典型地区道路与EVP道路载荷谱当量关系及轿车后桥寿命数字化预测研究

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1、同济大学汽车学院博士学位论文典型地区道路与EVP道路载荷谱当量关系及轿车后桥寿命数字化预测研究姓名：彭为申请学位级别：博士专业：车辆工程指导教师：靳晓雄20041001ABSTRACTSTUDYONLOADNGSPECTRACORRELATIONOFEVPROADTOTYPICALROADSANDF．ATIGUELIFEDIGITALPREDICTl0NOFCAR’SREARAXLEABSTRACTLoadinghistoriesofcar’srearaxlearecollectedandanalyzedtogetthelo

2、adingspectraequivalentrelationshipsbetweentypicalroadsandSVWEVPprovinggroundinthispaper．FatiguelireofrearaxleofR～SSATB5ispredictedusingwheelforcescollectedinroadtestasinputdata．Thenewapproachcancontributetosubstantialtimeandcostsavingsduringproductdevelopmentproces

3、s．Accordingtocustomerusageinvestigation．conditionsoftypicalroadsandoperatingmodearedeterminedatfirst．SignalincludingwheelforcesandstrainsofrealaxlearecollectedatbothtypicalroadsandEVProad。蚴eelforcesaremeasuredbywheelforcetransducer(WFT)．Thestraingagesareplacedatcri

4、ticallocationsobtainedbythecombinationofFEManalysisandexperience．FEmodeliSverifiedandmodifiedbytestingresultsandFEManalysisofrearaxleiScardedout．The10adhistoriesale．incombinationwithresultofFiniteElementanalysisandmaterialpropertiespredictsthefatiguelifeofcar’Srear

5、axleusingstress—lifeapproach．Damageiscalculatedaccordingtothemethodofquasi—staticsuperpositionandmodalsuperpositionseparately．FatiguelifeobtainedbythemethodbasedonFEManalysisiscomparedandverifiedbythecalculatingresultofstrainsignalusingstrain-lifeapproach．Analysisa

6、ndsynthesisofmulti．axial10adsareemployedbasedonvertical，longitudinalandlateralforcescollectedinroadtestandcharacteristicsofdifferentroadarediscussed．Equivalentrelationshipsofloadingspectrabothintypicalroadandprovinggroundarecalculatedaccordingtopsudo—damageandreald

7、amageofstrainsignal．Correlationofroughroadandcustomercombinationroadtotracksofprovinggroundareaccqiredaccordingtomethodofroadcombination．Usingloadinghistoriesofforceacquiredinprovinggroundbywheelforcetransducerascontrolsignal，roadsimulationofacar’srearaxleiSprecede

8、donMTS8-DOFspindlecouplingroadsimulator．Theiterationresultcoincideswiiththeroadtestverywellprovethatrealroadloadisreproducedontestrig．ABSTRACTKEY