GATB Tutorial
Contents
1. Figure 5 25 Results Output Report in the Playback Editor Notice the small differences between the two results windows Figures 5 25 and 5 26 The linear acceleration for the pelvis in the Z direction has lowered However in examining the linear acceleration in the X direction for the pelvis the value has increased from 0 145181 g s to 0 160636 g s There are other small changes with all of the mass segments but you can see the effect that moving the pelvis downward slightly affects not only the linear acceleration of the pelvis in the Z direction but affects the other mass segments in other directions as well To further confirm this click on the T button on the toolbar to return to the Event Editor Select the pelvis with the pointer mouse icon Change the position of the pelvis to z 4 0 Y Voy Clear the event data by clicking the L button on the tool bar gt Execute the event for one or two timesteps Return to the Playback Editor and view the Output Results window It should look like Figure 5 26 5 30 Manual printed October 30 2003 Tutorial Baal a LA PIL RF Fosse poe There watt no indivicuni tabular time blatory Biles fer this pen aj a Mio FRE Tin Fon Tint 6 66 marc IMERTIAL LOCAL A ANGULAR ROTATION DEG ANGULAR VELOCITY CRABS SEC ANGULAR ACCELFEFATIOM PAD SZEC 2 3EGHENT TAW FITCH FULE T I 1 Fely Dor 25 0004 p B000 0 00000 o 80000 0 60000 6 000000 zi as Goditi Bed2. cS NOTE HVE will append the name of the calculation method to the event name thus the complete event name will become EDSMAC4 Frontal Impact gt Press OK to display the Event Editor vent information et Evert Mame Frontal Impact Humans Litt Hae Ado WES GO HHImE 5 Earl Kumare andi Voies Buck Skylar 4 01 Chroit Liane 40 Cadion Method CF ca C gelatin Heated EDEMALA Selected Figure 5 19 Setting up EDSMACA event Manual printed October 30 2003 5 19 Tutorial Now we re ready to set up the event gt Y 5 20 Using the Event Editor dialog select Buick Skylark 4 Dr from the Event Humans amp Vehicles list Choose Set up from the menu bar select Position Velocity and click Initial The Buick is displayed at the earth fixed origin In the Set Initial Position Velocity dialog for the Buick Skylark enter the following data in the appropriate fields x ft 30 y ft 6 yaw deg 180 Click the Velocity is Assigned box in the Set Initial Position Velocity dialog and enter Total mph 25 Select Chevrolet Caprice 4 Dr from the Event Humans amp Vehicles list Choose Set up from the menu bar Select Position Velocity and click Initial The Chevrolet is displayed at the earth fixed origin In the Set Initial Position Velocity dialog for the Chevrolet Caprice enter the following data in the appropriate fields x ft 15 y ft 6 yaw deg 0 Click the Velocit
3. RF Pons pra There were no individual tabalar rime biatorw Piles fer Chia pon a AI TAS FCD TIRE 5 55 EEC INERTIAL LOCAL DHAL ANGULAR ROTATION DEG ANGULAR VELOCITY PAS FIC ANGULAR WOCELERATION RAR BECP Rh SEGRENT TAW FITCH ROLE i T I x T E i Fels 0 0000 25 0000 6 0000 0 00000 0 00000 0 60000 o 000000 f 117709 0 000000 2 Aila gU DICO 20 00 0 0000 a 20005 T HEOO D CHE D D0UDCGU 110 972420 O 00000 3 Choa 000 15 0008 5 000 in oonna 6 00000 Bi 50068 i 006000 gt CG D 000650 4 Back 0 Ole 5 0000 0 0000 n ROL 0 500500 0 00000 5 00000 5 005531 0 000000 E Head Qa DEA Da D Dr DTD Ta TTT ga Ce DPI Ln OTTO PET UE Du A 5 FOL 0 0000 L00 0000 0000 0 BAD Qu 00000 00000 o 573013 E 855 T5 T SOTAL 7 ELL 5 PAIT 50 5845 1 3767 D 00000 0 00000 O 00000 5 312295 ot 094538 5 043 a RF ADA 235 440 1 2007 0 00000 a 00000 0 00000 ot PPO LIN iar zl160 182243 LOL 0000 i00 000 1 0000 0 60000 0 00500 0 60000 2 073413 EM CL 27 307521 in ELE da 9539 36 9345 LOT B 60065 6 06500 do e 3 T1EEB3 3 58954224 bi d i am oh bf CAQUEMM DISPERA dre M UU Un UNUM M PUR 3 4 7 lil Ted EL EU Ed Az FUA 0 0000 915 0000 p 0000 in 00000 T 00000 0 00000 LORI Di ITAL 3 540518 i ELE B YI 724 2372 JF AA ii A ET ES fi cain i ALTI mill KALAT Pt eh 14 LEA 0 te 35 0000 5 0000 0 0D a 00000 0 ono f 1035063 Gt BG AA EM Sie 15 LIA La BET Va DITE EE 001 a E du 00300 DNI bu HE 4 69120 J FAE
4. 5000 Focal Length 50 mm Another view that is helpful to demonstrate the side motion which occurs 1s positioned with the camera attached to the Chevrolet Caprice as follows Camera Coordinates x 5 ae z 10 Picture Center x 0 y 2 g4 Depth of Field near 2 0 far 5000 Focal Length 50 mm 5 34 Manual printed October 30 2003 Tutorial To explain how the principal direction of force affects occupant motion return to the EDSMAC4 event in the Event Editor Select the Buick Skylark 4 Dr from the Event Humans amp Vehicles list Choose Edit form the menu bar Select Position Velocity and select Initial VY vv V Change the following values X ft 23 y ft 3 5 yaw deg 270 Clear the calculation by pressing the L button on the tool bar Execute the EDSMACA event Return to the GATB event Select the Chevrolet Caprice 4 Dr vehicle Y vvv Y Choose Set up from the menu bar and select Collision Pulse from the drop down menu gt Select the new collision pulse EDSMAC4 Frontal Impact cS If you do not have EDSMACA or were not able to execute the EDSMAC event open the filename GATBTutorialPulse2 gt Press OK to select the GATBTutorialPulse2 collision pulse cS If you are having difficulty in completing this portion of the tutorial the file GATBcreateGATBpassenger in the HVE supportFiles case directory contains all necessary information up to this point This completes the examples o
