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1、单词复习：上一课回顾1Lesson1MechanicalDesign机械设计重点词汇：steadyoverlaplens/opticalfry/predetermine/settingpotentialparameter/parametricm3-cubicmetres2Paragraph1Formostofhistory,thedisciplineofmechanicaldesignrequiredknowledgeonlyofmechanicalpartsandassemblies.历史上大部分时间内，机械设计学科需要
2、的知识仅仅局限于机械零件及其装配。Butearlyinthetwentiethcentury,electricalcomponentswereintroducedinmechanicaldevice.但在二十世纪早期，电的部分被引入到机械设备中。3Sincethattimethedisciplinehasundergoneasteadytransformationfrompurelymechanicaltoelectro-mechanical(products).从那时起，这门学科经历了从纯粹的机械产品到机电产品的平稳转变
3、。However,nomatterhow“electronic”devicesbecome,theystillrequiremechanicalmachineryformanufactureandassemblyandmechanicalcomponentsforhousing.然而，设备无论电子设备如何发展，仍然需要机械设备用来制造和装配，需要箱体类的机械零件用来安装。4Additionally,nearlyallproductsrequiremechanicalinterface(人机接口)withhumans.另外所
4、有产品都需要机械的界面与人类交互。5Paragraph2:Inthe1960sand1970sanotherdisciplinewasaddedtoelectro-mechanicaldesign,namely,softwaredesign.在二十世纪六、七十年代，另外一个学科又加入到电动机械设计中来，也就是软件设计。Manyelectro-mechanicalproductsnowhavemicroprocessoraspartoftheircontrolsystem.许多机电产品现在都有作为它们控制系统一部分的微处理器
5、。6Consider,forexample,cameras,officecopiers,andourmany"smart"(智能的)toys.想想看！例如照相机、复印机及许多“聪明”的玩具。Theseproductshavingmechanical,electronic,andsoftwarecomponentsarecalledmechatronicdevices.具有机械的、电的、软件部分的产品称为机电设备。7Whatmakesthedesignofthesedevicesdifficultisthenecessity
6、fordomain(专业)anddesignprocessknowledgeinthreeoverlapping(相互交叉)butclearlydifferentdisciplines.这些设备设计的难度在于需要机、电、软三个相互交叉却又明显属不同学科的专业知识和设计过程知识。8ThedesignprocessParagraph3:Traditionallywhenwebreakdown(分解)mechanicalengineeringintoitsvariousaspects,wedecompose(分解)itbydis
7、cipline:fluids,thermodynamics,mechanicsetc.当我们按照传统的方式将机械工程分为各个方面时，我们将其分为各个学科：流体力学、热力学、机械学等。9Incategorizingthetypesofmechanicaldesignproblems,thisdiscipline-oriented(根据学科的)approachisnotappropriate.在对机械设计进行分类时，这种面向学科的方法已不再适用。Consider,forexample,thesimplestkindofdesi
8、gnproblem,aselectiondesignproblem.想一想！例如一种最简单的设计——选择设计。Selectiondesignmeanspickingone(maybemore)item(零部件)fromalistsuchthatthechosenitemmeetscertainrequi
