Basic global prediction tool and user manual
Contents
1. TWINS 2 4 have been tested so far Sound powers will be detected inside the folder and loaded along with the Track Decay Rates Contact filter is always accounted adopting the train speed set in the Operating Conditions window while roughness can be set via the radio buttons unit 1 um roughness per each wavelength TSI the limit curve defined in TSI is adopted e Load one file the combined wheel and rail roughness is contained in one single file extension to See section 10 for format explanation e Load two files wheel roughness and rail roughness are loaded separately the software will add them up Same to format file is to be used Note that the sound power levels won t be uploaded until the Attach acoustic power button is pressed 5 TEST SITE DEFINITION r 2 TestSiteGeometry Ground geometry Ground modelling Select ground geometry Select ground model iv Delany Bazley mo y Ground position m Flow resistivity Pas m 2 0 5 3e 06 Figure 7 Test site geometry and ground impedance properties To define the test site the Test Site Definition item in the Create menu gives access to the GUI showed in Figure 7 The geometry can now be set only in terms of distance between the main reflecting ground and the top of the rail i e the vertical origin of the reference system The ground can furthermore be defined as rigid or reflecting Delany Bazley Miki2. Add standard bogies ________ Add single wheelset_ Add pantograph r Vehicle Position Wheelsets per vehicle SS EA pantograph s Add wheelset Remove last one Bogie centre distance m Bogie wheelbase m ok Add sources Save vehicle Cancel Ok Figure 3 Right click on the wheelset to edit its properties 2 1 ADD SOURCES The software allows now to add some general sources The add sources button opens the window shown in Figure 4 At first the frequency range has to be set all the files to be loaded within this window must match these range Different source types are available e Asa default setting a Point Source is proposed Sound power can be loaded from a file according to the format shown here by default a unit power spectrum is proposed ACT T4_2 D ISV 001 05 Page 7 of 14 12 03 2013 EC Contract No FP7 284877 2007 2013 adbbrRAIN e Alternatively the Area Source will distribute points on a given surface on the receiver side of the train For both these sources the aerodynamic source option can be chosen in this case a dependence of noise with speed has to be defined The source directivity is defined as a ratio between monopole and dipole behaviour Monopole to dipole ratio can be modified by the Reset all button in the Standard directivity panel otherwise a different ratio value can be set per each frequency by loading an appropriate to file click
3. Save vehicle Cancel Ok Figure 2 Describing new vehicle parameters Here it can be decided whether to create a new vehicle or load an existing In order to create a new one the main parameters has to be inserted in the Define vehicle geometry panel Once the parameters have been inserted press the ok button located inside this panel The axes on the right are then updated and other panels are activated Within ACOUTRAIN the wheelsets are characterized by their position on the vehicle x coordinates of the wheelset relative to the first end of the vehicle and by their type or the set they belong to Before adding a wheelset it s therefore necessary to create a wheelset type When starting a new model no types are available they can be created through the functionalities given in the wheelsets type panel The wheelset type contains the information about the wheel radius and about the results coming from TWINS calculation these will be loaded later on To create a new type enter the wheel radius associated and the name of the set then press the button Create new The list of available sets will be updated The existing sets can be then edited or deleted as required When at least one set exists the wheelsets can be added to the vehicle Two modes of adding wheelsets are available standard and one by one The first one allows one to enter the number of wheelsets existing on the vehicle and defining then the boogie
4. 32 bit runtime compiler launch the executable file to run the software 2 ADD A NEW VEHICLE When starting a new model the first vehicle has to be defined and added to the train From the menu bar press Create and then add Vehicle see Figure 1 the window shown in Figure 2 appears E AcouTRAIN E ms Le us File Create Calculations Edit ViewOptions Help x Add vehicle Add rolling noise Test site definition Define operating conditions Define receivers Figure 1 Add a new vehicle into the train ACT T4_2 D ISV 001 05 Page 5 of 14 12 03 2013 wcbirrain EC Contract No FP7 284877 M E a CreateWagon gt _ ee sca ana Actions fort Pan Zoom Rotate 30 X Z a Hide show Vehicle List sources Create new x Define vehicle geometry Length m 23 Roof height m 4 Floor height m 1 Width m 3 Vehicle name a A Ok Lor Wheelsets type Create new type Radius m Name Create new Available types Edit Vv Y Delete L J Add wheelsets Pantograph Vehicle Position 1 Add standard bogies Add single wheelset Add pantograph 0 WI i FT Sey pantograph s Wheelsets per vehicle 2 PE Ss Bogie centre distance m 18 Bogie wheelbase m ok Add sources