5. O 103641 2 Chua 13 9 14 500 13 31 5 000508 s5500 25065 Bi eh 4 000050 0 805 4 Deck kl tele 16 0000 21 0992 0 00000 e 10000 0 09000 6 370231 0 000000 0 156245 5 Head 19 117 GD 27 2265 O 20000 DM 100500 0 00000 D 440130 0 000000 D 18167l A BEL AMA Si Fri sr NG 113 Fi conii A HiHi Ti cann 1 BA 00 Gi i AO 7 ELL dii Mt 22 5759 aif 7285 O Soe i tie i1 O eon Db 216772 0 003 1 171 754 a RF dai CA 23 348450 Fi TT i ODD du neu a DAANG Ko AA aa hE Te 1 035824 9 LOL 9 1185 11 230 74 0111 0 50000 6 H000 D So O 201204 0 00 0 194692 40 LLL 4 401 9 6741 5 7285 0 600008 6 10000 0 830000 5 216392 D 033 44 1 171754 li Ew PLN DB tiii 5 5420 d cut dh ditta Hi aru 6 dani HOA Lama l2 PA IA 23 0847 Hang 0 00008 g soon OO 0 170577 fl DH 0 250188 13 ELA 10 BEI Baila I a ii Da BOI Ci 00000 D DATO D IIS i ELI A4 LU 19 731 B 9L13 14 7244 0 00000 Gu MORI n 200000 D IT7DETT sere O 501 03 15 ELA 210 2 B885 wh 5340 O 00000 DM 4000 0 00000 5h 250420 D 021241 O Ez91I5 LA TPU n nee Ex Nan O Mm sfera fi Ps A riti A nans h n a Figure 5 26 Results report after changes to Human Position By reviewing this figure compared to the previous two figures you can see the angular accelerations for the legs and feet have become quite large and the linear accelerations particularly for the feet have become very large Effectively what we have done by moving the pelvis downward is position the feet int
6. earth fixed origin Now let s set up and execute the pedestrian simulation event using GATB gt Enter the following values in the appropriate boxes of the Position Velocity Initial dialog See Figure 5 33 x ft 2 15 0 y ft 2 5 0 z ft 2 094 Roll deg 0 0 Pitch deg 0 0 Yaw deg 0 0 Assigned Velocity mph 15 0 5 40 Manual printed October 30 2003 Tutorial O 212 Evert Marte Pickup Pedestian impari Evert Horae andi Vekaclet Dodge Dik ct Flea d Hale Ada wt SO pr 50 Path Location Position X mp 15 00 Roll degj 0 00 vu 500 Pitch deg o0 z 203 Yaw ideg 000 M Velocity is Assigned Velocity Total mph 15 00 Sideslip deg 0 00 u mph 15 00 Roll deg sec 0 00 v mph O00 Pitch dea sec 0 00 w mph 000 Yaw deg sec 000 Figure 5 33 Setting Initial Position Velocity of Dodge Pickup Manual printed October 30 2003 5 41 Tutorial gt Using the Event Editor dialog select the Human from the Event Humans amp Vehicles list then select Set up from the menu bar choose Position Velocity and click Initial The human is displayed at the vehicle s origin notice the human is half buried in the vehicle geometry this occurs because AutoPosition does not apply to humans See Figure 5 34 gt Enter the following data in the appropriate fields
7. event will be highlighted This is shown in Figure 5 24 5 28 Manual printed October 30 2003 Tutorial Active Events IEDSMALA Frontal Impa iGATE AF Pasengel Window Mame GATB AF Passenges Select Output Accident Histon DE Cancel Figure 5 24 Setting up a Report Window Once the GATB event is highlighted the available output reports are listed by clicking on the button next to the selected output For this tutorial we want to generate a Results Output Report gt gt Click on the list of possible output reports and select Results Click OK The Results Output Window is displayed in Figure 5 25 In this example our initial human position has the pelvis accelerating downward in the positive Z direction at approximately 0 62 g s In order to position the occupant where this downward acceleration is smaller we want to move the pelvis downward a small amount gt Return to the Event Editor by clicking the Event Editor button on the tool bar Ee Click on the pelvis and change the Z position from z 4 6 to z 4 5 Click the Reset button LJ on the tool bar to clear the event data Click the Execute button 7 on the tool bar to execute the event for one or two timesteps Return to the Playback Editor by clicking on the Playback Editor button df on the tool bar and view the Results window again See Figure 5 20 Manual printed October 30 2003 5 29 Tutorial Baal s LAL
8. in the Position Velocity Initial dialog See Figure 5 35 x ft 7 15 y ft 1 5 z ft 1 0 Roll deg 0 0 Pitch deg 0 0 Yaw deg 120 0 Assigned Velocity mph 1 0 gt Execute timestep rewind to time 0 0 sec and examine the foot ground interaction cS NOTE Total weight of the pedestrian 173 5 Ibs in this example should be approximately equal to total force of both feet interacting with the ground Hebe Baty cmm Tem 78 LT NG ridi A A Figure 5 34 Setting up pedestrian position 5 42 Manual printed October 30 2003 Tutorial Figure5 36 shows total force from feet ground contacts to be approximately 810 Ibs We must move the pedestrian up slightly gt Change the Z position of the pedestrian to 1 056 feet Results of this change is shown in Figure 5 37 cS NOTE You may find it helpful to edit the language rsc in the HVE supportFiles sys directory in order to show 3 decimal digits We will use the collision pulse to approximate the vehicle braking gt Enter the following collision pulse for the Dodge Dakota 4x4 See Table 5 3 cS NOTE This crash pulse is available in the file GATBTutorialPulse3 Execute the run to analyze pedestrian behavior in this type of crash The speeds of the vehicle and pedestrian can be modified as well as braking effort on the pickup Results of this run are shown in the following figures cS If you are having difficu
