资源描述：
《磁流变阻尼器 ppt》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、ProductsofLORDAudiTT(￥400,000-700,000)AudiR8(￥2320,000-2780,000)BuickLucerne(￥300,000-500,000)Ferrari599GTB(￥5000,000)HoldenHSVCommodore(￥1200,000-2000,000)地势MRF-122EG Magneto-RheologicalFluid•FastResponseTime–respondsinstantlyandreversiblytochangesinamagneticfield.•DynamicYieldStrength–provides
2、highyieldstrengthinthepresenceofamagneticfieldandverylowyieldstrengthintheabsenceofamagneticfield;allowsforawiderangeofcontrollability. •TemperatureResistant–performsconsistentlythroughoutabroadtemperaturerange,meetingtherequirementsofdemandingapplicationssuchasautomotiveshockabsorbers. •HardS
3、ettlingResistant–provideshighresistancetohardsettling;easilyredispersed(重分散). •Non-Abrasive(零磨损)–formulatedtonotabrade(损伤)thedevicesinwhichtheMRfluidisused.FeaturesandBenefitsWhataremagnetorheologicalfluids?Magnetorheologicalfluidsbelongtothegroupofsocalledcontrollablefluids.Thismeansthattheyex
4、hibitasignificantchangeintheirrheologicalbehaviourwhenanexternalmagneticfield(外部磁场)isappliedtothem.Theyareindeedcomposedofmicron-sizedmagneticparticles(微米级磁粒),locatedinsidealiquidcarrier,thatformchain-likestructureswhentheexternalmagneticfieldisapplied,resultinginanincreaseoftheapparentviscosity
5、(粘性)ofthefluid(Fig.1and2).Fig.1:Chain-likestructuresformationintheMRfluidunder anexternallyappliedmagneticfield(fromLORDcorporation)Fig.2:ChainsformationinadropofMRfluid(fromISCFraunhofer)TherheologicalbehaviourofMRfluidsisoftenrepresentedasaBinghamplasticmodelwithavariableyieldstrengthdepending
6、ontheappliedmagneticfieldH(Fig.3aand3b).Theflowisgovernedbytheequation:whereistheshearstress,istheshearstrainandistheviscosityofthefluid.TheoperatingrangeistheshadedareainFig.3c.Belowtheyieldstress(atstrainsoftheorderof10-3),theMRfluidbehavesviscoelastically:WhereGisthecomplexmaterialmodulus.Thi
7、smodelisalsoagoodapproximationforMRdevices.However,theactualbehaviourismorecomplicatedandincludesstiction(静摩擦)andhysteresis(磁滞现象)suchsuchasshowninFig.3.dFig.3:(a)and(b)Binghamplasticmodel,(c)Operatingrange,(d)Hystereticbehav