5. be moved By choosing the editing option the window used to create the vehicle is reopened and all the described functionalities are again available The List source will again display all the sources and wheelsets of the vehicle ACT T4_2 D ISV 001 05 Page 9 of 14 12 03 2013 wcbirrain EC Contract No FP7 284877 M 4 ADD ROLLING NOISE E A Sa 8 E loadRoliNoise a Select acoustic power files List of wheelset type A Text files Load text files TWINS folder ROUGHNESS Track Decay Rates Select Option Unit roughness 1e 6 m Load from file 9 Without Standard TSH jse TWINS computed Load one file roughness La e s Load two files roughness Remove aco power Plot aco power Attach acoustic power Figure 6 Defining a rolling noise input for a specific wheelset type The add rolling noise item in the create menu allows to attach to the existent wheelset types the rolling noise power components Figure 6 Within this GUI the sound power levels can be visualised in terms of acoustic power If necessary they can be removed from the model There are two different ways to load sound power into the software in both the cases the sound powers are meant to be calculated with a unit 1 m roughness input e Loading single files powers Wheel power rail power and sleeper pow
6. describe power due to rolling noise then the first column specifies the sound power speed dependence the first element should be the string speed then all the speeds values In the first row starting from the second element the third octave centre frequency value should be reported All the other rows describe the sound power levels in third octave band for each speed defined in the first column An example is available here When the file describes rolling noise sound power the speed dependence is not required any more In the first element of the first column the string wheel rail or sleep should appear then instead of the speed values a vector of zeros can be inserted The first row reports again the third octave centre frequency values below the sound power levels Axial power followed by radial for the wheel vertical power followed by lateral for the rail and total power for the sleeper e Wheel power example available here e Rail power example file available here e Sleeper power example file available here 10 2 ROUGHNESS After three headings lines three numbers define the wavelengths range The first number say x represents the longer wavelength the relationship between x and the longer wavelength 41 is 1 41 10 10 Similarly the second number defines the shortest wavelength available The last number defines the wavelength step and should be always set equal to 1 indicating thus that the wavelength correspond
7. ooocccccncccnononccaconononcnananancnononcnnnonnnnnnnn nono nn nn nnnnnanennno 5 Figure 2 Describing new vehicle paraMeters ooococcncccnononcccccncnononananancnnnnnonononnnnnnncnnnnnnnnnnnnnnnnnnno 6 Figure 3 Right click on the wheelset to edit its properties oooooonnniccnnccccnnncconnncnancncnonnnonannnana nono 7 Figure 4 Defining new source ParaMeterS cooooconccccconcccconononannncnnnncnnnnnnnnnnnccnnnnnnn anne nro nrrnnnncnnnnnnnnnnnr 8 Figure 5 Right click on the vehicle body to edit all vehicle properties including sources related to NT go A a Pg econ I ea Sees 9 Figure 6 Defining a rolling noise input for a specific wheelset type oooooooccccnncccccncccnoccccnoncnonannnns 10 Figure 7 Test site geometry and ground impedance properties cccceeeeeeeeeeeeeeeneeeeeeeeeeeeees 11 Figure 8 Receivers position assi 12 Figure 9 Results VIEW sacaran lada 13 ACT T4_2 D ISV 001 05 Page 4 of 14 12 03 2013 wcbirr ain EC Contract No FP7 284877 M 1 INTRODUCTION To run the code of this beta version of ACOUTRAIN a Matlab installation is required in your computer Matlab working directory has to be set as that where the files given with this document have been downloaded To launch the software type ACOUTRAIN on your Matlab command window or right click on the ACOUTRAIN m file in Matlab Current Folder window and then press run Alternatively a 32 bit compiled version is provided after installing the 8 0 Matlab
8. wheelbase and boogie centre distance In this mode only two or four wheelsets can be added Note that if two wheelsets are added the software will ignore the datum boogie wheelbase When pressing the button ok the software asks for entering the wheelset s type they belong to before updating the vehicle Both ACT T4_2 D ISV 001 05 Page 6 of 14 12 03 2013 wcbirr ain EC Contract No FP7 284877 M the wheelset position and type can be edited using the context menu available when right clicking on each wheelset in the axes see Figure 3 The second mode of adding wheelsets consists in adding them one by one using the button Add wheelset Pantographs can be added to the vehicle The pantograph to be added at this stage is not representative for its acoustic properties but its visualization on the vehicle image can help the sources positioning a gt CreateWagon ort Pan Zoom Rotate 3D lez so Hide Vehicle List sources Define vehicle geometry Length m 23 Roof height m 6 _ _ _ ______ _Q Floor height m 4 Width m 3 at 7 Vehicle name a T 2p 4 OF Ree 4 Wheelsets type Edit Position 3 y Create new type gt Edit type A A i Radius m D Delete 10 15 20 25 Set name Create new Available types i _ ear a Delete Add wheelsets Panto graph