9. 003 Tutorial Lar Bin DH ee ee Do m Em e ir Chorale Caprice 4 n 0 mn nom O fa E A soa T gt ae hie Figure 5 11 RF Seat Cushion contact surface It is obvious that this first attempt at making the Right Front Seat Cushion contact panel creates a surface that is too narrow and does not extend rearward enough This panel is also slightly above the seat cushion By modifying one of the corner positions at a time the correct seat panel can be determined visually gt Adjust the following corner coordinates to make the panel appear similar to Figure 5 13 and 5 14 Left front corner x 3 y 2 z 1 Left rear corner x 20 yes z2135 Right rear corner x 20 y 26 z 1 5 Manual printed October 30 2003 5 13 Tutorial Co gt i E eres ER I AE AO T FT ky pon Reed FILI Dao KEN E aaa Lite U Fam 5 Lea r Leur a darmi Lam bees eee Che Pma soo Tima eM RII I2 CR E rh gt de sepes ma a UI sada ir mm A E amag Cora Tuan i alfa Dey HE Figure 5 13 Editing RF Seat Cushion contact surface SECOND H UU a a a Figure 5 14 Corner points of RF Seat Cushion 5 14 Manual printed October 30 2003 Tutorial The visualization of the contact panel is shown in Figure 5 15 You can see that the flat contact panel does an adequate job of approximating the complex surface geometry of the seat cushion Create the remaining contact panels in the
10. 14 VEE 0 0000 6 0000 6 0000 0 00000 6 00500 b 06000 6 000500 5 000000 OB 60000 JENEFTIAD 1EXPTIAL Lb LINEAR POJITEION ICH BICAN TELOCITT INCE SEC BIBE ACCELERATIONS NG Dj SEGMENT x T Zz x Y E K T i batu A ere LE nihi all mum fi eir n reri n erben iA banal it NA i acs Dd 2 Beda Ig 5089 16 6000 5 0264 0 00008 e 00000 5 60000 1 066881 0 000500 D 336515 2 Ema 17 p9 6 2300 ii lit iii n posso i cane p TZ TETU bado PE ESE 4 Beck 21 2212 16 0000 23 1991 6 00000 0 00000 0 80000 6 330536 0 000000 6 518567 5 Head 19 23137 16 0000 27 J321 0 20000 O DC 0 00000 Oa POI Ge D ALI K BEL IR 2n Tr mill 1111 Fi conii fb DT Ci nerui i e ETA n mLER4gT 7 RLL di d 22 9759 n S285 O 00000 ih Goleta 0 00000 O 111504 ee 1 074330 a BF dali E 25 8550 3 0047 i HAD da 00000 0 00000 DONT ni CL al Sol Lu ae 9 LOL 1155 11 2230 ed 1111 0 00000 0 00000 0 00000 0 121292 0 046979 0 416647 iB LLL 4 4023 5 0241 5 8285 0 60000 6 00500 6 60000 6 111904 5 022523 1 024330 ii Ew ld thra a tren E in ftt amp nal D cun in os Toe 5 LE i dui 12 PAA 19 7135 43 0887 14 8245 0 00000 0 00000 6 20000 8 191747 0 022067 0 713390 13 ELA 10 BEI EJ LEWI BIO D Ba OO O cona DOLE Di 000 D SHAB X A4 DEA 19 7315 B L13 14 8240 0 00000 B ODDO 0 09005 191747 DT O TAO 15 ELA i 5594 A bass 25 5340 O 00 d DH B BOO iii 120217 5 0051 O FAA ba NTO ita n au A er fi Pau UNES di Cau P nai A nana LE I EP a Bl
11. NAG E x Er E 2 woe i z E A E iz la 2 Nu E Pn n Le 4 med AGA Hig Conte 7 DOT da SU r TG EO e zu S ET E cp TG Ka Di etc E CIE tole NG s Pa KG ry i ne PP Pre e ni z r 3 e n a E APREA 2 4 2 ota T gt ni T a bei OEC syn So r ni E a e OP OF PL ona i 7 i gt zr 07 7 zs apu ine 4 E n VS a ERNE EEA NA a Lal Ta ie e N ES Do Eg D D LT D D E D D D r DN ara ab E NT Pu y D D D AS rare E f A arms ih rc on i PAANAN ee ea DE E oe 3 r E A Pa Ping ub see e A aet am TS No Set m e RA er ur E E z F z 3 UA R i A E wan ang 7 e di 8 LI CONTACT D p E ci Pair E x Se ie sages er ars EO a a MER Cad rote pn aang tnk OE d kang ni E ng oe E OA ni T os ni ausi Ree a eae a eee i NAN US Pape An Aia m E y Putin C PASOS LR RET M A We P DE UE ni D T 24 dada r Tota 3 Par 3 E ir I dre a pt ital zd chr En Ap NAA S ear Ba Na en ae Pang nag Baa MIU BAGA Anes NG Kapa a glee A nek pecs Figure 5 16 Parallelogram contact surface For purposes of illustrating the contact panels we have set the vehicle geometry to NoBody h3d Two different views of these completed contact panels are shown in Figures 5 17 and 5 18 cS NOTE If you are having difficulty in completing this portion of the tutorial the file GATBcreateContactPanels file in your HVE supportFiles case directory contains all necessary
12. Tutorial GATB Tutorial Chapter This tutorial provides examples illustrating two common applications of GATB occupant modeling and pedestrian modeling Creating GATB events involves the following basic steps Create the humans Create the vehicles Create the environment Create and execute the GATB event Once the event has been executed output reports can be viewed in the Playback Editor These reports were discussed in Chapter 3 of this manual The basic procedure for creating GATB events is described in detail in this tutorial cS NOTE It is assumed that HVE is up and running and that the user is familiar with HVE s basic features The purpose of this tutorial is to illustrate these features while setting up and executing a GATB event cS NOTE Environments are not required in the creation of a GATB event and will not be discussed in this manual Review the HVE User s Manual if you have questions regarding the creation of enviroments Manual printed October 30 2003 5 1 Tutorial Getting Started The first step is to set the user parameters cs NOTE Most options simply affect the appearance in a viewing window during Event or Playback mode However some options affect the data used in the analysis For example if AutoPosition is On the vehicle position conforms to the local surface otherwise the position is set by the Position Velocity dialog IS NOTE Some of the following option
