 for YES 0 input 1 D Select a model in the proposed list MOI 30 Select a model in the proposed list A 30 Select a model in the proposed list ZER INI 30 Select a model in the proposed list NAT NAT 30 Select a number of 1 3 octave bands Worksheet in out COPPA2 for example 2 4 1b No input data required for the example of computation Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 145 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in COALA for example 2 4 1b only ww Laid ps r E pg pmi Lii M eque ep erat Dos o Me Sepe ei a int Move totem tee tug Spe eee OEE Rect carte he
367. utation Step BAC This step aims at calculating the sound pressure level at a specified distance of the duct system o Bibliography references BACI o Comments The sound pressure level downstream of the full duct system at a specified distance Lpoutcalc in dB ref 120uPa is basically computed at frequency steps of 1 1 octave as Lpoutcale Lwoutcale Lpoutcalc Lwoutcalc 8 3 How to use SILDIS Operating conditions security level safety See corresponding in the chapter General considerations For safety reasons some cells of the original file provided to the user as mentioned in the table below for which input data are foreseen to be entered by the user are pre filled with the value 1 0 among the yellow cells for which the color orange is used Worksheet Cells something like that in COALA E13 J37 W38 attention has to be paid to the fact that the considered sheet is not included in the worksheets listed below Worksheets regarding the longitudinal noise propagation i e for the computation of the sound power level downstream of the duct system Regarding the computation of the Impact of a Duct System the software SILDIS is configurated in order to allow the user to access to various worksheets being linked as shown in fig IDS 3 the overview of the worksheets being shown in table below
368. ve then calculated per 1 1 octave frequency band for a reference acoustic power spectrum Lw0 in dB ref 1E 12W Dif Da L Dk Dr Step K This step aims at calculating the insertion loss of the silencer including its self noise o Bibliography references K1 o Comments The sound power level with silencer including self noise Lw1 in dB ref 1E 12W is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Lw1 10 log 10 0 1 Lw0 Di 10 0 1 Lw Lw being the self noise acoustic power of flow noise in dB ref 1E 12W The insertion loss taking into account the self noise Di in dB is basically computed at frequency steps of 1 1 octave in reference to a reference acoustic power spectrum Lw0 ref 1E 12W Di Lw0 Lw1 In case of rectangular silencers the obtained results are comparable with the standardized measurement see NF EN ISO 7235 Acoustics Laboratory measurement procedures for ducted silencers and air terminal units Insertion loss flow noise and total pressure loss 2004 Step L For resonators with pine tree splitters only this step complementary to be added between step E and step F aims at the computation of the admittance in the plane of the outlet side of the neck of the chamber o Bibliography references L1 L2 o Comments The software allows th
369. w resistivity of the porous media influences sometimes considerably the acoustic performance of the silencer at least for some frequencies In particular the choice of a flow resistivity of the porous medium for the surface layer too big compared with the optimum required as far as acoustics is concerned can even with a thickness small compared to the total thickness of the lining lead to a degradation of the performance for frequencies possibly within the range of interest See also the last paragraph of illustration 1 5 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 71 262 Effects of the conditions of propagation of sound inside the lining illustration 1 5 3 Imput data a silencer is considered at test room pressure and temperature with an open area ratio of 50 the splitters being filled with a single porous medium having at room temperature a flow resistivity in the direction normal to the axis of the duct 6y1 22332Nsm 4 a porosity 0 95 model M76 with a thickness d 0 05m No series cloth is considered no series perforated protection is considered The longitudinal attenuation with a length L 1 5m is considered for the following cases 6x1 being the flow resistivity of the p
