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:2002210220;:2002211230:(5010308004,50038010):(1973-),,,:100021301(2002)06200962071,2(1.150090;2.150090):,,,,,,,,,,:;;:P315.966:AResponsetimeexperimentandanalysisofmagnetorheologicalfluidactuatorGUANXin2chun1,OUJin2ping2(1.SchoolofMaterialScienceandEngineering,HarbinInstofTechnology,Harbin,150090,China;2.SchoolofCivilEngineering,HarbinInstofTechnology,Harbin,150090,China)Abstract:Inthispaper,firstly,byanalyzingtheunstablestateofthemagnetorheological(MR)fluidthatbetweenparallelplatesafterrheologic,thecalculationtheoryofresponsetimeofdampingforceforMRfluidactuatorisbuilt.ThetheoryshowsthatthemaininfluencingfactorsofresponsetimeofMRfluidactuatorarethedynamicviscosityofMRfluidandthegapbetweenpistonandcylinder,theshearingfieldofMRfluidandthepressuredifferencebetweenbothendsofthepistondonotinfluencetheresponsetime.Bythetheory,theresponsetimeofMRfluidactuatorisestimatedtobeaboutmillisecond.Secondly,byquicklychanginginputelectriccurrentfromoneleveltoanother,theresponsetimeexperi2mentsofdampingforceforMRfluidactuatoraredone,andtheresultsshowsthattheresponsetimeisabouthundredsofmillisecond,morebiggerthanthetheoryresults.Finally,analyzingwiththetheoryshowsthatitistheairbubblesinthefluidthatdelaytheresponsetimeofMRfluidactuator.Keywords:magnetorheologicalfluidactuator;dampingforce;responsetime1,Bingham[1],,,[24]226200212EARTHQUAKEENGINEERINGANDENGINEERINGVIBRATIONVol.22,No.6Dec.,2002©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,,,,,Whittle[57],PowellBrookfield[8,,9],,Lord,[3],Whittle,,[1012],,,,211,,,,,,,,Bingham,,[3],,,Bingham,P0Bingham,,(P0+P1),P1,P0(P0+P1),;,(P0+P1),,Bingham,Bingham,,2.12.1.1,P,x,,y2(a),:u(y)=u0(1-y2)(1)u0=Ph28l,=4h2,Bingham,,y2(b),,,u(y)=u0+y2hc2-h|y|hc2(2a)796,:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.u(y)=u0(1-y2)+y|y|-h2hc2|y|h2(2b)yBingham;hc=2ylP2.1.2(1)2(a)P0,,,P1(3)52u(y,t)5y2=-f(t)+5u(y,t)5t(3)f(t)=P0+P1H(t)l,H(t)Heavyside(3)u(y)=u0(1-y2)u0=P0h28l;=4h2(3)u(y,t)=k=0(-1)k32u0(2k+1)33e-2k+1h2tcos(2k+1)hy+(P0+P1)h28l(1-y2)+323(-1)n(2n-1)3e-tncos(2n-1)yh(4)n=h2(2n-1)22(5),=(4),y(4)(5),,(h,(2)(P0+P1),Bingham,,,,(6)52u(y,t)5y2=-P0+P1l+5u(y,t)5t(6)(6)8922©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.u(y)=u0(1-y2)u0=(P0+P1)h28L;=4h2Bingham,y0=y0H(t)(7)H(t)Heavyside,(6)u(y,t)=u0(1-y2)-y0hn=1(-1)n+1n1-e(-tn)sin(2nyh)(8)n=h24n22(9)(8),y(9),,h,,,(4)(5)(9),h,yP2.21h12mm,L,,hh,LL(4),t,t,()(8),(,),1,0.026s1Binghamh/ml/m/Pa/s/(kgm-3)yy/PaP1/PaP2(Pa)0.0020.041120080001.261052.541053:(1),,;(2),,;(3),,;,,,0.0040.0020.001m/s,0-0.5A0-1A0-1.5A0-996,:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2A0.5-1A0.5-1.5A0.5-2A1-1.5A1-2A1.5-2A,,0.004m/s0.001m/s,0A2A0.5A2A33,0.156s3:(1),(2),0.3s63.2%,0.2s(3),,,,0.8s;63.2%00122©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,0.3s,4,,,,,Nakano[13],4,Nakano,,,P(s)H2(s)=Q01+Ts(10)P(s)H(s),Q0,Rn(s),Rn(s)=H2(s)(10)TT=Rn0VcK(11)Vc;K;Rn0,(11),2,,(11)6.5ms,2/Pa/m3s-1/m3/(Nm-2)3.91051.210-5410-42109Hayward,,[14]:Km=Vf/Va+Pa/PVf/Va+KfPa/P2Kf(12)Vf,Va;Pa;P;Kf,Km(11)(12),2,1%,7.1%,91.7;5%,1.5%,428,,,1016,:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.5:(1)(2)(3)0.2,,(4),,,:[1]RabinowJ.TheMagneticFluidClutch[J].AIEETrans,1948,67,1308-1315.[2]HousnerGW,BergmanLA,CaugheyTK,etal.StructuralControl:Past,Present,andFuture[J].J.EngineeringMechanics,1997,123(9):150-200.[3]CarlsonJD,CatanzariteDMandClairKASt.Commercialmagneto-rheologicalfluiddevices[A].Proc.FifthInt.Conf.onERFluids,MRFluidsandAssociatedTechnology[C].1995:20-28.[4],.[J].,1999,14(4):30-41.[5]WhittleM.ComputerSimulationofanElectrorheologicalFluid[J].JournalofNon-newtonianFluidMechanics,1990,37(3):233-263.[6]WhittleM,BulloughWA,FiroozianR,PeelDJ.ThePressureResponseinERValveFlow[A].ProceedingoftheConferenceonRecentAdvancesinAdaptiveandSensoryMaterialsandTheirApplications[C].1992:495-505.[7]WhittleM,AtkinRJandBulloughWA.DynamicsofanElectrorheologicalValve[A].In:TaoR,eds.Proc.FifthInt.Conf.onERFluids,MRFlu2idsandAssociatedTechnology[C].1995:100-117.[8]PowellJA.Modellingtheoscillatoryrespnseofanelectrorheologicalfluid[J].SmartMater.Strut.,1994,3(4):416-438.[9]BrookfieldDJDlodolZB.Transferfunctionidentificationofanelector-rheologicalactuator[A].Proc.FifthInt.Conf.onERFluids,MRFluidsandAssociatedTechnology[C].1995:300-317.[10],.[A].2000[C],200011,.[11],.[J].,1999,19(4):76-81.[12],.[J].,2001,21(1):5-8.[13]NakanoMandYonekawaT.PressureresponseofERfluidinapistoncylinderERvalvesystem[A].Proceedingof4thInternationalConference.onERFluids[C].1994:477-489.[14]HaywardATJ.AerationinHydraulicsystemsitsassessmentandcontrol[A],Proc.Conf.oilHydraulicPowerTransmission[C].1961:216-224.20122©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.