13. ae Figure 5 22 Initial Position of RF Occupant Notice that the pelvis is embedded in the seat cushion and that it needs to be moved upward To correct this problem do the following gt Select the pelvis ellipsoid and change the vertical position to z 4 6 in Notice the pelvis and chest are also forward or in front of the seat back gt Select the pelvis ellipsoid and change its position to x 16in gt Select the Velocity Is Assigned checkbox in the Position Velocity dialog and enter a forward velocity of 0 0 in sec cS NOTE Because the human is defined as an occupant as opposed to a pedestrian the initial velocity is defined relative to the vehicle gt Adjust the pitch angle of the Right and Left Upper Legs to 75 degrees 5 25 Manual printed October 30 2003 Tutorial Let s attach a camera to the vehicle to better see the human IS NOTE This tip really helps while positioning occupants because it allows you to move the camera relative to the vehicle thus you can quickly focus on the interaction between the human and the seat cushion an important part of placing the human in an equilibrium position Choose Set Camera from the View menu The Set Camera dialog is displayed Click the View From option list and choose Chevrolet Caprice 4 Dr Enter the following coordinates in the available fields Camera Coordinates x 1 0 y 10 0 z 1 0 Picture Center x 0 0 y 0 0 z 1 0 Dep
14. cal matter the user will never be able to produce exact equilibrium i e All linear and angular accelerations are equal to zero Every analysis is different and there are no strict guidelines that define when the human position is close enough to equilibrium In general compare the linear acceleration for all the human segments to the linear acceleration of the crash pulse and ensure the human accelerations are much smaller In addition the linear acceleration of all segments should be at least under 0 5 g s with the possible exception of the feet which should be at least under 1 0 g s cS NOTE On humans with small abdomens it may not be possible to achieve 0 5 g s In this case make it as low as possible but certainly under 1 0 g s The basic procedure for establishing equilibrium are as follows gt Position the vehicle so that the roll pitch yaw and acceleration pulses are all zero gt Set the initial velocity of the vehicle to zero gt Clickthe 7 button on the tool bar to execute the program for one or two time steps cS NOTE The exact termination time is not critical gt Goto the Playback Editor by clicking the 4 button on the tool bar gt Click on the sign on the tool bar to add a preview window The Report Window dialog will then appear with the active events shown cS NOTE If you have not run the EDSMAC4 simulation the active events list will not include EDSMAC4 The GATB RF Passenger
15. f the occupant simulation You may wish to modify the crash pulse by rerunning the EDSMAC4 event and changing the direction of the crash pulse and then importing it as previously described You can also change the camera positions and explore other aspects of the occupant motion Manual printed October 30 2003 5 35 Tutorial Pedestrian Simulation Using GATB to simulate a pedestrian impact is very similar to the previous occupant simulation gt Select File from the menu bar and save any previous work you would like to keep To create the human pedestrian in this example perform the following steps gt If the HVE Human Editor is not the current editor choose Human Mode by clicking the A button on the tool bar gt Click the sign on the tool bar to add a human The Human Information dialog is displayed The Human Information dialog includes option buttons allowing the user to select a seat position within the vehicle alternatively Pedestrian could be selected and assign the human s attributes according to Sex Age Weight Percentile and Height Percentile Figure 5 29 Pedestrian Human in the Human Editor 5 36 Manual printed October 30 2003 Tutorial Using these option buttons click each one to choose the following human attributes Location Pedestrian Sex Male Age Adult Weight Percentile 50 Height Percentile 50 cS NOTE Make sure the moment of inertia data for the right and left u
16. information up to this point Manual printed October 30 2003 5 17 Tutorial LR nd Ps TB ee oh Fl ITE Fis du fee o imeem Aa d DE mr pide baa Pi IB 4e lr okey set air dl Mia NW gab bk ie IDO A uo kit EXA Hebe Beatty ENT 3 Fon 1 off 458 Doy Figure 5 17 Oblique view of contact surfaces CETO D pa Ho ii sam Tha i NAG ik M ih B CT F F a die ME Kaka AF nsir mey NETT i DN Zen Figure 5 18 Side view of contact surfaces 5 18 Manual printed October 30 2003 Tutorial Creating and executing the Events We will now create the simulations necessary for a head on collision The collision pulse needed can be directly obtained by using the EDSMAC4 collision simulator cS NOTE If you don t have EDSMAC4 on your HVE system you may skip the EDSMAC4 event The collision pulse for this event is shipped with GATB and may be loaded by selecting GATBTutorialPulse 1 from the Collision Pulse File Selection dialog gt Choose Event Editor by clicking on the 3 button on the tool bar gt Click on the sign on the tool bar to add an event The Event Information dialog is displayed See Figure 5 19 gt Select Buick Skylark 4 Dr and the Chevrolet Caprice 4 Dr from the Active Vehicles list gt Select EDSMAC4 from the Calculation Method options list gt Enter a name for the event Frontal Impact The Event Information dialog should look similar to Figure 5 19
17. lty in completing this portion of the tutorial the file GATBcreatePedestrianlmpact in your HVE supportFiles case directory contains all necessary information up to this point T Teen i oj LI I Mei Figure 5 35 Positioning the human in front of pickup Manual printed October 30 2003 5 43 Tutorial Table 5 3 Collision pulse to approximate hard braking by pickup Examine Figures 5 38 through 5 41 for views of the pedestrian interaction with the pickup truck Try several different scenarios increasing and decreasing the speed of the pickup Also try changing the initial velocity of the pedestrian to study how the motion across the vehicle changes 5 44 Manual printed October 30 2003 Tutorial Rim LH am ie biam hha Cenin biip Doo E Rok Re ieee iriga pa BCE alti nd DEE fp Am oe neg to 4 Dm Tp T Ib fm Ue Lee 3 3 Ba kaan tai ra 4 dl tri 95 i Hir Bai RENTO Tw s oll ara tem MEI Figure 5 38 Time 0 05 sec TY PIL EF CERTE ee PDDE a ihi Des Ed A Car horde iria mp J MA di TT Like A k ex 1 E Fi sl EET Fe 374 Gay NG ridge maa Hi fase Figure 5 39 Time 0 10 sec Manual printed October 30 2003 5 45 Tutorial ba san Kir Rod am Theo afp PIL Geinin dee Dol e PA UU CL Me u BT FS T tia hbd Na eens aj 274 Demy Na Piet maa 11 ae LT ma