9. AC TRAN EC Contract No FP7 284877 M Virtual certification of acoustic performance for freight and passenger trains D 4 2 Basic global prediction tool and user manual interim Due date of deliverable 30 09 2012 Actual submission date 12 03 2013 Leader of this Deliverable David Thompson ISVR Reviewed Y Document status Revision Date Description 1 26 02 2013 First issue failure to upload in the repository 2 26 02 2013 First issue failure to upload in the repository 3 26 02 2013 First issue 4 12 03 2013 Revision including comments from quality review 5 12 03 2013 Final version after TMT approval Project co funded by the European Commission within the Seven Framework Programme 2007 2013 Dissemination Level PU Public X PP Restricted to other programme participants including the Commission Services RE Restricted to a group specified by the consortium including the Commission Services co Confidential only for members of the consortium including the Commission Services Start date of project 01 10 2011 Duration 36 months Collaborative project AcibreAn EC Contract No FP7 284877 M EXECUTIVE SUMMARY The objective of this task is to implement a framework for a simple global simulation model based on the minimum requirements and input output data defined in Task 4 1 As input this global simulation tool takes data describing t
10. and Hamet Berangier models are implemented in the code Calculations without ground can also be performed ACT T4_2 D ISV 001 05 Page 11 of 14 12 03 2013 AC TRAIN EC Contract No FP7 284877 M 6 OPERATING CONDITIONS To define the operating conditions of the train the type of the test has to be defined Operating conditions in create menu Passby at constant speed or standstill mode are allowed When considering the passby mode the test duration can be here modified The test duration will also define the relative position between the train and the receivers x coordinate This latter is set to be in front of the middle of the train at half of the test duration time This parameter is somewhere displayed in the software windows but it cannot be modified 7 RECEIVERS fr 2 Receivers Microphone x position m 12 Figure 8 Receivers position Receivers can be added and edited through the Define receivers function Figure 8 inside the Create menu Default TSI positioning is available but further single receivers can be input Right click on the receivers shown in the figure for editing and deleting ACT T4_2 D ISV 001 05 Page 12 of 14 12 03 2013 AC TRAIN EC Contract No FP7 284877 M 8 CALCULATIONS Once all the previous parameters have been suitably set the software is ready to perform the calculations Go to Calculations gt Calculate to launch them Befo
11. ed with the Source list button top right The procedure of adding sources on a vehicle can be repeated as many times as it is necessary The vehicle can be saved as a Matlab file and loaded again for other models 12 03 2013 ACT T4_2 D ISV 001 05 Page 8 of 14 AcilreAn EC Contract No FP7 284877 M 3 MANAGE THE TRAIN When all the required wheelsets and sources have been added the vehicle is ready to be placed in the train After entering the vehicle position press the button ok right bottom the current window is closed and the main one restored with the new vehicle available By right clicking on this one several functionalities are displayed the vehicle can be copied edited moved or deleted Figure 5 r Sm gt lt lt S El acourran E EF o Lo emo File Create Calculations Edit ViewOptions Help a GA HD Edit Move Copy Delete List Sources BAD4 C MlocaNGSquicciarini_LocahKACOUTRAINW P4 Task4_2 ISVR GlobalT cofTrainitodels a mat TT TRAIN 2007 2013 f j SS Figure 5 Right click on the vehicle body to edit all vehicle properties including sources related to the vehicle The copy option will copy the vehicle and position it at the right of the existing one To move a vehicle from its position on a train to another one choose the move option from the menu and then left click on the gap between two other vehicles where the selected vehicle has to
12. er txt files can be selected after clicking the button load text files File format is similar to the point sources with the peculiarity that the first string in the file must be wheel rail or sleep according to the power component the file refers to It is not necessary to specify the correct speed since roughness and contact filter will be defined in the tool according to the speed specified in the window Operating conditions However in the position where the speed is normally defined inside the txt file a number is required but it won t be read by the tool Writing for example 0 is an allowed option See section 10 for further details In the wheel power file the first line after the frequency vector must be the contribution of the axial motion while the second line of radial An example is available herein the rail power file the vertical power component comes first one and the lateral afterwards note that if the rail power have been calculated per wave component then both the propagating and decaying waves should be accounted by adding them Example available here There must be only one power component in the sleeper power file Example available here e Selecting a TWINS folder If the outputs of the software TWINS are available then the Select TWINS dir button allows browsing to select a TWINS model folder outputs from ACT T4_2 D ISV 001 05 Page 10 of 14 12 03 2013 AcilreAn EC Contract No FP7 284877 M
