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1、BogieframedesigninconsiderationoffatiguestrengthandweightreductionBHParkandKYLeeSchoolofMechanicalEngineering,YonseiUniversity,Seoul,RepublicofKoreaThemanuscriptwasreceivedon8April2005andwasacceptedafterrevisionforpublicationon25November2005・DOI:10.1243/09
2、544097F01405Abstract:Inthedevelopmentofabogie,thefatiguestrengthofabogieframeisanimportantdesigncriterion.Inaddition,weightreductionisrequiredinordertosaveenergyandmaterial.Inthisstudy,thefatigueanalysisofabogieframebyusingthefinite-elementmethodisperforme
3、dforvariousloadingconditionsaccordingtotheUICstandardsanditisattemptedtominimizetheweightofthebogieframebyartificialneuralnetworkandgeneticalgorithm.Keywords:bogie,strength,fatigueanalysis,neuralnetwork,optimization・1INTRODUCTIONAbogieinatrainisaveryimport
4、antstructuralcomponentloadedbyvariousforcesintherailwayvehiclemotion.Themotionofarailwayvehicleisaffectbythegeometryofthetrack,theinteractionbetweenwheelsandrails,thesuspension,andtheinertiasofcomponentparts.Inthemeantime,theweightofabogiestructureshouldbe
5、aslightaspossibleathigherrunningspeed.Therefore,thestrengthofthebogieshouldbecarefullycalculatedandanalysedbytheinternationalstandardssuchasUIC[1]andJIS[2],inordertoobtainareasonabledesignscheme・Inthepastdesignprocess,thestepsofmanyexperiments,fieldtests,a
6、ndprototypestoimproveandobtainareasonabledesignrequiredmuchtimeandhighcosts.Inthecomputer-aidedengineering(CAE)productdesignstep,however^thepracticaluseoffinite-element(FE)analysiscanreducethecostsandtime.TheFEanalysisofthebogieframewasstudiedseveraltimes[
7、3,4].Inaddition,thebogiehasalargeproportionofthetotalweightofavehicle.Savingsofenergyandmaterialarecurrentlydesigndriverstowardslightweightvehicleconstructions.InCAEproductdesignstep,optimizationforweightreductionandapplicationoftheoptimalalgorithmcanmaket
8、helightweightandtheconstraintconditionsforthefatiguestrengthsatisfy・Itisatypicalstructuraloptimizationproblemtominimizetheweightofthebogieunderthefatigueconstraint,buttheproblemcannotbesolvedbysimplyapplyingt