18. ma IEA PTT Ebo Rud Pam Tiir orto eh a ibp Dis il 5 mos E p AT Triade ipa pa I Ka ELL AT FS T i li tes MT gu na Mn a z ii Teen L rj Fa Duy NG rige gn HI HE Figure 5 41 Time 1 00 sec Contact Panels not shown This completes the examples of the pedestrian simulation 5 46 Manual printed October 30 2003
19. man will be placed in the environment relative to the vehicle and will have an initial position of x Z0 y 20 z 0 This is the position of the human pelvis center of mass with respect to the vehicle center of mass IS NOTE The Position Velocity dialog displays the current position and orientation of the human relative to the vehicle fixed coordinate system gt Initially position the human by moving the pelvis to the following location x in 14 0 y in 16 0 This positions the human as shown in Figure 5 21 Manual printed October 30 2003 9429 Tutorial OM LES a ET a LLL cmm dem cf j 2 8 Dee oc risit gno Fi o KR Figure 5 21 Setting up Initial Human Position LS NOTE The legs are embedded in the floor and the human is not in a normal seated position where the torso is in an approximately parallel position with the seat back gt Change the pitch angle of the pelvis to 25 degrees gt Select the Left Upper Leg of the human by using the mouse pointer icon to click on the ellipsoid gt Enter a pitch angle of 80 degrees in the dialog box gt Select the Left Lower Leg of the human and change its pitch angle to 50 degrees gt Make the same changes to the Right Upper Leg 80 degrees and Right Lower Leg 50 degrees This will produce an initial positioning similar to Figure 5 22 5 24 Manual printed October 30 2003 Tutorial Hebr may aa FFW ED I
20. o the floor so the floor will push back very hard cS NOTE When you move the pelvis on a human all of the other segments move also because they are all linked in a hierarchy where the pelvis is the dominating mass gt Return to the Event Editor by clicking on the 7 on the tool bar and change the Z position of the pelvis back to 4 6 gt Clear the event data by clicking the CI button on the tool bar gt Execute the event for two timesteps by clicking the button on the tool bar gt Confirm that the Output Results window appears the same as Figure 5 25 5 31 Manual printed October 30 2003 Tutorial Figure 5 28 Results report after additional changes For this example we will not spend any additional effort in attempting to produce smaller linear accelerations Once the initial equilibrium has been established the vehicle can then be positioned to the appropriate place in the environment with the appropriate orientation to match the event being modeled cS NOTE Recall that we changed the initial angles roll pitch and yaw values to zero degrees the velocity to zero and the crash pulse to zero in order to help us obtain the initial equilibrium of this human The next step is to apply a crash pulse to the vehicle This involves two parts 5 32 Manual printed October 30 2003 Tutorial Collision Pulse Chevrolet Caprice 4 Dr Talal Distance vs lime 1 00 0 75 0 50 0 25 Total Dustance
21. o the vehicle by pushing the left and middle mouse buttons at the same time Alternatively use the dolly thumb wheel located on the right lower portion of the viewer to slowly move closer to the vehicle until you are just inside the outer shell or mesh of the vehicle Your view will look similar to Figure 5 4 5 6 Manual printed October 30 2003 Tutorial Fir Edd dm Mee a A ee Deda i FE ew ro ITI a mog Lagon UA RES SomsTr po eii tate Ny EE ee co NG ridi asa F1 Mis Figure 5 4 Close up view of vehicle interior gt Adjust the zoom slider located on the bottom right portion of the viewing window or enter a number of approximately 100 to generate a wide angle view inside the vehicle similar to Figure 5 5 cS NOTE If you are having difficulty in completing this portion of the tutorial the file GATBcreateVehicles in your HVE supportFiles case directory contains all necessary information up to this point Manual printed October 30 2003 5 7 Tutorial bod Lit IEEE TENETE Dego to WEL UU EC Ho i s y KG LN eg S Lit RA Kh ES Pi far Figure 5 5 Close up wide angle view of vehicle interior Contact Panels The contact panels will be entered for the right front seat position in this Chevrolet Caprice This can be done using numerical values from the computer mesh if it has been measured in a CAD package such as AutoCADO AutoCAD can be used to examine the mesh and extract de
22. onfiguration and do not need to be changed for our tutorial Using the Option buttons click each button to choose the following vehicle from the database Type Passenger Car Make Buick Model Skylark Year 1985 199 Body Style 4 Door Click OK to add Buick Skylark 4 Dr to the active vehicles list Manipulate the view in the 3D viewing window to appear similar to that in Figure 5 2 Manual printed October 30 2003 Tutorial HRI ts KM Lone Mael Figure 5 2 View of Buick Skylark cS NOTE This view is in the 2 o clock position the camera is at the right front corner of the vehicle approximately 10 15 degrees above the XY plane making the vehicle clearly visible Now let s add the second vehicle involved in our collision for this tutorial gt Click the sign on the tool bar to add another vehicle gt Using the Option buttons click each button to choose the following vehicle from the database Type Passenger Car Make Chevrolet Model Caprice Year 1991 1997 Body Style 4 Door 5 5 Manual printed October 30 2003 Tutorial gt Click OK to add Chevrolet Caprice 4 Dr to the active vehicles list Manipulate the view in the 3D viewing window to appear similar to that in Figure 5 3 su wi RS LM tomo all 454 Day Mal Figure 5 3 View of Chevrolet Caprice gt Next with the hand manipulator selected from the right toolbar move the camera position closer t
