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外文翻译--磁流体对伺服阀力矩马达动态特性的影响 英文版.pdf外文翻译--磁流体对伺服阀力矩马达动态特性的影响 英文版.pdf -- 5 元

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MechanicalSystemsandSignalProcessingMechanicalSystemsandSignalProcessing2220081008–1015AbstractARTICLEINPRESSwww.elsevier.com/locate/jnlabr/ymssp08883270/seefrontmatterr2007ElsevierLtd.Allrightsreserved.doi10.1016/j.ymssp.2007.09.016C3Correspondingauthor.Tel./fax8645186418318.Emailaddresseslisongjinghit.edu.cnS.Li,baowenhit.edu.cnW.Bao.Asmagneticfluidsshowhighersaturationmagnetizationswhentheyareexposedtomagneticfields,theyarewidelyappliedintheareasofsealing,bearing,grinding,speaker,damperandsoon1,2.Investigationsin3–5showedthatthemagneticfieldstrengthinfluencedtheviscosityofmagneticfluidswhenmagneticfluidswereexposedtoamagneticfield.Theapplicationofmagneticfluidsinanelectricmotorwasalsostudiedin6becauseofthehighermagneticpermeabilityofmagneticfluids.Theapplicationofmagneticfluidsinhydraulicservovalveswasstudiedrecentlyin7.Hydraulicservovalvesarethenecessarycomponentsinhydrauliccontrolsystems.Thecharacteristicsofhydraulicservovalvessignificantlyinfluencetheperformanceofhydrauliccontrolsystems.Astheelectromechanicalmechanisminhydraulicservovalves,torquemotorsareusedtostrokethevalvesfromelectricsignals.Ifthedynamiccharacteristicsofatorquemotorcanbemodified,theperformanceofahydraulicservovalvecanbeimproved.Theaimofthispaperistoinvestigatetheinfluenceofmagneticfluidsonthedynamiccharacteristicsofahydraulicservovalvetorquemotor.Asakindoffunctionalmaterials,magneticfluidsarefilledintotheworkinggapsofahydraulicservovalvetorquemotorinthispaper.Forcesonthetorquemotorduetomagneticfluidsarestudied.Thedynamicmathematicalmodelsofthetorquemotorwithmagneticfluidsareintroduced.Afterthatthedynamiccharacteristicsofthetorquemotorwithmagneticfluidsareanalyzedandtested.Analysisandexperimentalresultsarecomparedwiththeresultswhenmagneticfluidsarenotappliedinthemotor.r2007ElsevierLtd.Allrightsreserved.KeywordsMagneticfluidsHydraulicservovalveTorquemotorHydrauliccontrolsystems1.IntroductionInfluenceofmagneticfluidsonthedynamiccharacteristicsofahydraulicservovalvetorquemotorSongjingLia,C3,WenBaobaDepartmentofFluidControlandAutomation,HarbinInstituteofTechnology,Box3040,ScienceandTechnologyPark,150001Harbin,ChinabSchoolofEnergyScienceandEngineering,HarbinInstituteofTechnology,Box458,150001Harbin,ChinaReceived13December2006receivedinrevisedform27September2007accepted27September2007Availableonline6October2007ARTICLEINPRESS12g,xlengthofgapatneutral,displacementoftheendofarmatureS.Li,W.Bao/MechanicalSystemsandSignalProcessing2220081008–10151009HmagneticfieldstrengthhthicknessofmagneticfluidssurroundingarmatureJainertiaofarmatureKamechanicaltorsionspringconstantofspringpipeKm,KtmagneticspringconstantandtorqueconstantoftorquemotorK0m,K0tmagneticspringconstantofmagneticfluid,torqueconstantofmagneticfluidMssaturationmagnetizationofmagneticfluidM0magnetomotiveforceduetopermanentmagnetNcturnsofcoilTdoutputtorqueoftorquemotorTploadtorqueduetospringpipeTLloadtorqueofarmatureNomenclaturearadiusofarmaturefrompivottocenterofpolefaceAgareanormaltofluxpathinairgapAmfworkingareaofdampingforceonarmatureduetomagneticfluidBaviscousdampingcoefficientofmechanicalarmaturemountingandloadF,Fdampingforceduetomagneticfluid,resistanceduetomagneticfluidSelfexcitedhighfrequencynoiseandpressureoscillationsappearveryfrequentlyintheflowfieldofaflapper–nozzleorajetpipeservovalveduetocavitationsandshearlayerinstabilitiesiftheconstructionparameterswerenotselectedcorrectly,asshownin8.Theselfexcitedpressureoscillationsmayirritatetheoscillationsofthetorquemotorarmatureandthespoolofaservovalvesothattheservovalvemayloseitsstability.Asmagneticfluidshaveahighersaturationmagnetizationandalargerviscositywhentheyareexposedtomagneticfields,magneticfluidscanbefilledintotheworkinggapsofahydraulicservovalvetorquemotortointroducedampingintothemotorandtheservovalve.Inthispaper,theapplicationofmagneticfluidsinahydraulicservovalvetorquemotorisintroduced.Mathematicalmodelsforforcesduetomagneticfluidsonthetorquemotorarestudied.Dynamiccharacteristicsofahydraulicservovalvetorquemotoraresimulatedandtestedwhenmagneticfluidsareappliedinthemotor.2.ConstructionofahydraulicservovalvetorquemotorwithmagneticfluidsTheconstructionofahydraulicservovalveandtorquemotorwithmagneticfluidsisshowninFig.1.TheequivalentmagneticcircuitofthetorquemotorisshowninFig.2.Ahydraulicservovalvecanusuallybedividedintothevalvepart,theflapper–nozzlepartandthetorquemotor.Thevalvepartincludesaspoolandavalvebody.Theflapper–nozzlepartincludesaflapperandtwonozzles.Thetorquemotorusuallyconsistsofcores,anarmaturesupportedbyaspringpipe,twocoilsandtwopermanentmagnets.Theflapperandthearmatureareconnectedwitheachotherandthereforenamedarmature–flappergroupsometimes.Tmf1loadtorqueduetoviscosityofmagneticfluidTmf2loadtorqueduetosaturationmagnetizationofmagneticfluidZ0viscosityofmagneticfluidintheabsenceofamagneticfieldZmfviscosityofmagneticfluidexposedtoamagneticfieldyrotationangleofarmatureo0rotationspeedofarmatureDidifferencecurrentofcoilsDp1,Dp2stressonarmatureduetomagneticfluidsingaps1and2ARTICLEINPRESSS.Li,W.Bao/MechanicalSystemsandSignalProcessing2220081008–10151010NSMagneticfluidsPermanentmagnetArmatureSpringpipeCoreQLQLValvebodyFeedbackrodSpoolFlapperNozzleTherearefourworkinggapsbetweenthecoresandthearmaturewheremagneticfluidscanbefilledinto.Asahydraulicservovalvetorquemotorworksunderthecooperationbetweenthepermanentmagnetsandtheelectricmagnets,therearealwaysmagneticfieldsduetothepermanentmagnetsinsidetheworkinggapsofthetorquemotor,eveniftheelectricpowerofthetorquemotoristurnedoff.Thereforemagneticfluidswillalwaysstayinsidetheworkinggapsaftertheyareapplied.Astherotationangleofthearmatureissmall,magneticfluidscanhardlybescatteredoutfromthegapswhenthearmaturerotates.Whenthepowerofthecoilsisturnedoff,thetorquemotorwillstayatthemiddlepositionundertheworkingofthepermanentmagnets.Ifthefourworkinggapsarealmostthesameindimension,thedistributionsofmagneticfieldswillbethesameinthefourworkinggaps.Theoretically,therewillnotbeanyoutputtorquefromthemotorbecausethetorquebalanceisachievedatthistime.Thenthehydraulicservovalvewillworkatthemiddleposition.Iftheelectricpowerofthecoilsisturnedon,thetorquemotorwillworkunderthecooperationbetweentheelectromagnetsandthepermanentmagnets.AsshowninFig.2,themagneticfluxdensitiesintheworkinggaps1and3willbeincreasedandbecomelargerthanthoseintheothertwoworkinggaps2and4.Therewillbeanoutputtorquesuppliedbythetorquemotortotheservovalve.Thetorquemotorarmaturewillrotateanddrivetheflaptointroduceapressuredifferencetobothsidesofthespool.ThespoolwillmovetoanewpositionuntiltheoutputtorqueofthemotorequalsthesumoftheloadtorquefromthespringpipeandtheReturnPSSupplyPSSupplyFig.1.Constructionofahydraulicservovalvewithmagneticfluids.NSNSNS1234gxg−xaθFig.2.Torquemotorequivalentmagneticcircuit.feedbacktorquefromthefeedbackrodduetothemovementofthespool.Thedisplacementofthespoolisproportionaltotheinputelectriccurrentofthetorquemotor.Asmagneticfluidsshowahighersaturationmagnetizationandlargerviscositywhentheyareexposedtothemagneticfieldsinsidetheworkinggapsofthetorquemotor,largedampingforcesorresistancewillbeexertedonthetorquemotorarmatureduetothespecialpropertiesofmagneticfluids.Thedampingforcesorresistancewillbehelpfultoimprovethedynamicperformance,especiallythestability,ofthetorquemotorandtheservovalve.3.ForcesduetomagneticfluidsTheworkingstateofmagneticfluidsinsidetheairgapsofatorquemotorareshowninFig.3.Itcanbeseenthatthecrosssectionofthearmatureissurroundedbymagneticfluidsentirely.Thereforethereareforcesworkingontheupsideanddownsidesurfacesofthearmatureduetothesaturationmagnetizationofmagneticfluids.Andtherearedampingforcesworkingontheleftsideandrightsideofthearmatureduetotheviscosityofmagneticfluids.3.1.ForcesduetotheviscosityofmagneticfluidsIfthecrosssectionofanarmaturealongthemagneticfluxinsidetheairgapsissurroundedbymagneticfluidsentirely,asshowninFig.3,therewillbeforcesworkingonthearmatureduetotheviscosityofmagneticfluidswhenthearmaturerotates.TheforceonthearmatureduetotheviscosityofmagneticfluidsisshowninFig.4.Theforcesworkasthedampingagainsttherotationofthearmature.ItcanbecalculatedasARTICLEINPRESSS.Li,W.Bao/MechanicalSystemsandSignalProcessing2220081008–10151011F1¼ZmfAmfdody.1Assumingthedistributionofrotatingspeedisuniformalongtheyaxis,thegradientofrotationspeeddo/dycanbesimplifiedasdo/dy¼o0/h,wheretherotationspeedofthearmatureo0canbewrittenaso0¼dy/dt.ω0F2F2F1F1coremagneticfluidarmatureω0Fig.3.Forcesonthetorquemotorarmatureduetomagneticfluids.hω0ωdωωxyF1ArmatureMagneticfluidFig.4.Forceduetotheviscosityofmagneticfluids.
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