轿车白车身结构设计与优化

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1、万方数据江苏大学硕士学位论文ABSTRACTvehicleisasignificanttransportmeansinmodemsociety,andpeoplearemakingrequestsforhigherperformanceofvehicle．Themodemvehicledesignshouldmeettheprinciples：safety,NVH，energysavingandenvironmentalprotectionetc．BIW(BodyinWhite)isakeyassemblyof

2、car,itsreasonabledesignlaysfoundationfortheotherperformance．Withthedevelopmentofcomputertechnologyandperfectionofnumericalanalysistheory,CAEplaysmoreandmoreimportantrolesindesignprocessofBIW,andbeingappliedinthewholeprocessofvehicledesign．Thispaperismainlyab

3、outtheresearchonstiffnessandmodalanalysisoftheBIWofacertaincar,andthestudyintofreesizeoptimizationtechnologyandsensitivityanalysistechnology．Themaincontentsandachievementsofthispaperarelistedasfollowing：(1)Thispaperbrieflydescribesthedevelopmentandapplicatio

4、nofvehicleCAEtechnology,introducesthebasictheoryoffiniteelementmethodandtheapplicationinvehiclebodydesign．Thislaysthetheoryfoundationforthewholepaper．(2)ThispaperprobesintothemainprinciplesforFEAmodelingofvehiclebody：elementtype，geometrycleanup，elementqualit

5、ycontrol，linkingequivalence．Applyingbatchmeshingprogramandthemodularizationidea，theFEAmodelofBIWisconstructed．(3)AccordingtotheactualloadingconditionofBIW，thebendingstiffnessandtorsionalstiffnessareanalyzed，andtheperformanceiscomparedwithsimilarvehicles．This

6、offersthereferenceforthefollowingoptimization．(4)Thispaperintroducesfreesizeoptimizationtechnology．Withthestiffnesstargetvalueasconstraint，theminimummassasobject，thefreeIII万方数据轿车白车身结构设计与优化sizeoptimizationiSconducted．Fromtheresultsofoptimization，lt1Seasiertof

7、indouttheweakestareaoftheBIW．TheimprovementplansmerelyaddsO．07Kgweight，andthetorsionalstiffnessisimprovedby2723Nm／deg，whichachivesthetargetvalue．(5)Accordingtothevehicledynamicperformancerequirements，freemodalanalysisofBIWisperformed．Theweightedsumofcrucialm

8、odalfrequenciesisdefinedasobjectivefunction．Sensitivityanalysisandthecalculationoftherelativesensitivityarecarriedout，accordingtowhichthesensitivecomponentsaredetermined．Bymodifyingthethicknesse