23. pa po 7 po yr o oo fs o oo o pose OO tower x soo wo ms T Table 5 2 Contact Surfaces to use in Pedestrian impact example 5 38 Manual printed October 30 2003 Tutorial MEME EI seni i an Figure 5 30 Contact Surfaces on pickup See Figures 5 30 and 5 31 for different views of the exterior contact panels mai aa amp m E A TT EeERb Dr ia EI nay MEI IU eno he Figure 5 31 Contact Surfaces on pickup Manual printed October 30 2003 5 39 Tutorial Creating the Event gt Select the Event Editor by clicking the button on the tool bar V Click the sign on the tool bar to add an event The Information Dialog is displayed in Figure 5 32 Choose the Dodge Dakota 4x4 and the Male Adult 50 Wt 50 Ht from the Active Vehicles list and Active Humans list respectively Select GATB from the Calculation Methods options list Y Edit the Event name Pickup Pedestrian Impact Press OK to display the event editor Y Vv Y select Options from the menu bar and then Simulation Controls from the drop down menu Change the following options Simulation Output Time Interval sec 2 0 002 Simulation Maximum Time sec 1 0 Using the Event Editor dialog select the Dodge Dakota 4x4 from the Event Humans amp Vehicles list then select Edit from the menu bar choose Position Velocity and click Initial The vehicle is displayed at the
24. pper legs are I Ib sec inch 1 3599 Jy Ib sec inch 1 4348 K Ib sec inch 0 3769 cs NOTE If you are having difficulty completing this portion of the tutorial the GATBcreatePedestrian file in your HVE supportFiles case directory contains all necessary information up to this point Creating the Vehicle gt Choose Vehicle Mode by clicking the button on the tool bar The Vehicle Editor 1s displayed gt Click the sign on the toolbar to add a vehicle The Vehicle Information dialog is displayed The Vehicle Information dialog allows the user to select the basic vehicle attributes according to Type Make Model Year and Body Style gt Using the Option buttons click each button to choose the following vehicle from the database Type Pickup Make Dodge Model Dakota Year 1987 1996 Body Style Fleetside 4x4 gt Click OK to add Dodge Dakota 4x4 to the active vehicles list gt Create the exterior contact panels using the data from Table 5 2 cS NOTE Make sure to select Location Exterior when creating your contact surfaces or your pedestrian simulation will generate an error cS If you are having difficulty in completing this portion of the tutorial the file GATBcreateDodgeContacts in your HVE supportFiles case directory contains all necessary information up to this point Manual printed October 30 2003 5 37 Tutorial wm Com rime noe mid Materiel peu AS A Det Vie
25. ributes Figure 5 1 Location Front Right Sex Male Age Adult Weight Percentile 50 Height Percentile 5 Informatio ajx Human Mame Male Adul wt 50 Hi 5 Location Fiori Right Sex Male m Age dul Weight Percentile E Height Pescente 5 r Figure 5 1 Human Information dialog cS NOTE The passenger s position is assumed to be on the right side of the vehicle Manual printed October 30 2003 5 3 Tutorial NOTE Notice the human comes into the editor in a seated position If Pedestrian had been selected as the Location for the human then the human would appear in a standing position NOTE If you are having difficulty in completing this portion of the tutorial the file GATBcreateHuman in your HVE supportFiles case directory contains all necessary information up to this point Creating the Vehicles Now that we have our human let s add our vehicles gt 5 4 Choose Vehicle Mode by clicking on the button on the tool bar The Vehicle Editor is displayed Click the sign on the tool bar to add a vehicle The Vehicle Information dialog is displayed The Vehicle Information dialog allows the user to select the basic vehicle attributes according to Type Make Model Year and Body Style NOTE The Vehicle Information dialog also allows you to edit the Driver Location Engine Location Number of Axles and Drive Axle s These options affect the basic vehicle c
26. s are Toggles that switch between two different modes Make sure these options are set correctly To set the initial user options choose the following from the Options Menu Show Key Results Hide Axes Show Contacts Show Belt Anchors Hide Velocity Vectors Show Skid marks Hide Targets Turn AutoPosition On Units equals US Hide Grid Render Options V V VV v vv v NON Y Show Humans and Vehicles as Actual Phong Render Shading Mode Complexity equals Object Render Quality equals 5 Texture Quality equals Anti Aliasing equals gt Set Playback to 0 0333 sec The remaining options will automatically initialize to their default conditions We re now ready to proceed with the tutorial 5 2 Manual printed October 30 2003 Tutorial Creating the Humans To create the human occupant in the collision perform the following steps gt If the HVE Human Editor is not the current editor choose Human Mode by clicking the CA button on the tool bar First let s add the human occupant to the case 5 Click on the sign in the tool bar to add a human The Human Information dialog is displayed The Human Information dialog includes option buttons allowing the user to select a seat position within the vehicle alternatively Pedestrian could be selected and assign the human s attributes according to Sex Age Weight Percentile and Height Percentile gt Use the option buttons to choose the following human att
