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ID:55953296
大小:115.16 KB
页数:14页
时间:2020-06-18
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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
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