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1、CoupledSystemsMechanics,Vol.1,No.1(2012)39-5739Dynamicinteractionanalysisofactivelycontrolledmaglevvehiclesandguidewaygirdersconsideringnonlinearelectromagneticforces121Dong-JuMin,Jun-SeokLeeandMoon-YoungKim*1DepartmentofCivilandEnvironmentalEngineering,SungkyunkwanUniversity,Cheoncheon-Dong,Janga
2、n-gu,Suwon440-746,S.Korea2CivilEngineeringTeam,SamsungC&TCorporation,Seoch02-Dong,Seocho-Gu,Seoul137-956,S.Korea(ReceivedJanuary19,2012,RevisedFebruary27,2012,AcceptedMarch5,2012)Abstract.Thisstudyintendstoexploredynamicinteractionbehaviorsbetweenactivelycontrolledmaglevvehicleandguidewaygirdersby
3、consideringthenonlinearformsofelectromagneticforceandcurrentexactly.Forthis,governingequationsforthemaglevvehiclewithtendegreesoffreedomarederivedbyconsideringthenonlinearequationofelectromagneticforce,surfaceirregularity,andthedeflectionoftheguidewaygirder.Next,equationsofmotionoftheguidewaygirde
4、r,basedonthemodesuperpositionmethod,areobtainedbyapplyingtheUTM-01controlalgorithmforelectromagneticsuspensiontomakethemaglevvehiclesystemstable.Finally,thenumericalstudiesundervariousconditionsarecarriedouttoinvestigatethedynamiccharacteristicsofthemaglevsystembasedonconsiderationofthelinearandno
5、nlinearelectromagneticforces.Fromnumericalsimulation,itisobservedthatthedynamicresponsesbetweennonlinearandlinearanalysismakelittledifferenceinthestableregion.Butunstableresponsesinnonlinearanalysisunderpoorconditionscansometimesbeobtainedbecausethenominalair-gapistoosmalltocontrolthemaglevvehicle
6、stably.However,itisdemonstratedthatthisunstablephenomenoncanberemovedbymakingthenominalair-gaprelatedtoelectromagneticforcelarger.Consequentlyitisjudgedthatthenonlinearanalysismethodconsideringthenonlinearequationsofelectromagneticforceandcurrentcanprovidemorerealisticsolutionsthanthelinearanalysi
7、s.Keywords:maglev;guideway;dynamicinteraction;electromagneticsuspension(ems);activecontrol;surfaceirregularity1.IntroductionResearchonthemaglevvehiclesystemhasbeenprevalentsincethe1970sbecauseofthesuperiorexperie
