汽车车桥的失效机理与可靠性分析

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1、华东交通大学硕士学位论文汽车车桥的失效机理与可靠性分析姓名：万正平申请学位级别：硕士专业：机械制造及其自动化指导教师：周新建20080410AbstractTheReliabilityAnalysisandFailureMechanismofAutomobileAxleABSTRACTNowadays,asscienceandtechnologydevelopsrapidlyandhigherqualitiesofproductsaredesiredincreasingly,reliabilitybecomesextraordinarilyimportantinscienceande

2、ngineering.InChina,automobileenterprisesrealizedthattoimprovethereliabilitiesoftheautomobilesisofgreatimportance.Reliabilityisoneoffatefulindexindesigninganautomobileproduct.Axleisoneoftheimportantpartsofanautomobile,andintensityisdecisivetothesafetyofthewholeautomobile.Thereareextensiveuncerta

3、infactorsforthereliabilityofmechanicalstructure.Therefore,it'llbemuchmoreaccordanttoconsideruncertainfactorsinthemechanicalstructuredesign.Thesafetyandreliabilityofmechanicalstructuresisoneofthemajorobjectivesofmechanicalstructuredesign.Thereliabilityanalysisofmechanicalstructurecanhelpthedesig

4、nertoestablishacceptabletolerancesonthemechanicalstructureandtogovernthefluctuationsofthesystemparametersforsafeoperations.Intheend,reasonablemechanicalstructurecouldbedesignedwithenoughreliabilityandlittlecost.ReliabilityanalysisandFEM(FiniteElementMethod)analysisisverycomplicated.BasedonMV(Me

5、anValue)、AMV(AdvancedMeanValue)、FORM(FirstOrderReliabilityMethod)、SORM（SecondOrderReliabilityMethod）、RSM(ResponseSurfaceMethod),andFEManalysissoftwareANSYSandreliabilitystochasticFEsoftwareNESSUSareusedtoanalyzethefailuremechanismandreliabilityoftheautomobilefrontaxleanddriveaxle.Firstofall,the

6、axlethreedimensionalmodelbuiltinPro/EwereimportedtoFEManalysissoftwareANSYSinwhichthestochasticparameterswereset.ThentheMPP(MostProbablePoint)andstructurereliabilityindex(minimumdistance)werecalculatedbythemethodofMV.Afterthat,othermethodswereusedtochecktogettheaccurateresults.Finallythereliabi

7、lityandthesensitivitiesofparametersisgained.Thecalculatedresultsinthepaperpointedouttheinnerconnectionbetweenthestructureandtheparametersandthemostimportantparameteraffectingthereliabilityoftheaxle.Themethodpresentedinthispaperpro