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1、BogieframedesigninconsiderationoffatiguestrengthandweightreductionBHParkandKYLeeSchoolofMechanicalEngineering,YonseiUniversity,Seoul,RepublicofKoreaThemanuscriptwasreceivedon8April2005andwasacceptedafterrevisionforpublicationon25November2005.DOI:10.1243/09544097F01405Abstract:Inthedevelopmentofab
2、ogie,thefatiguestrengthofabogieframeisanimportantdesigncriterion.Inaddition,weightreductionisrequiredinordertosaveenergyandmaterial.Inthisstudy,thefatigueanalysisofabogieframebyusingthefinite-elementmethodisperformedforvariousloadingconditionsaccordingtotheUICstandardsanditisattemptedtominimizeth
3、eweightofthebogieframebyartificialneuralnetworkandgeneticalgorithm.Keywords:bogie,strength,fatigueanalysis,neuralnetwork,optimization.1INTRODUCTIONAbogieinatrainisaveryimportantstructuralcomponentloadedbyvariousforcesintherailwayvehiclemotion.Themotionofarailwayvehicleisaffectbythegeometryofthetr
4、ack,theinteractionbetweenwheelsandrails,thesuspension,andtheinertiasofcomponentparts.Inthemeantime,theweightofabogiestructureshouldbeaslightaspossibleathigherrunningspeed.Therefore,thestrengthofthebogieshouldbecarefullycalculatedandanalysedbytheinternationalstandardssuchasUIC[1]andJIS[2],inordert
5、oobtainareasonabledesignscheme.Inthepastdesignprocess,thestepsofmanyexperiments,fieldtests,andprototypestoimproveandobtainareasonabledesignrequiredmuchtimeandhighcosts.Inthecomputer-aidedengineering(CAE)productdesignstep,however,thepracticaluseoffinite-element(FE)analysiscanreducethecostsandtime.
6、TheFEanalysisofthebogieframewasstudiedseveraltimes[3,4].Inaddition,thebogiehasalargeproportionofthetotalweightofavehicle.Savingsofenergyandmaterialarecurrentlydesigndriverstowardslightweightvehicleconstructions.In22CAEproductdesignstep,optimizationforweightreductionandapplicationoftheoptimalalgor
7、ithmcanmakethelightweightandtheconstraintconditionsforthefatiguestrengthsatisfy.Itisatypicalstructuraloptimizationproblemtominimizetheweightofthebogieunderthefatigueconstraint,buttheproblemcannotbesolvedbysimplyapplyin
