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1、Mechatronics18(2008)434–447ContentslistsavailableatScienceDirectMechatronicsjournalhomepage:www.elsevier.com/locate/mechatronicsDesignconsiderationsforanautomotivemagnetorheologicalbrakeKeremKarakoc,EdwardJ.Park*,AfzalSulemanDepartmentofMechanicalEnginee
2、ring,UniversityofVictoria,P.O.Box3055,STNCSC,Victoria,BC,CanadaV8W3P6articleinfoabstractArticlehistory:Inthispaper,designconsiderationsforbuildinganautomotivemagnetorheological(MR)brakearedis-Received10October2007cussed.Theproposedbrakeconsistsofmultiple
3、rotatingdisksimmersedinaMRfluidandanenclosedAccepted22February2008electromagnet.Whencurrentisappliedtotheelectromagnet,theMRfluidsolidifiesasitsyieldstressvariesasafunctionofthemagneticfieldapplied.Thiscontrollableyieldstressproducesshearfrictionontherotatin
4、gdisks,generatingthebrakingtorque.Inthiswork,practicaldesigncriteriasuchasmate-Keywords:rialselection,sealing,workingsurfacearea,viscoustorquegeneration,appliedcurrentdensity,andMRMechatronicdesignfluidselectionareconsideredtoselectabasicautomotiveMRbrake
5、configuration.Then,afiniteelementMagnetorheologicalfluidanalysisisperformedtoanalyzetheresultingmagneticcircuitandheatdistributionwithintheMRbrakeAutomotivebrakeMagneticcircuitconfiguration.Thisisfollowedbyamultidisciplinarydesignoptimization(MDO)procedureto
6、obtainFiniteelementanalysisoptimaldesignparametersthatcangeneratethemaximumbrakingtorqueinthebrake.AprototypeMultidisciplinarydesignoptimizationMRbrakeisthenbuiltandtestedandtheexperimentalresultsshowagoodcorrelationwiththefiniteBrake-by-wireelementsimula
7、tionpredictions.However,thebrakingtorquegeneratedisstillfarlessthanthatofacon-ventionalhydraulicbrake,whichindicatesthataradicalchangeinthebasicbrakeconfigurationisrequiredtobuildafeasibleautomotiveMRbrake.Ó2008ElsevierLtd.Allrightsreserved.1.Introduction
8、anism,and(iv)lowbrakingperformanceinhighspeedandhightemperaturesituations.TheautomotiveindustryhasdemonstratedacommitmenttoTheMRBisapureelectronicallycontrolledactuatorandasare-buildsafer,cheaperandbetterperformingvehicles
