Lesson 19 Introduction to machine design 机械专业专业英语教学用书教学教案.pptx
- 文档编号:963659
- 上传时间:2022-10-14
- 格式:PPTX
- 页数:14
- 大小:437.44KB
Lesson 19 Introduction to machine design 机械专业专业英语教学用书教学教案.pptx
《Lesson 19 Introduction to machine design 机械专业专业英语教学用书教学教案.pptx》由会员分享,可在线阅读,更多相关《Lesson 19 Introduction to machine design 机械专业专业英语教学用书教学教案.pptx(14页珍藏版)》请在冰豆网上搜索。
Lesson19Introductiontomachinedesign,Machinedesignistheapplicationofscienceandtechnologytodeviseneworimprovedproductsforthepurposeofsatisfyinghumanneeds.Itisavastfieldofengineeringtechnologywhichnotonlyconcernsitselfwiththeoriginalconception(最初的概念)oftheproductintermsofitssize,shapeandconstructiondetails,butalsoconsidersthevariousfactorsinvolvedinthemanufacture,marketinganduseoftheproduct.,Lesson19Introductiontomachinedesign,Peoplewhoperformthevariousfunctionsofmachinedesignaretypicallycalleddesigners,ordesignengineers.Machinedesignisbasicallyacreativeactivity.However,inadditiontobeinginnovative(革新的),adesignengineermustalsohaveasolidbackgroundintheareasofmechanicaldrawing,kinematics,dynamics,materialsengineering,strengthofmaterialsandmanufacturingprocesses.,Lesson19Introductiontomachinedesign,Asstatedpreviously,thepurposeofmachinedesignistoproduceaproductwhichwillserveaneedforman.Inventions,discoveriesandscientificknowledgebythemselvesdonotnecessarilybenefitpeople;onlyiftheyareincorporatedintoadesignedproductwillabenefitbederived.Itshouldberecognized,therefore,thatahumanneedmustbeidentifiedbeforeaparticularproductisdesigned.,Lesson19IntroductiontomachinedesignMachinedesignshouldbeconsideredtobeanopportunitytouseinnovativetalentstoenvisionadesignofaproduct,toanalyzethesystemandthenmakesoundjudgments(合理的判断)onhowtheproductistobemanufactured.Itisimportanttounderstandthefundamentalsofengineeringratherthanmemorizemerefactsandequations.Therearenofactsorequationswhichalonecanbeusedtoprovideallthecorrectdecisionsrequiredtoproduceagooddesign.Ontheotherhand,anycalculationsmademustbedonewiththeutmost(极度的)careandprecision.Forexample,ifadecimalpointismisplaced,anotherwiseacceptabledesignmaynotfunction.,Lesson19Introductiontomachinedesign,Gooddesignrequiretryingnewideasandbeingwillingtotakeacertainamountofrisk,knowingthatifthenewideadoesnotworktheexistingmethodcanbereinstated(使复职).Thusadesignermusthavepatience,sincethereisnoassuranceofsuccessforthetimeandeffortexpended.Creatingacompletelynewdesigngenerallyrequiresthatmanyoldandwell-establishedmethodsbethrustaside(推开).,Lesson19Introductiontomachinedesign,Duringthebeginningstagesofdesign,creativityshouldbeallowedtoflourishwithoutagreatnumberofconstraints.Eventhoughmanyimpracticalideasmayarise,itisusuallyeasytoeliminatethemintheearlystagesofdesignbeforefirmdetailsarerequiredbymanufacturing.Inthisway,innovativeideasarenotinhibited(抑制).Quiteoften,morethanonedesignisdeveloped,uptothepointwheretheycanbecomparedagainsteachother.Itisentirelypossiblethatthedesignwhichisultimatelyacceptedwilluseideasexistinginoneoftherejecteddesignsthatdidnotshowasmuchoverallpromise.,Lesson19Introductiontomachinedesign,Psychologistsfrequentlytalkabouttryingtofitpeopletothemachinestheyoperate.Itisessentiallytheresponsibilityofthedesignengineertostrivetofitmachinestopeople.Thisisnotaneasytask,sincethereisreallynoaveragepersonforwhichcertainoperatingdimensionsandproceduresareoptimum(这不是一件容易的工作,因为实际上并不存在着一个对所有人来说都是最优的操作范围和操作过程).,Lesson19Introductiontomachinedesign,Anotherimportantpointwhichshouldberecognizedisthatadesignengineermustbeabletocommunicateideastootherpeopleiftheyaretobeincorporated(一起工作的的).Initially,thedesignermustcommunicateapreliminary(预备的)designtogetmanagementapproval.Thisisusuallydonebyverbaldiscussionsinconjunctionwithdrawinglayouts(草图)andwrittenmaterial.Tocommunicateeffectively,thefollowingquestionsmustbeanswered:
Lesson19Introductiontomachinedesign,Doesthedesignreallyserveahumanneed?
Willitbecompetitivewithexistingproductsofrivalcompanies?
Isiteconomicaltoproduce?
(4)Canitbereadilymaintained?
(5)Willitsellandmakeaprofit?
Lesson19Introductiontomachinedesign,Onlytimewillprovidethetrueanswerstotheprecedingquestions,buttheproductshouldbedesigned,manufacturedandmarketedonlywithinitialaffirmativeanswers.Thedesignengineeralsomustcommunicatethefinalizeddesigntomanufacturingthroughtheuseofdetailandassemblydrawings.,Lesson19Introductiontomachinedesign,Quiteoften,aproblemwilloccurduringthemanufacturingcycle.Itmaybethatachangeisrequiredinthedimensioningortolerancingofapartsothatitcanbemorereadilyproduced.Thisfallsinthecategoryofengineeringchangeswhichmustbeapprovedbythedesignengineersothattheproductfunctionwillnotbeadverselyaffected.,Lesson19Introductiontomachinedesign,Inothercases,adeficiencyinthedesignmayapp
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- Lesson 19 Introduction to machine design 机械专业专业英语教学用书教学教案 机械 专业 英语教学 教学 教案
链接地址:https://www.bdocx.com/doc/963659.html