13. he various sources on a train sound powers possibly directivities along with geometrical data about the sources the receiver and the ground properties From these input data predicts the evolution of the pass by sound level overall and in one third octave bands The development of this simulation tool is based on the required input output defined in task 4 1 The purpose of this simulation tool is to demonstrate the method of prediction required as part of the virtual certification process so that third parties can use it ACT T4_2 D ISV 001 05 Page 2 of 14 12 03 2013 AC TRAIN EC Contract No FP7 284877 M TABLE OF CONTENTS Exec tive SUMMA Vesna ra 2 a An PP cine aie ee eaereie erecta eeu 4 AAA PP o 5 y eee eer een ee eee 5 PP rrtt E EEEE ESO CEEE EEEEEEES aceeeeneatuanseeaceceeneans 5 dE oo fica 10 6 2 AA e eee ee ee ee eae eee ree eee ees 7 3 Manage the tala 9 4 Add rolling noise AR Pe 5 nenen 10 5 Testsite OSI seran ad 11 6 Operating conditions sacas 12 Ag Ru eee ee ee eee ee ones 12 AA e y A 13 A A eae ee ee ee ar 13 10 File tormat for upload lt siceiscsascctsceiueoeseasatoteretunesd exquse baie n E EEEE E TRER 14 10 1 Sound pOWETS ssocsturrarno eiii EaR Eaei ria E 14 10 2 ROUJNNES S caprina ii 14 10 3 Monopole to dipole ratio acaricio 14 ACT T4_2 D ISV 001 05 Page 3 of 14 12 03 2013 AcibreAn EC Contract No FP7 284877 M LIST OF FIGURES Figure 1 Add a new vehicle into the train
14. here to open an example and see section 10 Dipole axis can be modified by rotating it around the x axis and then around z axis from its original position parallel to z axis Directivity can also be described by the user in a text file in terms of noise levels at certain angles and radii in spherical coordinates system CE al ee Frequency range Directivity From 13 20Hz to 43 20kHz Use standard Load file Source type Standard directivity Source name noname Mon dip ratio _____ Monopole Dipole Load file 9 Point source FER Reset All E 7 Area source i Frequency H2 E 7 Aerodynamic source 25 Dipole axis 31 5 x rotation 270 40 on 50 z rotation 0 ok 63 80 100 125 E Sound power Unit Power y 121 19 bd age 120 wd 1 119 5 yi isl a t gt train 119 20 to 20k Hz T O Cancel Ok Figure 4 Defining new source parameters By pressing ok bottom right the current window is closed and the previous one is restored The created sources can be positioned on the vehicle by left clicking on the vehicle axes Once the sources have been positioned a context menu allows their position to be modified they can be switched off on deleted or edited as necessary To help the right clicking on the source the vehicle body can be temporarily made invisible All the sources and wheelset s type can be list
15. ing to a third octave frequency resolution are adopted Afterwards the roughness levels defined as in TSI should be reported Click here to open an example 10 3 MONOPOLE TO DIPOLE RATIO Again a to format file is adopted After three headings lines the frequency range is defined by means of three numbers The first one represents the starting third octave band frequency the second one the last frequency and the third one the frequency step set to 1 for third octave band The relationship between the first number x and the frequency is given by f1 10 Only the monopole percentage should be reported afterwards being the dipole one calculated consequently Example available here ACT T4_2 D ISV 001 05 Page 14 of 14 12 03 2013
16. re running the time increment can be here modified When the waiting figure disappears press exit button and then go to Calculations gt View Results to plot the sound pressure quantities Figure 9 fr 2 ViewRes E Receiver position do LpAFMax Receiver x y z 122 611 75 1 2 Sources 85 All y Global level Time _ _ _ _________ _ 80 Quantity Global value v 15 Select frequency band dBA 70 All v Update E Frequency 60 Quantity Lp x 55 Type time s _ Update Y A weigth Time s Export figure ext Figure 9 Results view 9 FILE MANAGEMENT When the software saves the model both the geometrical physical and numerical results are stored in the indicated folder When the model is loaded if valid results are found the user is asked to open the model in editing or non editing mode In non editing mode only few functionalities are available preventing thus undesirable modifications while anything can be done when edit mode is activated Note that the results will be modified only after the RUN button is pressed inside the calculate GUI ACT T4_2 D ISV 001 05 Page 13 of 14 12 03 2013 wcbirr ain EC Contract No FP7 284877 M 10 FILE FORMAT FOR UPLOADING 10 1 SOUND POWERS It s a txt containing a matrix of strings and numbers The elements of the matrix should be separated by the character Tab When the power file does not
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