畢業(yè)設(shè)計(jì)中英文翻譯學(xué)生姓名：學(xué)號：學(xué)院：專業(yè)：指導(dǎo)教師：200X年X月XXXXXXXXX機(jī)械工程與自動化學(xué)院機(jī)械設(shè)計(jì)制造及其自動化XXX名字，三號楷體外文資料MECHANISMSANDMACHINETHEORY1.IntroductiontoMechanism：Thefunctionofamechanismistotransmitortransformmotionfromonerigidbodytoanotheraspartoftheactionofamachine.Therearethreetypesofcommonmechanicaldevicesthatcanbeusedasbasicelementsofamechanism.1、Gearsystem,inwhichtoothedmembersincontacttransmitmotionbetweenrotatingshafts.2、Camsystem,whereauniformmotionofaninputmemberisconvertedintoanonuniformmotionoftheoutputmember.3、Planeandspatiallinkagesarealsousefulincreatingmechanicalmotionsforapointorrigidbody.Akinematicchainisasystemoflinks,thatis,rigidbodies,whichareeitherjointedtogetherorareincontactwithoneanotherinamannerthatpermitsthemtomoverelativetooneanother.Ifoneofthelinksisfixedandthemovementofanyotherlinktoanewpositionwillcauseeachoftheotherlinkstomovetodefinitepredictableposition,thesystemisaconstrainedkinematicchain.Ifoneofthelinksisheldfixedandthemovementofanyotherlinktoanewpositionwillnotcauseeachoftheotherlinkstomovetoadefinitepredictablepositionthenthesystemisanunconstrainedkinematicchain,Amechanismorlinkageisaconstrainedkinematicchain,andisamechanicaldevicethathasthepurposeoftransferringmotionand/orforcefromasourcetoanoutput.Alinkageconsistsoflinks(orbars),generallyconsideredrigid,whichareconnectedbyjoints,suchaspinCorrevolute)orprismaticjoints,toformopenorclosedchains(orloops).Suchkinematicchains,withatleastonelinkfixed,becomemechanismsifatleasttwootherlinksremainmobility,orstructuresifnomobilityremains.Inotherwords,amechanismpermitsrelativemotionbetweenitsrigidlinks；astructuredoesnot.Sincelinkagesmakesimplemechanismsandcanbedesignedtoperformcomplextasks,suchasnonlinearmotionandforcetransmissiontheywillreceivemuchattentioninmechanismstudy.Mechanismsareusedinagreatvarietyofmachinesanddevices.Thesimplestclosed-looplinkageisthefour-barlinkage,whichhasthreemovinglinks(plusonefixedlink)andfourpinjoints.Thelinkthatisconnectedtothepowersourceorprimemoverandhasonemovingpivotandonegroundpivotiscalledtheinputlink.Theoutputlinkconnectsanothermovingpivottoanothergroundpivot.Thecouplerorfloatinglinkconnectedthetwomovingpivots,therebycouplingtheinputtotheoutputlink.Thefour-barlinkagehassomespecialconfigurationscreatedbymakingoneormorelinksinfiniteinlength.Theslider-crank(orcrankandslider)mechanismisafour-barchainwithasliderreplacinganinfinitelylongoutputlink.Theinternalcombustionengineisbuiltbasedonthismechanism.Otherformsoffour-linkmechanismsexistinwhichasliderisguidedonamovinglinkratherthanonafixedlink.Thesearecalledinversionsoftheslider-crank,producedwhenanotherlink(thecrank,coupler,orslider)isfixedlink.Althoughthefour-barlinkageandslider-crankmechanismareveryusefulandfoundinthousandsofapplications,wecanseethattheselinkageshavelimitedperformancelevel.Linkageswithmoremembersareoftenusedinmoredemandingcircumstances.Howeveritisoftendifficulttovisualizethemovementofamultilooplinkage,especiallywhenothercomponentsappearinthesamediagram.Thefirststepinthemotionanalysesofmorecomplicatedmechanismsistosketchtheequivalentkinematicorskeletondiagram.Theskeletondiagramservesapurposesimilartothatoftheelectricalschematicorcircuitdiagram.Organizationmovementanalysissecondstep:Drawsagraphicchart,ismustdeterminetheorganizationthenumberofdegreesoffreedom.Basedondegreeoffreedom,butItalyrefersneedscertainindependentinputsthemovementnumber,bydeterminedorganizationallcomponentsareoppositeinthegroundposition.Thepeoplehavethousandsofdifferenttypesconceivablythelinkmotiongear.Youmayimagineabagcontainingmassivelinkmotiongearthecomponent:Twopolegroups,threepolegroups,fourpolegroupsandsoon,aswellascomponents,rotation,motion,camfollower,gear,toothchain,chainwheel,leatherbelt,beltpulleyandsoon.(Spheremovement,screwvice-aswellasthepermissionthreedimensionalrelativemotionotherconnectionsnotyetincludes,here,discussesinparallelplanesmerelyplanemotion).Moreoveryouconceivableputthesecomponentsvarioustypeslinkmotiongearpossibilitywhichformsinthesameplace.Howexistshelpsthepeopletocontrolformstheseorganizationstherule?Infact,themajorityorganizationdutyisrequestsasoleinputtotransmittoasoleoutput.Thereforethesingledegreeoffreedomorganizationusesmostonekindoforganizationtype.Forexample,namelymayseebytheintuition:Fourpoleorganizationsareasingledegreeoffreedomlinkmotiongear.Thepicturemotiondiagramandthedeterminationorganizationdegreeoffreedomprocess,isthemovementanalysisandthesynthesisprocessfirststage.Inthemovementanalysis,addsonitscharacteristicaccordingtotheorganizationgeometryshapewhichpossiblyknew(forexampleinputangle,speed,angleaccelerationandsoon)studiesthedeterminationconcreteorganization.Ontheotherhand,themovementsynthesisisdesignsanorganizationtocompletethedutyprocesswhichaninstituterequests.Inthis,choosestheneworganizationthetypeandthesizeisamovementsynthesispart.Conceivestherelativemotionability,canguessthereasonthatdesignsanorganizationthereasonandmakestheimprovementtoaconcretedesignabilityis