car crashing stepsWord文档格式.docx

car crashing stepsWord文档格式.docx

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lGeneratingtheBodySegments

lGeneratingtheJoints

lPosingtheHumanModel

lCreatingtheCarInteriorModel

lCreatingContactForces

lRunningtheEquilibriumAnalysis

lCreatingtheSeatbeltForces

lCreatingtheCrashPulse

lRunningtheSimulationfortheForwardHit

lRunningtheSimulationfortheRearwardHit

lInterrogatingtheResults

lFurther

GeneratingtheBodySegments

Inthisphasethehumanbodymodelisdevelopedandplacedinanenvironment.Thebodyconsistsof19segmentsand18jointswiththemasspropertiesofa5%ileUKmaleandthejointcharacteristicsoftheHybridIIIcrashdummy.

Step1:

Bringupsegmentspanelandsetfieldsforfirstbody

BegintheADAMS/ViewmodelingsessionandselecttheLifeMODbuttonatthebottomleftportionofthescreen.SelectSEGMENTSfromthemain-menuandCREATEBASESETfromthesub-menu.

Step2:

Createthebody

Joe.SethandstogripandgenerateafullbodymodelusingthePeopleSizedatabasefora5thpercentileUKmale.SelectOK,thenselectCREATEFULLBODYMODEL.

GeneratingtheJoints

Inthisphase,thehumansegmentscreatedinthefirstphaseareconnectedtogetherwithkinematicjoints.Atthesametimetorquefunctionsarecreatedateachjointdegreeoffreedom.ThetorquefunctioniscreatedfromtheHybridIIIdatabaseoftorquefunctions.Thetorqueisbasedonanonlinearjointstiffness,damping,frictionandhysteresis（losses）,specifictoeachDOFforeachjointasderivedfromthephysicalHybridIIIcrashdummy.

Step3:

Bringupjointcreatepanel

SelectJOINTSinthemain-menuandCREATEBASESETinthesub-menu.SelectHYBRIDIIICRASHDUMMYSTRENGTHCHARACTERISTICS.Enterascalefactorof.6,toscalethe50%strengthprofile.

Step4:

CreateHybridIIIstrengthjoints

SELECTALLbodyregionsandselectEXECUTE.Fromthissixpanelswillappeartocreatethejoint/torquesetsforeachregionofthebody（spinal,leftarm,leftleg,rightarm,rightleg）.

PosingtheHumanModel

WiththeAfterthejointsarecreatedonthemodelthepostureofthemodelmaybeadjusted,andthemodelmovedintoplace.Theposturemaybeadjustedbyrecallingoneofseveralposturesintheposturelibrarythenfurthermodifythejointanglesifnecessary.ThebodyismovedintoplacebyselectingtheLower_Torsosegmentandchangingthelocation.

Step5:

Bringupposturepanel

SelectPOSTUREonthemain-menuandCONFIGUREBASEMODELonthesub-menu.

Step6:

Putmodelinridingposture

SelectRIDINGastheStoredPostureandselectAPPLY.

Step7:

Rotatemodel

RepositionthemodelbymodifyingthelocationoftheLower_Torsosegment.EntertheADAMS/Viewcommand:

partmodrigidnamepart=.World.Joe_Lower_Torsolocation=0.0,-1.1687224256,-1.2047626433orientation=180.0,125.0,90.0rel=.World

CreatingtheCarInteriorModel

StandardADAMS/Viewtoolsareusedtocreatethecarinterior.TheseatiscreatedwiththefollowingADAMScommands（ortheusermayusestandardADAMS/Viewtools）.Simplegeometryisusedtorepresenttheseatandfloorofthecompartment.Markersarepositionedwiththez-axesnormaltotheplaneatthelocationsdisplayedinthefigure.Atranslationaljointiscreatedbetweenthismodelandthegroundtobeusedtoprovidemotiontothecompartmentfromthecrashpulse.

Step8:

CreateSeat

1.Createthecarcompartmentpartusingthefollowingcommand:

partcreaterigidnamepart=Sled

1.Createmarkersfortheseatbottomusingthefollowingcommands:

markercreatemarker=.World.Sled.seat1loc=-10,-4.88,14.94ori=90,90,270rel=.world

markercreatemarker=.World.Sled.seat2loc=-9.9,-5.78,-5.25ori=90,90,340

1.Createthegraphicsfortheseatusingthefollowingcommands:

geomcreateshapeblockblock=.World.Sled.Bseat1corner=.World.Sled.seat1dia=22.82,-2.43,20.15

geomcreateshapeblockblock=.World.Sled.Bseat2corner=.World.Sled.seat2dia=26.82,-2.66,20.15

geomattributesgeom=.World.Sled.Bseat1color=brown

geomattributesgeom=.World.Sled.Bseat2color=brown

Step9:

CreateFloor

lCreatemarkersfortheseatfloorusingthefollowingcommands:

markercreatemarker=.World.Sled.floor1loc=-9.9,0.98,38.27ori=90,90,225rel=.world

markercreatemarker=.World.Sled.floor2loc=-9.9,-9.24,28.43ori=90,90,270

lCreatethegraphicsforthefloorusingthefollowingcommands:

geomcreateshapeblockblock=.World.Sled.Bfloor1corner=.World.Sled.floor1dia=14.99,-0.87,20.15

geomcreateshapeblockblock=.World.Sled.Bfloor2corner=.World.Sled.floor2dia=14.99,-0.87,20.15

geomattributesgeom=.World.Sled.Bfloor1color=blue

geomattributesgeom=.World.Sled.Bfloor2color=blue

Step10:

CreateContactMarkersontheseatandfloor

1.Createthecontactmarkersontheseatandthefloor（seeFigure5）.

markercreatemarker=.World.Sled.seatC1loc=0.17,-4.76,4.29ori=180.0,90.0,270.0rel=.world

markercreatemarker=.World.Sled.seatC2loc=0.17,7.68,-9.96ori=180.0,20.0,180.0

markercreatemarker=.World.Sled.floorC1loc=0.17,-4.36,32.89ori=180.0,135.0,270.0rel=.world

markercreatemarker=.World.Sled.floorC2loc=0.17,-4.26,21.29ori=180.0,90.0,180.0

Step11:

Createatranslationaljointbetweenthesledandground

1.Createatranslationaljointbetweenthesledandground（seeFigure5）.

markercreatemarker=.World.Sled.tranloc=-0.5,-10.6,6ori=0,0,0rel=.world

markercreatemarker=.World.ground.tranloc=-0.5,-10.6,6ori=0,0,0rel=.world

constraintcreatejointtranjoint=.World.trani_mark=.World.Sled.tranj_mark=.World.ground.tran

CreatingContactForces

Contactforcesarecreatedonthemodeltoprovideaninteractionbetweenthehumanmodelandtheenvironment.Lifemodcontactforcesutilizeanellipsoid-platecontactalgorithmforefficientcalculationofthereactionofthebodysegmentstoimpactwiththeenvironment.Thegeneralformofthecontactforcefunctionis

Fn=k*（g**e）+Step（g,0,0,dmax,cmax）*dg/dt

where:

grepresentsthepenetrationtheellipsoidintotheplate

dg/dtisthepenetrationvelocityatthecontactpoint.

eisapositiverealvaluedenotingtheforceexponent.

dmaxisapositiverealvaluespecifyingtheboundarypenetrationtoapplythemaximumdamping

coefficientcmax.

Step12:

Bringupthecontactpanel

SelectCONTACTSonthemain-menuandCREATEBASESETonthesub-menu.

Step13:

Createthecontactforcesbetweenthesegmentsandtheseatbottom

Enter.World.sled.seatC1inthecontactsurfacemarkerfieldandsettheparametersasinFigure6.SelectRight_Hand,Right_Upper_Leg,Left_Upper_Leg,Left_Handasthecontactsegments.ThenselectAPPLY.

Step14:

Createthecontactforcesbetweenthesegmentsandtheseatback

Setthecontactmarkerto.World.sled.seatC2.SelectHead,Upper_Torso,Central_Torso,Lower_Torso,Right_Upper_Arm,Left_Upper_Arm.ThenselectAPPLY.

Step15:

Createthecontactforcesbetweenthefeetandthefloor

Setthecontactstiffnessto1e4.Setthecontactmarkerto.World.sled.floorC1.SelectRight_Foot_Single,Left_Foot_Single.SelectAPPLY.

Step16:

Setthecontactstiffnessto1e4.SetthecontactmarkertoWorld.sled.floorC2.SelectRight_Foot_Single,Left_Foot_Single.SelectAPPLY.

RunningtheEquilibriumAnalysis

Thesledisfixedtogroundandanequilibriumanalysisisperformedtoallowthehumanmodeltosettleintotheseatbeforetheseatbeltforcesareapplied.

Step17:

Createamotion=0onthesledtranslationaljoint

Createamotion（withvelocity=0）onthetranslationaljointbetweenthesledandgroundusingthefollowingcommand.

constraintcreatemotionmotion=.World.Impulsejoint=.World.tranfunction="

0"

Step18:

Bringupanalyzepanel

SelectANALYZEfromthemain-menuandDYNAMICSfromthesub-menu.

Step19:

Runthesimulation

Setthegravityvectorat-386inthenegativeYdirection.Runthesimulationfor1.0secondsand50timestepsusingthedefaultintegratorsettings.

Step20:

Animateequilibriumsimulation

SelectanimateontheADAMS/Viewmaintoolbox.

Step21:

Updatethemodelconfigurationwithstaticresults

SelectUPDATEPOSTUREWITHEQUILIBRIUMRESULTSbuttononthepanel.

CreatingtheSeatbeltForces

StandardADAMS/Viewtoolsareusedtocreatetheseatbeltforces（lapandshoulderbelt）betweenthesegmentsofthehumanmodelandthecarsled.Theforcesisatension-onlyforceproducedwhentheattachmentlocationsbetweenthehumanmodelandthesledexceedacertainvalue（slacklength）.

Step22:

Createtheattachmentmarkersbetweenthehumanmodelandthesled

1.Createtheseatbeltattachmentmarkersonthesled

markercreatemarker=.World.Sled.belt1loc=12,-10,-9ori=0,0,0rel=.World

markercreatemarker=.World.Sled.belt2loc=-12,-10,-9ori=