27. s p Do 20 0000 0 0000 in 20000 D 0000 D GANG 50 000000 I58 615928 D Co 3 isa Carati 15 8000 amp ann in conti e abond 00000 6 06000 45 927084 000000 4 Beck gi dat 5 0000 0 0000 n GOOD D OO 0 300065 A 000000 11 5440 50 0 000090 s Head Qa DD Da DEO D gonp Ca GANA Gr Dn TTI o e EI o IE 5 FIL 0 0000 gi 5 0000 O IO 0 40000 Da COCO PE 405074 PO SE 16 190716 7 RLL 5 SAN 50 794 1 37567 0 0000 0 0000 0 0000 LA EL mf ELI 14 499787 a RF A hir 135 491 od SOR D 00000 0 1000 0 oon of 311530 18 116044 og ANALES gt LOL 0509 100 6000 1 0000 0 60000 0 80000 6 00000 AD SETA 0 0115 16 190714 i ELE J 9 3 36 145 L 338T B Sect 6 bou 5 86608 B dTavyTR A A La doe To Bk EF li AA BASA Re ere Y y APLI KP Pa Me Wu Mg dhe LB NG AO di ET Pi Az FRA D dpi 35 0000 0000 D 20000 T 0000 0 20005 dr FOTI 36 835555 AI i ELE Ld Ca 74 749172 2X amp nRl f cnim TM sr Ti euim 3 ALENG sik TDT iA TAI 14 ESA i Dia 25 0000 5 0000 it 00000 DM isi t eo MITE AE cf Sa SS 15 LL La St Pa EE eo a 20006 LM pi Da PIO EL sas Le TRE La Fab 14 VER 0 00 0 6000 5 0006 0 00006 O emo 0 00000 6 000000 5 000090 0 000090 INERTIAL IEF TAL DET LAL LINRARB POJITION INCH LINEAR YELI T INCA SEC LINEAR ACCELERATIONS a BP TEGRERT R T a T E a T i Pala ee LR Bata adi hh f km A ati qf neri ih VERLA DNI ifi Vai Cd 2 Ada fd 60 ig a0 5 9264 6 200008 0 1065000 6 800006 1 315109 0 000000
28. same manner as the Right Front Seat Cushion panel The names and coordinates for the remaining panels can be found in Table 5 1 Ehe DH dum ee Gorni Hie A SINGA 6 Hy IA ME E CR T A ua EA Pees yr EET y B Zemn s f ee Demy Figure 5 15 Revised RF Seat Cushion contact surface 5 15 Manual printed October 30 2003 Tutorial Table 5 1 List of Contact Surface corner points 5 16 Manual printed October 30 2003 Tutorial cS NOTE The 3 points entered for each contact surface define a parallelogram contact surface For example the side window contact surface in this example is not rectangular in shape cS NOTE The GATB program will not calculate a force if the contact occurs in the areas of no contact demonstrated in Figure 5 16 STR E A MEE tra z maga IA lade Fire Men wc mi ANA of E AES PEE diet Dod Jm Er E gi er a i VENA na ag ONG z es D ETT ER TRU y ni MALE m ue r a Pag x s NO OA SA Ae Pal A i a E na em a ot Lo lied DR es oe a a ni E a itam PA E vw E Soc wy mo T Ca mW ex ate Call GE ci CONTACT 2 as Ci F x E uum vor r PAG a i EA E Mara RI an PI E EE ht ay DI 3 e iat ee O kana AA Via E af AA ACCU e 4 ero es mee oe iit m er EA a LARE tam Lor a r s Tog Ac Ed eas Sg ops CER RI TREE LL AS ta To ES vH PRU Pe ME a pak CANG e pos tee ig WU ee Sie NAG rua Ga Gi HA a LE pai r zt aec a m EE up DEP MEE
29. tailed measurements of the interior or it can be done visually which is the way we will proceed in this tutorial We will first position a contact panel for the seat cushion on the right front seat gt Click on the yellow ball representing the vehicle s center of mass by using the pointer mouse icon gt Select Contact Surfaces This brings up the Contact Surfaces dialog box as shown in Figure 5 6 gt Click on Add to add a contact surface cS NOTE The contact surface properties are selected by pressing on the Material button while the contact surface is listed Do this after naming and selecting the coordinates of the contact surface 5 8 Manual printed October 30 2003 Tutorial Contact Surfaces Chevrolet Caprice 4 Dr Figure 5 6 Contact Surfaces dialog in Vehicle Editor The contact surface properties for this example will be the default vehicle material as shown in Figure 5 7 Force vs Deflection Figure 5 7 Material Properties dialog in Vehicle Editor Manual printed October 30 2003 5 9 Tutorial cS NOTE The material values may not be exactly the same but choose the default material gt Enter the name RF Seat Cushion Hit Enter gt To create the surface for the right front seat cushion the following three points generate a surface with the correct orientation when viewed from the top Left front corner Kan
30. th of Field near 2 0 far 5000 Focal Length 50mm The new view of the vehicle and occupant for the vehicle affixed camera is shown in Figure 5 23 5 26 Choose Simulation Controls from the Options menu and change the following fields Output Interval Time sec 0 002 Maximum Time sec 0 25 Manual printed October 30 2003 Tutorial ame si a BE B mA fom oj 343 ey I files Figure 5 23 View of occupant from specified camera position Once this has been completed the occupant is close to equilibrium There is no acceleration pulse assigned at this point so the vehicle will travel at a continuous speed with no acceleration or deceleration We can now execute the simulation and examine how the occupant limbs move and adjust with the interacting forces from the contact panels cS NOTE Details of establishing an initial equilibrium for the occupant are beyond the scope of this simple tutorial cS In general the linear and angular accelerations of every mass segment should be as small as possible in comparison to the acceleration pulse that will be used cS In low speed collisions it is absolutely critical that the linear and angular accelerations be as close to zero as possible Manual printed October 30 2003 5 27 Tutorial The basic equilibrium requirement is that any motion caused by being slightly out of equilibrium 1s negligible compared to the motion caused by the crash As a practi
