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附二:外文翻譯HighPreciseControlMethodforaNewTypeofPiezoelectricElectrohydraulicServoValveAbstract:Anewtypeofpiezoelectricelectro-hydraulicservovalvesystemwasproposedAndthenmultilayerpiezoelectricactuatorbasedonnewpiezoelectricceramicmaterialwasusedastheelectricity-machineconverteroftheproposedpiezoelectricelectro-hydraulicservovalve.Theproposedpiezoelectricelectro-hydraulicservovalvehasascendantperformancecomparedwithconventionalones.Butthesystemisofhighnonlinearityanduncertainty,itcannotachievefavorablecontrolperformancebyconventionalcontrolmethodTodevelopanefficientwaytocontrolpiezoelectricelectrohydraulicservovalvesystemAhighprecisefuzzycontrolmethodwithhysteresisnonlinearmodelinfeedforwardloopwasproposed.Thecontrolmethodisseparatedintotwoparts:afeedforwardloopwithPreisachhysteresisnonlinearmodelandafeedbackloopwithhigh-precisefuzzycontro1.ExperimentalresultsshowthatthehysteresisloopandthemaximumoutputhysteresisbythePIDcontrolmethodare4.22and211pm,respectively;thehysteresisloopandthemaximumoutputhysteresisbytheproposedcontrolmethodrespectivelyare074and037m,respectively;themaximumtrackingerrorbythePIDcontrolmethodforsinewavereferencesignalisabout502,themaximumtrackingerrorbytheproposedcontrolmethodforsinewavereferencesignalisabout085contro1Keywords:piezoelectricelectrohydraulicservovalve;hysteresisnonlinearity;Preisachmodel;fuzzycontrol1IntroductionElectrohydraulicservosystemiswidelyappliedinindustrialdomainnowadaysforexamplerobotdrive,machinebuilding,architecturalengineeringTheelectro-hydraulicservovalveisthekerneloftheelectro-hydraulicservosystem,anditsperformancehasdecisiveeffectOfthewholesystemTheconventionaldrivemodeofelectrohydraulicservovalvehaslowerresolutionandnarrowerworkbandwidth,whichrestrictstheapplicationsoftheelectro-hydraulicservovalveTheproposedpiezoelectricelectro-hydraulicservovalveadoptsmultilayerpiezoelectricactuatoraselectricity-machineconverter.ThisHewtypeofpiezoelectricelectro-hydraulicservovalvehasbetterdynamicperformancethanthatofconventionalonesAtpresent,withtheresearchandthedevelopmentofnew-typeactuatorbasedonnewtypematerials,itispossibletomakethenewelectricity-machineconverterwithhighfrequency.Newmaterialsincludepiezoelectricceramicmaterials,magnetostrjctivematerials,shapememoryalloysThereinto,multilayerpiezoelectricactuatorsbasedonnewpiezoelectricceramicmaterialshavemanymeritssuchassmallcubage,highresolution,highfrequencyandlargedriveforceHence,theyarewidelyusedinthemicro-positiondeviceofmachinetoolsandotherprecisionmachines1-6However,theyalsohavemanyshortcomings,for畢業(yè)設(shè)計(jì)(論文)第頁1example,hysteresisnonlinearitymodelinfeedforwardloopwasproposed2Workprincipleandcharacteristicofnew-typeofpiezoelectricelectro-hydraulicValveBecausethepullingforcecapacityofmultilayerpiezoelectricactuatorisverypoor,itcannotmaketheslidevalveoftheelectro,hydraulicservovalvebidirectionallvmove.Twomultilayerpiezoelectricactuatorswereadoptedtosolvethisproblem7-8.Theshortcomingofthismethodishighcostandsystemisdifficulttocontro1.Utilizingtherestoringforceofaleafspring,onemultilayerpiezoelectricactuatorcanrealizebidirectionalmovementoftheslidevalveinthispaper.Whenthevoltageimposedonmultilayerpiezoelectricactuator1sincreased,multilayerpiezoelectricactuatorwillelongateanddrivetheslidevalvetomovetowardstheleft,whichmakestheleafspringdeformOnthecontrary,whenthevoltageimposedonmultilayerpiezoelectricactuatorisreduced,multilayerpiezoelectricactuatorwillbeshortenedandthendrivetheslidevalvemovetowardstherightbytheactionoftherestoringforceoftheleafspring.ThestructureofnewtypeofpiezoelectricelectrohydraulicservovalveisshowninFig1Theinput-outputcharacteristicofthenewtypeofpiezoelectricelectro-hydraulicservovalvesystemindicatesthatithashysteresisnonlinearitywithnonloca1memory(seeFig2).AtanyreachablepointL(Ua,Ya)ininput-outputdiagram,thenumberofalternativecurvethatdescribesthefuturepathofhysteresisnonlinearitywithnonloca1