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1、机械专业中英文文献翻译RotaryUltrasonicMotorsActuatedByTravelingFlexuralWavesShyh-ShiuhLih,YosephBar-Cohen,JetPropulsionLaboratory,CaliforniaInstituteofTechnology,Pasadena,CA91109yosi@jpl.nasa.govand WillemGrandia,QualityMaterialInspection(QMI),CostaMesa,CA926271.ABSTRACTUltrasonicrotarymotorsarebeingdevelope
2、dasactuatorsforminiaturespacecraftinstrumentsandsubsystems.Thetechnologythathasemergedincommercialproductsrequiresrigorousanalyticaltoolsforeffectivedesignofsuchmotors.Ananalyticalmodelwasdevelopedtoexaminetheexcitationofflexuralplatewavetravelinginarotarypiezoelectricallyactuatedmotor.Themodeluse
3、sannularfiniteelementsthatareappliedtopredicttheexcitationfrequencyandmodalresponseoftheannularstator.Thismodelallowstodesignefficientultrasonicmotors(USMs)anditincorporatesthedetailsofthestatorwhichincludetheteeth,piezoelectriccrystals,statorgeometry,etc.Thetheoreticalpredictionsandtheexperimenta
4、lcorroborationshowedaremarkableagreement.Paralleltothiseffort,USMsaremadeandincorporatedintoaroboticarmandtheircapabilitytooperateattheenvironmentofMarsisbeingstudied. KeyWords:Actuators,ActiveMaterials,PiezoelectricMotors,UltrasonicMotors(USMs),StatorsandRotors,ModalAnalysis. 2.INTRODUCTION Ther
5、ecentNASAeffortstoreducethesizeandmassoffuturespacecraftarestrainingthespecificationsofactuationandarticulationmechanismsthatdriveplanetaryinstruments.Theminiaturizationofconventionalelectromagneticmotorsislimitedbymanufacturingconstrains.Generally,thesetypeofmotorscompromisespeedfortorqueusingspe
6、edreducinggears.Theuseofgearaddsmass,volumeandcomplexityaswellasreducesthesystemreliabilityduetheincreaseinthenumberofthesystemcomponents.Therecentintroductionofrotarypiezoelectricmotorsisofferingpotentialdrivemechanismsforminiatureinstruments[1-5].Thesemotorsofferhightorquedensityatlowspeed,highh
7、oldingtorque,simpleconstruction,canbemadeinannularshape(foropticalapplication,electronicpackagingandwiringthroughthecenter),andhaveaquickresponse.Astudyisunderwaytodevelopsuchmotorsforoperationatspaceenvironment,
