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 > DOC文档下载

外文翻译--机构和机器原理.doc

  • 资源星级:
  • 资源大小:64.50KB   全文页数:13页
  • 资源格式: DOC        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--机构和机器原理.doc

英文原文MECHANISMSANDMACHINETHEORY1.IntroductiontoMechanismThefunctionofamechanismistotransmitortransformmotionfromonerigidbodytoanotheraspartoftheactionofamachine.Therearethreetypesofcommonmechanicaldevicesthatcanbeusedasbasicelementsofamechanism.1、Gearsystem,inwhichtoothedmembersincontacttransmitmotionbetweenrotatingshafts.2、Camsystem,whereauniformmotionofaninputmemberisconvertedintoanonuniformmotionoftheoutputmember.3、Planeandspatiallinkagesarealsousefulincreatingmechanicalmotionsforapointorrigidbody.Akinematicchainisasystemoflinks,thatis,rigidbodies,whichareeitherjointedtogetherorareincontactwithoneanotherinamannerthatpermitsthemtomoverelativetooneanother.Ifoneofthelinksisfixedandthemovementofanyotherlinktoanewpositionwillcauseeachoftheotherlinkstomovetodefinitepredictableposition,thesystemisaconstrainedkinematicchain.Ifoneofthelinksisheldfixedandthemovementofanyotherlinktoanewpositionwillnotcauseeachoftheotherlinkstomovetoadefinitepredictablepositionthenthesystemisanunconstrainedkinematicchain,Amechanismorlinkageisaconstrainedkinematicchain,andisamechanicaldevicethathasthepurposeoftransferringmotionand/orforcefromasourcetoanoutput.Alinkageconsistsoflinksorbars,generallyconsideredrigid,whichareconnectedbyjoints,suchaspinCorrevoluteorprismaticjoints,toformopenorclosedchainsorloops.Suchkinematicchains,withatleastonelinkfixed,becomemechanismsifatleasttwootherlinksremainmobility,orstructuresifnomobilityremains.Inotherwords,amechanismpermitsrelativemotionbetweenitsrigidlinksastructuredoesnot.Sincelinkagesmakesimplemechanismsandcanbedesignedtoperformcomplextasks,suchasnonlinearmotionandforcetransmissiontheywillreceivemuchattentioninmechanismstudy.Mechanismsareusedinagreatvarietyofmachinesanddevices.Thesimplestclosedlooplinkageisthefourbarlinkage,whichhasthreemovinglinksplusonefixedlinkandfourpinjoints.Thelinkthatisconnectedtothepowersourceorprimemoverandhasonemovingpivotandonegroundpivotiscalledtheinputlink.Theoutputlinkconnectsanothermovingpivottoanothergroundpivot.Thecouplerorfloatinglinkconnectedthetwomovingpivots,therebycouplingtheinputtotheoutputlink.Thefourbarlinkagehassomespecialconfigurationscreatedbymakingoneormorelinksinfiniteinlength.Theslidercrankorcrankandslidermechanismisafourbarchainwithasliderreplacinganinfinitelylongoutputlink.Theinternalcombustionengineisbuiltbasedonthismechanism.Otherformsoffourlinkmechanismsexistinwhichasliderisguidedonamovinglinkratherthanonafixedlink.Thesearecalledinversionsoftheslidercrank,producedwhenanotherlinkthecrank,coupler,orsliderisfixedlink.Althoughthefourbarlinkageandslidercrankmechanismareveryusefulandfoundinthousandsofapplications,wecanseethattheselinkageshavelimitedperformancelevel.Linkageswithmoremembersareoftenusedinmoredemandingcircumstances.Howeveritisoftendifficulttovisualizethemovementofamultilooplinkage,especiallywhenothercomponentsappearinthesamediagram.Thefirststepinthemotionanalysesofmorecomplicatedmechanismsistosketchtheequivalentkinematicorskeletondiagram.Theskeletondiagramservesapurposesimilartothatoftheelectricalschematicorcircuitdiagram.OrganizationmovementanalysissecondstepDrawsagraphicchart,ismustdeterminetheorganizationthenumberofdegreesoffreedom.Basedondegreeoffreedom,butItalyrefersneedscertainindependentinputsthemovementnumber,bydeterminedorganizationallcomponentsareoppositeinthegroundposition.Thepeoplehavethousandsofdifferenttypesconceivablythelinkmotiongear.YoumayimagineabagcontainingmassivelinkmotiongearthecomponentTwopolegroups,threepolegroups,fourpolegroupsandsoon,aswellascomponents,rotation,motion,camfollower,gear,toothchain,chainwheel,leatherbelt,beltpulleyandsoon.Spheremovement,screwviceaswellasthepermissionthreedimensionalrelativemotionotherconnectionsnotyetincludes,here,discussesinparallelplanesmerelyplanemotion.Moreoveryouconceivableputthesecomponentsvarioustypeslinkmotiongearpossibilitywhichformsinthesameplace.HowexistshelpsthepeopletocontrolformstheseorganizationstheruleInfact,themajorityorganizationdutyisrequestsasoleinputtotransmittoasoleoutput.Thereforethesingledegreeoffreedomorganizationusesmostonekindoforganizationtype.Forexample,namelymayseebytheintuitionFourpoleorganizationsareasingledegreeoffreedomlinkmotiongear.Thepicturemotiondiagramandthedeterminationorganizationdegreeoffreedomprocess,isthemovementanalysisandthesynthesisprocessfirststage.Inthemovementanalysis,addsonitscharacteristicaccordingtotheorganizationgeometryshapewhichpossiblyknewforexampleinputangle,speed,angleaccelerationandsoonstudiesthedeterminationconcreteorganization.Ontheotherhand,themovementsynthesisisdesignsanorganizationtocompletethedutyprocesswhichaninstituterequests.Inthis,choosestheneworganizationthetypeandthesizeisamovementsynthesispart.Conceivestherelativemotionability,canguessthereasonthatdesignsanorganizationthereasonandmakestheimprovementtoaconcretedesignabilityislikethisasuccessfulorganizationscientistssymbol.Althoughtheseabilitiescomefromthecongenitalcreativity,howevermoreisbecausehasgraspedthetechnologywhichenhancesfromthepractice.1.1Themovementanalysissimpleoneofmostusefulorganizationsisfourpoleorganizations.Inonfollowingelaborationmajorityofcontentcentralismdiscussionlinkmotiongear,butthisprocedureisalsosuitableforthemorecomplexlinkmotiongear.Wealreadyknewfourpoleorganizationshaveadegreeoffreedom.Aboutfourpoleorganizations,hastheusefulmorecontentswhichmustknowIndeedissomeThesepulltheXiaohusbandcriterionincludingthestandard,thetransformationconcept,theblindspotpositiondivergencepoint,branchoffice,transmissionangle,withtheirsmovementcharacteristic,includingposition,speedandacceleration.Fourpoleorganizationsmayhaveonekindofbeingcalledascrankrockerorganizationform,onekindofdoublerockingleverorganization,onekindofdoublecranktensionbardoestheorganization,whichoneformsendiniscalledastheorganization,isdecidedintwopolemovementscopeswhichfixedcomponentconnectswiththerack.Thecrankrockerorganizationinputcomponent,thecrankmayrevolvethrough360°andthecontinuousrotation,butoutputsthecomponenttomaketheundulationmerelyi.e.swingmember.Asanexceptionalcase,intheparallelfourpoleorganization,inputsthepolethelengthtobeequaltooutputsthepolethelength,thegobetweenlengthandthefixedlinkracklength,alsoisequal.Itsinputandtheoutputallmaymakethecompletealternationrotationortransformthebeingcalledasantiparallelquadrangleorganizationtheoverlappingstructure.ThestandardpullstheXiaohusbandcriteriontheoremtoindicatethat,Ifinfourpoleorganizations,betweentwopolescandowillfullyrelativelyrotatescontinuously,that,itslongestpolelengthissmallerthansumofwiththeshortestpolelengthorisequaltosumoftheothertwopolelength.ShouldpayattentionThesamefourpoleorganization,mayhavethedifferentform,whichpoleisthisdecidedinwasstipulatedi.e.makesfixedlinkastherack.Themovementtransformationprocessisinthefixedorganizationtransmissionchaindifferentmemberhasthedifferentorganizationrateprocess.Besideshasaboutthecomponentrotationscopeknowledge,butalsomusthavehowcausestheorganizationbeforethemanufactureonenergytherevolutionthegoodmeasure,thatwillbeveryuseful.HardenberghHartenbergspeaksofTherevolutionisterminology,itssignificancepassestooutputsthecomponentthemovementvalidity.Itmeanttherevolutionissteady,inwhichcaninoutputinthecomponenttohaveastrengthorthetorquebiggestforcecomponentiseffective.Notonlyalthoughthefinaloutputstrengthorthetorquearetheconnectingrodgeometricfigurefunctions,moreoveralsoisgenerallythepowerortheforceofinertiaresult,thatisfrequentlybigtolikestaticstrengthseveraltimes.Inordertoanalyzetheidlingorinordertoeasytoobtainhowcancauseanyorganizationtherevolutiontheindex,thetransmissionangleconceptisextremelyuseful.Inorganizationmovementperiod,thetransmissionanglevalueischanging.Thetransmissionangle0°mayoccurinthespecialposition.Willoutputthepolebutinthisspecialpositionthemovementwithnottoexertinputsonthepolethestrengthmanytohavenothingtodowithgreatly.Infact,asaresultofthemovementvicefrictioninfluence,thegeneralbasispracticalexperience,withthetransmissionangleplanningboardwhichisbiggerthantherating.Theweightlinkmotiongeartransmissionmovementabilitymatrixfoundationdefinitionalreadystudied.Adeterminingfactorvalueitincludesregardingsomeassignsorganizationgraph,positionoutputmovementvariabletoinputvariablederivativeisathislinkmotiongearinconcretepositionmobilitycriterion.Iftheorganizationhasadegreeoffreedome.g.fourpoleorganizations,thenstipulatedalocationparameter,iftheinputangle,completelydeterminedthisorganizationstopspositionneglectbranchofficespossibility.Wemaystudyoneaboutfourpoleorganizationcomponentabsoluteangularpositionanalysisexpression.Whenanalyzescertainpositionsandorcertaindifferentorganizationtime,thiswillbemustbemuchmoreusefulthanthegeometricfigureanalysisprogram,becausethisexpressionwillcausetheautomatedcomputationeasytoprogram.Therealizationorganizationspeedanalysisrelativevelocitylawisthespeedpolygonisoneofseveraleffectivemethods.Thisendgoesagainstthespottorepresentonthe

注意事项

本文(外文翻译--机构和机器原理.doc)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