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ID:6789718
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时间:2018-01-25
《机械专业毕业设计(论文)外文翻译-连杆机构》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、LinkmechanismLinkagesincludegaragedoormechanisms,carwipermechanisms,gearshiftmechanisms. Theyareaveryimportantpartofmechanicalengineeringwhichisgivenverylittleattention...Alinkisdefinedasarigidbodyhavingtwoormorepairingelementswhichconnectittootherbodiesforthepurposeoftransmitt
2、ingforceormotion. Ineverymachine,atleastonelinkeitheroccupiesafixedpositionrelativetotheearthorcarriesthemachineasawholealongwithitduringmotion. Thislinkistheframeofthemachineandiscalledthefixedlink.Anarrangementbasedoncomponentsconnectedbyrotaryorslidinginterfacesonlyiscalled
3、alinkage. Thesetypeofconnections,revoluteandprismatic,arecalledlowerpairs.Higherpairsarebasedonpointlineorcurveinterfaces.Examplesoflowerpairsincludehingesrotarybearings,slideways,universalcouplings.Examplesofhigherpairsincludecamsandgears.Kinematicanalysis,aparticulargivenmech
4、anismisinvestigatedbasedonthemechanismgeometryplusfactorswhichidentifythemotionsuchasinputangularvelocity,angularacceleration,etc. Kinematicsynthesisistheprocessofdesigningamechanismtoaccomplishadesiredtask. Here,bothchoosingthetypesaswellasthedimensionsofthenewmechanismcanbep
5、artofkinematicsynthesis.Planar,SpatialandSphericalMechanismsAplanarmechanismisoneinwhichallparticlesdescribeplanecurvesisspaceandalloftheplanesareco-planar.. Themajorityoflinkagesandmechanismsaredesignedasplanersystems.Themainreasonforthisisthatplanarsystemsaremoreconvenienttoe
6、ngineer. Spatialmechanismaarefarmorecomplicatedtoengineerrequiringcomputersynthesis. Planarmechanismsultilisingonlylowerpairsarecalledplanarlinkages.PlanarlinkagesonlyinvolvetheuseofrevoluteandprismaticpairsAspatialmechanismhasnorestrictionsontherelativemovementoftheparticles.
7、Planarandsphericalmechanismsaresub-setsofspatialmechanisms..Spatialmechanisms/linkagesarenotconsideredonthispageSphericalmechanismshasonepointoneachlinkagewhichisstationaryandthestationarypointofallthelinksisatthesamelocation. Themotionsofalloftheparticlesinthemechanismareconce
8、ntricandcanberepesentedbytheirshadowona-16-sphe
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