370. width of slit m Input a positive real Select a model in the model proposed list o Main displays of the results Tables of results lowest critical frequency of the thin plates see line 41 columns T to Y not displayed for the reference 3 PLY because depending on frequency highest critical frequency of the thin plates see line 42 columns T to Y not displayed for the reference 3 PLY because depending on frequency Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 135 262 Tables of results and graphs for the partition absorption coefficient for normal incidence see lines 73 to 91 columns A to L Tables of results and graphs for the partition with an integration within selected limits for orientation amp incidence absorption coefficient for a statistic incidence see lines 73to 94 columns M to Z Sabine s factor see lines 73 to 94 columns AA to AN Tables of results and graphs for the partition except for insertion loss see below with an integration within selected limits for orientation amp incidence with sound leaks sound reduction index coupling 0 see lines 99 to 121 columns A to L u insertion loss coupling 0
371. with soundproofing equipment downstream of the duct system dB ref 1pW i e in the exit plane of the duct system calculated with SILDIS Lwlref sound power level with soundproofing equipment downstream of the duct system dB ref 1pW i e in the exit plane of the duct system reference target imposed limit etc Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 249 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 250 262 page intentionally left blank Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 251 262 Section 9 computation of sound decay in enclosed spaces MODULE 9 of the software 9 1 Introduction Terms and definitions For the needs of the present user
372. xample 1 4 2b only Cell for Foreseen action see Item input 1 3 Input See placemark T Select a model in the Condition of propagation W182 proposed list oxl 6y1 1 8 Worksheet in out COPPA for example 1 4 2b See corresponding for example 1 4 1 Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 67 262 Screenshots of the worksheets for the example of computation Screenshot of worksheet in COALA See corresponding 8 for example 1 4 1 Dem Screenshot of worksheet in COSIL for example 1 4 2b I 0 _ em dae tee x nids de e mamis m n mne RAIL AN em APERTIUS neris H f H H r H LJ 1 es sue i ss 1 tt H amu emm ma i BI ee i i lepim m ope Orge Dag a 1l ae ea a ea i II lod VEE ETT STEEN IE ero j K 3 uter he gt O H i i LANI st me Ug ILE i A D FL bou om PE Ae re m ME Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 9
373. y references AMI AW AH 3 AH 4 Comments when used the cut off frequency for the first higher mode fco is computed depending on the speed of sound c the Mach number in the airways M and the geometry of the duct according to various models as shown in the table below model HAN MUN Source AH 1 AH2 when used the annular expansion frequency fRokt is selected as shown in the table below model NAT OCT Source AH 3 the annular expansion frequency is derived as for the general case i e not converted in 1 1 octave central frequency the model of HF High Frequency limitation is selected as shown in the table below model 2081 MOI source AH 3 Step AJ the HF limitation is derived as a corrected value This step aims at calculating the insertion loss of set 1 when compared to set 0 with atmosphere at the front and at the rear regardless of the selected input data o Bibliography references AJ Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report PhR15 008A o Comments Date 01 04 2015 the model of insertion loss is sele
374. y if 1 in cell just above For NO input 0 for YES input 1 In case of input 0 the input data of the table below are not applicable the next table only must be filled Input a real positive number as requested for a 1 1 octave band sound power level Input a real positive number as requested for a 1 1 octave band sound power level In case of LwO only known per 1 1 octave frequency band default values are foreseen such as LwO 1 3 oct LwO 1 1 oct 4 8 dB Isolation Technologie Services SARL au capital de 7000 Euros Si ge social 3 route du Mont Cindre F 69450 Saint Cyr au Mont d Or T l 33 0 952 36 35 31 Fax 33 0 478 83 35 31 E mail contact its acoustique fr Internet www its acoustique fr Report Date Page PhR15 008A 01 04 2015 54 262 o Comments data of the second table below are not taken into account for the design of dissipative silencers useful for other calculations in relation with the COmputation of Acoustic LAyers Item Cell for Foreseen action Comment input Rear atmosphere 0 1 For NO a tor YES not taken into account for CODIS Select a reference of element material in the Reference proposed list for each layer of interest Select a number in the select 1 resp 2 to get for set 0 the same plate as for set 1 2 proposed list 1 resp set 2 Model of losses Select a model in the proposed list Mod

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