会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > PDF文档下载

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

  • 资源星级:
  • 资源大小:167.91KB   全文页数:8页
  • 资源格式: PDF        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

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

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.

注意事项

本文(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)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5