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1、IEEETRANSACTIONSONCONTROLSYSTEMSTECHNOLOGY,VOL.16,NO.2,MARCH2008245ActiveVibrationIsolationUsinganElectricalDamperoranElectricalDynamicAbsorberSang-MyeongKim,StanislawPietrzko,andMichaelJ.BrennanAbstract—Thispaperdescribesatheoreticalandexperimentaltationofaskyhoo
2、kdamperforvibrationisolation,whereanac-studytoshowhowanelectricaldamperoranelectricaldynamictuatoriscollocatedwithasensorattachedtoapieceofequip-absorber,implementedusinganelectromagneticactuatorandanmentatoneendandsupportedbyabasestructureattheotheraccelerometer,
3、cancontrolvibrationtransmissionthroughavibra-(i.e.,structure-borneactuatorinstallation)[3].Foratrueskyhooktionisolator.Theelectricaldamperisrealizedbyfeedingbacktheequipmentvelocitytotheactuatorwithconstantgain.Theelec-dampertoberealized,thebasemotionshouldnotbeaf
4、fectedtricaldynamicabsorberisrealizedbyfeedingbacktheequipmentbythevibrationinducedbytheactuator(i.e.,aweaklycoupledaccelerationthroughasecond-orderlow-passfilter.Becauseitisbase).Insuchcases,structure-borneactuatorscanberegardedfoundthattheplantonaflexiblebaseisasy
5、mptoticallysimilartoasgroundedandtheelectricaldampersareexactlyequivalenttothatonarigidbase,theoptimalparametersofthecontrolfiltermechanicaldampers.Thecontrolsystemisthereforeuncondi-aredeterminedanalytically,independentofthebasedynamics.Ex-perimentalresultsshowtha
6、ttheelectricaldynamicabsorberhastionallystable.Kimetal.[4],[5]recentlyinvestigatedageneralasimilarperformancetotheelectricaldamper.Themaximumre-case,wherefourindependentskyhookdamperswereappliedtoductionintransmittedvibrationachievedwasabout38dBforbotheachoffourmo
7、untsconnectingapieceof3-Dequipmentandmethods.Itisalsoshownthattheelectricaldynamicabsorberisastronglycoupledbasestructure.Theyshowedthatthecontrolmorerobusttoundesirabledynamicsoutsidethecontrolband-mechanismandstabilityofthisgeneralcasearenotquitethesamewidth.Ano
8、theradvantageoftheelectricaldynamicabsorberisthatitdoesnotrequireanintegratortotransformaccelerationintoasthosediscussedin[3].Experimentalresultsdemonst
