机械原理复习重点课件.ppt

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1、Chapter1Introduction第一章绪论1.1Themajorstudyobjectofthisbookismechanisms.本书研究的主要对象是机构。1.2Themostcontentofthisbookisfor“analysis”and“synthesis”ofsomecommonlyusedmechanisms.本课程研究的主要内容是一些常用机构的“分析”与“综合”.1.3StudypurposeTheknowledgetobeobtainedfromthisbookisafundamentalinanalyzingexistingmachine

2、sanddesigningnewones.通过本书学习获得的知识为分析現有的机器和設計新机器打下基礎.Foucsonfiveterminologies：Amachineisamechanicalsystemthatcantransmitortrans-formenergy,materialsorinformation.机器是一个可用来（有效地）传递或转换能量、物料或信息的机械系统。Amechanismisasystemoflinkswhichcantransmitortransformforceandmotion.机构（仅）是一个能传递或转换运动和力的构件系统。The

3、term“machinery”isusedtocoverbothmechanismsandmachines.“机械”一词用作机器和机构的总称。Nowyoumaybeknowwhy”MechenismsandMachineTheory”shouldbetranslatedinChinese-------机械原理Mechenismsandmachine--------机械，theory---------原理Big-endcover连杆头Couplerbody连杆体bolt螺栓nut螺母Linksarethebasicelementsinkinematics.构件是运动的单

4、元体。（构件是由一个或若干个零件组成。举例）Machineelementsarethebasicelementsofmanufacture.零件是加工制造的单元体。Therelationshipoffiveterms：Machinery–Machine–Mechanism–Link–MachineelementsBlankFilling:(Fillblankswithappropriateanswers.Onlyonechoiceiscorrectineachquestion.)1)()isasystemoflinkswhichcantransmitortransfo

5、rmforceandmotion.A）AmechanismB）AmachineC）AlinkD）Amachineelement2)()arethebasicelementsofmanufacture.A）AmechanismB）AmachineC）AlinkD）machineelements3)()isamechanicalsystemthatcantransmitortrans-formenergy,materialsorinformation.A）AmechanismB）AmachineC）AlinkD）AmachineelementThecompositiono

6、fprincipleandstructureanalysisChapter2Chapter2StructuralAnalysisofPlanarMechanism(Ifalllinksofamechanismmoveinplanesthatremainparalleltoeachother,wesaythemechanismisaplanarmechanism.Otherwise,itisaspatialmechanism.)2.1ThecompositionofamechanismLinks构件Kinematicpairs运动副LinksFixedlinks固定构件

7、-------Frames机架Movinglinks活动构件Drivinglinks主动件Drivinglinkshavetheirownindepen-dentmotioncharacteristicsDrivenlinks从动件2.1.2Kinematicpair运动副amobileconnectioniscalledakinematicpair.为了传递或转换运动，每个构件都要通过某种联接与其它构件时刻保持接触并产生相对运动。这种可动联接就称为运动副。1.Iftwopair-elementsofakinematicpairhavesurface