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《DESIGN AND MODELING OF SEMI-ACTIVE SQUEEZE FILM DAMPERUSING MAGNETORHEOLOGICAL FLUID 半主动挤压油膜阻尼器的设计与建模 磁流变液》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、th7InternationalConferenceonMotionandVibrationControlMOvIC04DESIGNANDMODELINGOFSEMI-ACTIVESQUEEZEFILMDAMPERUSINGMAGNETORHEOLOGICALFLUIDKeun-JooKimandChong-WonLeeCenterforNoiseandVibrationControl(NOVIC),DepartmentofMechanicalEngineeringKAIST,ScienceTown,Daejeon,305-701,KOREAgjkim@novic.kaist.
2、ac.kr,cwlee@novic.kaist.ac.krAbstractSqueezeFilmDampers(SFDs)havebeencommonlyusedtoeffectivelyenhancethedynamicbehavioroftherotatingshaftsupportedbyrollingelementbearings.However,duetotherecenttrendsofhighoperatingspeed,highloadcapacityandlightweightinrotatingmachinery,itisbecomingincreasing
3、lyimportanttochangethedynamiccharacteristicsofrotatingmachinesinoperationsothattheexcessivevibrations,whichmayoccurparticularlywhenpassingthroughcriticalspeedsorunstableregions,canbeavoided.Semi-activetypeSFDsusingmagnetorheologicalfluid(MRfluid),whichrespondstoanappliedmagneticfieldwithacha
4、ngeinrheologicalbehavior,areintroducedinordertofinditsapplicationstorotatingmachineryasaneffectivedeviceattenuatingexcessivevibration.Inthispaper,asemi-activeSFDusingMRfluidisdesigned,testedandmodeledbymeansofdescribingfunctionanalysistoinvestigatethecapabilityofchangingitsdynamicpropertiess
5、uchasdampingandstiffness.IntroductionSFDshavebeenfrequentlyusedtoovercomestabilityandvibrationproblemsthatcannotbeadequatelyresolvedbyconventionalrolling-elementorjournalbearingsalone.OneofthekeydesignfeaturesinaSFDconfigurationistheintroductionofsupportflexibilityanddampinginthebearing/supp
6、ortstructure.Hence,thedynamiccharacteristicsofSFDplayanimportantroleinthedynamicresponseofarotorsystem.IndesigningaconventionalSFD,anoptimizeddampingvalueobtainedbytheconsiderationofthefirstforwardmodeisusedtoimprovethestabilityofthesystem.However,thistraditionaldesignstrategybecomesobsolete
7、sincethemodernrotatingmachineryhasastrongtendencyofhighoperatingspeed,highloadcapacityandlightweight.Itresultsinoperationofarotoratarotationalspeedbeyondseveralcriticalspeeds,leadingtotheexcessivevibrationproblemsoccurringwhentherotorpassesthrought