31. to study the passenger s behavior during impact gt gt gt Click the sign on the tool bar to add an event The Event Information dialog is displayed select Chevrolet Caprice 4 Dr and the Male Adult Passenger from the Active Vehicles list and Active Human list respectively select GATB from the Calculation Methods options list as shown in Figure 5 20 Enter the name RF Passenger for the event Press OK to display the event editor Now let s set up and execute the occupant simulation event using GATB 5 22 gt Using the Event Editor dialog select Chevrolet Caprice 4 Dr from the Event Humans amp Vehicles list Select Set up from the menu bar Select Position Velocity and click Initial The Chevrolet is displayed at the earth fixed origin In the Set Initial Position Velocity dialog for the Chevrolet Caprice enter the following data in the appropriate fields x ft 15 y ft 6 yaw deg 0 Click the Velocity is Assigned box in the Set Initial Position Velocity dialog and enter Total mph 0 NOTE Be sure to press lt Enter gt to apply the values displayed in the Position Velocity dialog Select Male Adult Human from the Event Humans amp Vehicles list Choose Position Velocity Initial from the Edit menu Manual printed October 30 2003 Tutorial Haba y EET naa Fem j jo sj Fee Dm Ta Pisi ae F1 o med Figure 5 20 Setting up the GATB event The hu
32. tt 0 00 0 0000 0 0000 0 0000 0 0000 0 0000 Pulse Dato Source META Pit Pon Figure 5 28 Collision Pulse dialog without a pulse The first part 1s to setup the initial speed of the vehicle to match that of the crash being simulated In this example recall from the EDSMAC4 run that the initial speed is 30 mph Go to the Event Editor by clicking on the button on the tool bar Choose the Chevrolet Caprice 4 Dr from the vehicles list Select Set up from the menu bar Select Position Velocity and click Initial Y VY VY VY Y Assign the Velocity to 30 mph Choose Set up from the menu bar and select Collision Pulse V The Collision Pulse dialog will appear like Figure 5 28 Manual printed October 30 2003 5 33 Tutorial At this point you may be prompted that warnings exist If you choose to look at those warnings they indicate that the yaw acceleration is higher than normal Accept these as possible wamirgs and when EVE asks you to see themagain Just claakce You will return to the Event Editor where you can now execute the event which demonstrates occupant motion in a frontal car crash A side view from the left side of the vehicle helps you to visualize the forward motion The camera setup for the left side view has the camera attached to the Chevrolet Caprice with the following camera coordinates Camera Coordinates x 1 10 gel Picture Center x 0 y 0 z l Depth of Field near 2 0 far
33. y 2 Z 2 Left rear corner x 15 Right rear corner x 18 See Figures 5 8 and 5 9 Donan Bind Material To 2 Face C Exterior C Group ca Comers Counter Clockwise Fast Middle Third Coordinate in x 20 4800 1800 Maternal Mame Defaut Vehicle Material Add Delete Surface Maternal ok cane Figure 5 8 Setting up RF Seat Cushion contact surface 5 10 Manual printed October 30 2003 Tutorial Figure 5 9 Contact Surface corners and selection order cS NOTE These corners must be entered in a counter clockwise order in order to create the positive side of the surface facing upward The positive side of the surface is the side of the surface that will be pushing the object cs NOTE There are other combinations that would produce a correctly oriented contact panel See Figures 5 10 through 5 12 for differing views of the contact panel just created Manual printed October 30 2003 Tutorial ELLE I T Fir Edd um See Geta POLE Deere ihi J Do B d DE do AU sond mom Lagos amp 2 1 ABOT AA amp LE Aci hiki B ETEA sara Dey hae LUE IE o Uu Arim DUC al li Ta uale Mf Pim dud um Caso orum POLE ee Dm E DOW IO 4e Joe ers Joel a 6 Az xa Da Tae w ao Less CEE FRESE j ej Coby nd ar Figure 5 11 RF Seat Cushion contact surface 5 12 Manual printed October 30 2
34. y is Assigned box in the Set Initial Position Velocity dialog and enter Total mph 30 Manual printed October 30 2003 Tutorial gt Choose Simulation Controls from the Options menu and change the following options Output time interval s 2 0 002 Vehicle trajectory s 0 001 Vehicle separation s 0 001 Maximum time s 0 5 IS NOTE We reduced the output interval because we re going to use the acceleration output from this simulation as the collision pulse for our occupant simulation Because we want more detail we select the smaller output interval This provides the acceleration at 0 002 second increments rather than the default value 0 1 second cS NOTE The entire duration of a collision is only about 0 1 second so the default interval might actually skip over the entire collision gt Using the Event Controller click on the tool bar to execute the event Allow the event to run until just after the vehicles separate then click on the tool bar to end the event cS NOTE The complete EDSMAC4 printouts for this tutorial are found in Appendix A cs NOTE If you are having difficulty in completing this portion of the tutorial the file GATBcreateEDSMAC4 in your HVE supportFiles case directory contains all necessary information up to this point Manual printed October 30 2003 5 21 Tutorial Occupant Simulation The EDSMAC4 event has provided us with the collision pulse Now let s use GATB
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