电动公交车变速器壳体的强度-分析与拓扑优化设计

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1、(4)Onthebasisofrelevanttheoryoffiniteelementanalysis，afiniteelementmodelofgearboxisestablishedbyusingABAQUS．Inordertosimplifytheloadingmethodofbearingload，themultipointcouplingconstraintsofMPCinthecenterofbearingholeisbuilt．Thenthesimplifiedbearingloadisappliedontheprimar

2、ynodes，andafiniteelementtransientdynamicsanalysisofhousingstructureiscarriedout．Throughtheanalysis，wehavefirstunderstandingofstressanddisplacementdistributionofhousingstructureandiudgewhetherthecaseneedstofurtheroptimizeaccordingtotheanalyticalresults．(5)Basedonthetopolog

3、yoptimizationtheory’theoptimizationdesignsofstaticstiffnessanddynamicscharacteristicforhousingstructureundervariousrunningconditionshavebeenperformedtoseektheload—carryingpathofstructure．Thus，theweaklinksandremianingregionsofstructurecanbefoundouttimely,andthentheoptimiza

4、tionschemecanbeproposed．Thefiniteelementtransientdynamicsanalysisofthecaseafteroptimizationisonceagianperformedtoverifywhetherthecasestillmeetsthedesignrequirementsofstiffnessandstrength．(6)BasedOiltherelevanttheoryoffiniteelementmodal，thedynamicperformanceanalysisoftheop

5、timizedgearboxhousingiscarriedout．Throughmodalanalysisofthehousing，thedataallowsUStounderstandthenaturalfrequencyandmodalshapeofhousingstructureandtocompareexternalexcitationfrequencywithgearmeshingfrequency．Thuswecanpreventtheresonanceofstructure．Finally,thefastFouriertr

6、ansformfortherotationspeedofdriveshaftandcontactforceofgeariscarriedouttostudythevibrationruleoftransmissiondrivesystem，thusprovidingthereferencebasisforthefaultdiagnosisofgearbox’Sinterior．Theresultsshowthatthegearboxhousingafteroptimizationnotonlymeetsthedesignrequireme

7、ntsofstiffnessandstrength，butalsoavoidstheresonanceofstructurewhentheweightofcasereducesabout10％，thusimprovingtheoverallperformanceofgearboxhousing．Theresearchtechniquesandtheresultsofthepresentpapercanprovidetheatheoreticalreferencefortheresearchanddevelopmentofgearboxho

8、usingofothertypes．Keywords：Gearbox；Multi-bodydynamicssimulation；Transientdynamicsanalysis；Topolo