memoryisinfinite.Namely,thefutureoutputofthesystemdependsnotonlyonthecurrentoutputYaandfutureinput,butalsoonthepasthistoryofinputvaluesextremum.Hence,theoutputresponseofnewtypeofpiezoelectricelectro-hydraulicservovalvetoanappliedinputvoltagebecomesunpredictable.Inthesystem,thereexistothernonlinearitiessuchasforceoffrictionandworkdeadzoneofvalve,furthermore,dampingcoefficientandoiltemperaturearealsochangedwithtimeThenonlinearityanduncertaintyhaveseriouslyeffectsonthepositionprecision.Toimprovetheperformanceofthenewtypeofpiezoelectricelectro-hydraulicservovalvesystem,avalidcontrolmethodisneeded3ControlalgorithmAtpresent,conventionalPIDcontrolleriswidelyappliedinindustrialcontroldomainbecauseofitssimplecontrolstructure,easydesignandinexpensivecostHowever,conventionalPIDcontrollerisdifficulttoachievegoodcontrolperformanceinthenewtypeofpiezoelectricelectro,hydraulicservovalvesystembecausethecontrolobjecthashigh畢業(yè)設(shè)計(jì)(論文)第頁2nonlinearityanduncertaintyFuzzycontrollershowsgoodresultsinthecaseofcontrollinghighnonlinearsystems.However,conventionalfuzzycontrollerisessentiallyakindofnonlinearPDcontroller,thereexistssteadystateerror,whichcannotmeetthedemandofhighpreciseofthesystemInthispaper,ahigh-precisefuzzycontrolalgorithmwithPreisachhysteresisnonlinearmodelinfeedforwardloopwasproposedTheblockdiagramofthecombinedcontrolisshowninFig3ThecontrolsystemiscomposedofafeedforwardloopbasedonPreisachmodelandafeedbackloopofhighprecisefuzzycontrollerUl(istheoutputoffeedforwardloopbasedonPreisachmode1Asalinearterm,itisselectedfromaPreisachfunctiontablebasedonthegivenpositionvalueU2(istheoutputofthehighprecisefuzzycontrollerThesumU(t)offeedforwardcontrolvoltagefandfeedbackcontrolvoltageU2(t),asultimatecontrolvoltage,isactedonnewtypepiezoelectricelectro-hydraulicservovalve.31FeedforwardloopbasedonPreisachmodelTheopenloopresponseofthenewtypepiezoelectricelectro-hydraulicservovalvesystemunderanarbitraryandnon-cyclicinputsignalisshowninFig2Thisphenomenonappearsashysteresisnonlinearitywithnonlocalmemory,whichcanbepredictedbyPreisachmode1ThenumericalformofPreisachmodelcanbewrittenasfoliows:ddtuutfS)(),()(1)Eqn.(1)canbeusedtocalculatetheresponseofthenewtypeofpiezoelectricelectro-hydraulicservovalvesubjecttoaknownarbitraryinputvoltagesequenceAseriesoffirstorderfunctionskkrofthenewtypeofpiezoelectricelectro-hydraulicservovalveareexperimentallydeterminedTheprocedureisasfollowsThespacebetweenzeroandsaturationvoltageUsisdividedintonequipartitions,andthevoltageofeveryequantpointiskUsn,wherek=-0,1,2,nVoltageisappliedfromzerotoeveryequantpointkUsn,andthendecreasedtozeroInthisprocess,thepositionoutputvaluesofthenewtypeofpiezoelectricelectro-hydraulicservovalvearerecordedateveryequantpointbetweenzeroandsaturationvoltageUs,therewith,kkrandthePreisachfunctiontableareobtained(seeFig4),畢業(yè)設(shè)計(jì)(論文)第頁3ddtuddutfStu)(),()((2)Basedonthedrivervoltagerangeofthenewtypeofpiezoelectricelectrohydraulicservovalve,thecoordinatespaceisselectedas0Ul50Vand0U150VFromFig4,thelimittriangleisdividedintoseveralsquaresandtrianglesDecreasingthesizeofthesquaresandtrianglesisexpectedtoincreasetheaccuracyofthemode1,however,itwillspendmassivecomputationaltimeBasedontheexperiments,nisselectedas5,namely,thesizeofeachofsidesofthesquaresandtrianglesisselectedas30V.BasedonthegivenpositionvalueandthenumericalformofthePreisachmodel,1)(nUtUor)(tUncanbeobtainedThereby,basedonPreisachfunctiontable,thecontrolvoltageUl(t)isobtainedwhen1nUliesontheverticallineorUliesonthehorizontallineFortheinexistencevoltageinthePreisachfunctiontableitcanbeobtainedbythelinearinterpolationIncomparisontoaconventionalfeedbackcontroller,themainadvantageofthismode1-basedfeedforwardcontrolleristhatitcancompensatethehysteresisnonlinearityofthesystemandachievehighlydynamicoperationatthesametime,andnoadditionalsensorisneededThisleadstoaverysimpleandinexpensivecontrolsystemThemaindrawbackofthefeedfo
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