lsdyna学习资料—安全气囊.pdf

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1、AirbagAnalysisinLSDYNA©CopyrightLivermoreSoftwareTechnologyCorporationOutlinenIntroductionnAirbagTypesnGeneratingFEmeshnFabricModelingnDefinitionofControlVolumenAirbagLeakagenAirbagContactnAirbagtoStructureContactnPost-processing2IntroductionnPredictionofOccupantresponsene

2、cessitatesaccurateairbagmodelingnDifficultiesassociatedwithnumericalmodelingofairbagscanbebroadlyclassifiedasnSoftairbagpropertiesnSmallfabricthicknessnFoldingairbagsstilladifficulttaskÎatleastforapassengersidenDeterminationofleakageÎTestmeasurementÎParametricOptimizations

3、eemspromisingnContactcanbeanightmare3TypesofAirbag(1)nDriverSidenPassengerSidenSideCurtainAirbagn...4GeneratingAirbagMesh-Driver(1)nGenerallyit’sainitiallyflatcircularbag-foldedtopackagenMeshingmustconsiderfoldlinesnToachievethis,meshthesurfacesthatisalreadysplitaccounting

4、forfoldlinesnGeneratethemeshfromthesplit-surfaceswithanypre-processornMeshcouldbe4-nodedshellsor3-nodedtriasnIf3-noded,setESORT=1ninvokesC0shell5GeneratingAirbagMesh-Driver(1)nEnsurethemeshenclosesavolumennocracksorfreeedgesnRepresenttetherusingnonlineardiscretesprings6Gen

5、eratingAirbagMesh-PassengernFoldingapassengersideairbagisstillnotaccomplishedbyanypre-processornThealternativeistouseareferencetothefullydeployedbaggeometrynGeneratethemeshforthefullydeployedsurfacenScaleorResizetofitintocontainernUsefullydeployednodalcoordinatesastherefer

6、enceconfigurationnNoselfcontactisneeded!7AirbagMaterialnBestmodeledusing*MAT_FABRICnCanbeIsotropicorAnisotropicndependsontestdatanAlsoInvokesefficientmembraneformulation8ControlVolumenLSDYNAoffersseveraltypes9nSegmentlistnGaspropertiesnHeatCapacityatconstantvolumenHeatCapa

7、cityatconstantpressurenMassflowratenTemperaturerate10AirbagLeakagenVentingnconstantventorificearea,A23npressuredependent,LCA23nFabricPorositynconstantcoefficentntimedependent11AirbagSelfContactnAdditionallogicisneededtotreatairbagselfcontactnThenewlyimplemented,segmentbase

8、dcontact(SOFT=2),ismostrecommenednItignoresinitialpenetrationwhichissometimesunavoidablei