机电工程专业英语-朱林 杨杰.ppt
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1、CONTENTS,Lesson 1 Introduction to Machinery Design Lesson 2 Mechanisms Lesson 3 Machine Parts(I)Lesson 4 Machine Parts(II)Lesson 5 Engineering Graphic in the Third-angle Projection Lesson 6 Introduction to CAD/CAM/CAPP Lesson 7 A Discussion on Modern Design Optimization Lesson 8 Using Dynamic Simula
2、tion in the Development of Construction Machinery Lesson 9 Engineering Tolerance Lesson 10 Numerical Control,Lesson 11 Introduction to Heat Pipe Technology in Machining Process Lesson 12 Introduction to Material Forming Lesson 13 Material Forming Processes Lesson 14 Introduction to Mould Lesson 15 M
3、ould Design and Manufacturing Lesson 16 Heat Treatment of Metal Lesson 17 Virtual Manufacturing Lesson 18 Fluid and Hydraulic System Lesson 19 Product Test and Quality Control Lesson 20 Introduction of Automobile Engine,Lesson 21 The Automobile Components Lesson 22 Mechatronics Lesson 23 Industrial
4、Robots Lesson 24 An Army of Small Robots Lesson 25 Introduction to MEMS Lesson 26 DialogueAt CIMT Lesson 27 Virtual Manufacturing,Lesson 1 Introduction to Machinery Design 1.1 Text 1Machinery design is either to formulate an engineering plan for the satisfaction of a specified need or to solve an en
5、gineering problem.It involves a range of disciplines in materials,mechanics,heat,flow,control,electronics and production.,Machinery ComponentsThe major part of a machine is the mechanical system.3And the mechanical system is decomposed into mechanisms,which can be further decomposed into mechanical
6、components.In this sense,the mechanical components are the fundamental elements of machinery.On the whole,mechanical components can be classified as universal and special components.Bolts,gear,and chains are the typical examples of the universal components,which can be used extensively in different
7、machines across various industrial sectors.,Mechanical Design ProcessProduct design requires much research and development.Many concepts of an idea must be studied,tried,refined,and then either used or discarded.Although the content of each engineering problem is unique,the designers follow the simi
8、lar process to solve the problems.The complete process is often outlined as in Fig.1.1.,Fig.1.1 Design Process Model,Recognition of NeedSometimes,design begins when a designer recognizes a need and decides to do something about it.The need is often not evident at all;recognition is usually triggered
9、 by a particular adverse circumstance or a set of random circumstances,which arise almost simultaneously.Identification of need usually consists of an undefined and vague problem statement.,Definition of ProblemDefinition of problem is necessary to fully define and understand the problem,after which
10、 it is possible to restate the goal in a more reasonable and realistic way than the original problem statement.Definition of the problem must include all the specifications for the thing that is to be designed.Obvious items in the specifications are the speeds,feeds,temperature limitations,maximum r
11、ange,expected variation in the variables,and dimensional and weight limitations.,SynthesisThe synthesis is one in which as many alternative possible design approaches are sought,usually without regard for their value or quality.This is also sometimes called the ideation and invention step in which t
12、he largest possible number of creative solutions is generated.The synthesis activity includes the specification of material,addition of geometric features,and inclusion of greater dimensional detail to the aggregate design.,AnalysisAnalysis is a method of determining or describing the nature of some
13、thing by separating it into its parts.In the process the elements,or nature of the design,are analyzed to determine the fit between the proposed design and the original design goals.,EvaluationEvaluation is the final proof of a successful design and usually involves the testing of a prototype in the
14、 laboratory.Here we wish to discover if the design really satisfies the needs.The above description may give an erroneous impression that this process can be accomplished in a linear fashion as listed.On the contrary,iteration is required within the entire process,moving from any step back to any pr
15、evious step.,PresentationCommunicating the design to others is the finial,vital presentation step in the design process.Basically,there are only three means of communication.These are the written,the oral,and the graphical forms.A successful engineer will be technically competent and versatile in al
16、l three forms of communication.The competent engineer should not be afraid of the possibility of not succeeding in a presentation.In fact,the greatest gains are obtained by those willing to risk defeat.,Contents of Machinery DesignMachinery design is an important technological basic course in mechan
17、ical engineering education.Its objective is to provide the concepts,procedures,data,and decision analysis techniques necessary to design machine elements commonly found in mechanical devices and systems;to develop engineering students competence of machine design that is the primary concern of machi
18、nery manufacturing and the key to manufacture good products.,1.2 Words and phrases,machinery n.总称 机器,机械 trivial adj.琐细的,平常的,微不足道的 mechanism n.机构chain n.链(条),镣铐,一连串,一系列turbine blade n.涡轮机叶片crankshaft n.曲轴propeller n.推进者,推进物,尤指轮船、飞 机上的螺旋推进器discard v.丢弃,抛弃recognition n.识别trigger v.引发,引起,触发,vague adj.含糊
19、的,不清楚的synthesis n.综合ideation n 构思能力,思维能力,构思过程aggregate adj.合计的,集合的prototype n.样机,原型erroneous adj.错误的,不正确的iteration n.反复competent adj.有能力的,胜任的versatile adj.通用的,万能的,多才多艺的,1.3 Complex Sentence Analysis,1 Machinery design is either to formulate an engineering plan for the satisfaction of a specified nee
20、d or to solve an engineering problem.eitheror:或或 formulate:明确地表达,阐明机械设计用以阐明满足某种特殊需要的工程计划或解决具体的工程问题。2 It is important that the designer begins by identifying exactly how he or she will recognize a satisfactory alternative,and how to distinguish between two satisfactory alternatives in order to identi
21、fy the best.对于设计者来说,一开始就能准确判定出令人满意的设计方案,并能加以区别以选择最好的,这一点很重要。,3 And the mechanical system is decomposed into mechanisms,which can be further decomposed into mechanical components.be decomposed into:被分解为 which 引导一个定语从句,在从句中做主语,指前 面的 mechanisms。机械系统可以分解为机构,机构又可以进一步分解为机械零件。,1.4 Exercise 1.4.1Translate t
22、he Following Paragraphs,The practice of design can be one of the most exciting and fulfilling activities that an engineer can undertake.There is a strong sense of satisfaction and pride in seeing the results of ones creative efforts emerge into actual products and processes that benefit people.To do
23、 design well requires a number of characteristics.,1.4.2 Choose the proper answer to fill in the blank and translate the sentences,1They are using a()shovel to clear up the streets.2Many products are made by().3There is not a()who hasnt had this problem.4Machinery design involves a range of discipli
24、nes in materials,(),heat,flow,control,electronics and production.5The Allies finally smashed the Nazi war().,Lesson 2 Mechanisms 2.1 Text A mechanism is the members combination more than two or two connections with the members to realize the regulation motion made up by way of the activity.They are
25、the component of machinery.Activity connections between two members that have the relative motion are called the motion pairs.,Fig.2.1 Types of Cams,2.2 Words and phrases,mechanism n.机构motion pairs 运动副disposition n.配置;排列machine frame 机座,机架coordinate n.坐标motivity member 原动件parameter n.参变量driven membe
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