大学机械专业英语情景对话

第一篇：大学机械专业英语情景对话

Mr.Liu:Come in ,please.刘先生：请进。

Mr.Bao:Good afternoon,Mr.Liu.包先生：.下午好，刘先生。

Mr.Liu:Good afternoon.Have a seat,please.刘先生：下午好，请坐。

Mr.Bao:Thank you very much.包先生：非常感谢。

Mr.Liu:Are you Mr.Bao?

刘先生：您是包先生吗？

Mr.Bao:Yes,I am.包先生：是的。

Mr.Liu:I have read your resume.I know you have worked for 3 years.Why did you choose to major in mechanical engineering?

刘先生：我看了你的简历，知道你已经工作过3年。为什么你选择了机械工程专业呢？ Mr.Bao:Many factors lead me to majoring in mechanical engineering.The most important factor is I like tinkering with machines.包先生：许多因素致使我选择了这个专业。最重要的一个因素就是我喜欢修理机器。Mr.Liu:What are you interested in about mechanical engineering?

刘先生：关于机械工程，你最感兴趣的是什么？

Mr.Bao:I like designing products and one of my designs received an award.Moreover,I am familiar with CAD.包先生：我喜欢设计产品，我的一份设计作品还得过奖。而且，我非常熟悉CAD。Mr.Liu:Great.Then what is your technical post title now?

刘先生：很好。那么你现在的技术职称是什么？

Mr.Bao:I’m a senior mechanical design engineer.包先生：.我现在是高级机械设计工程师。

MrLiu:Do you take the original certificate with you?

刘先生：你把证书原件带来了吗？

Mr.Bao:Yes.Here it is.包先生：.是的，给。

Mr.Liu:Why did you decide to apply for this position?

刘先生：为什么你决定申请这份岗位？

Mr.Bao:Your company has a very good reputation.I’m very interested in the field of your company.包先生：.贵公司声望很高。我对这领域也很感兴趣。

Mr.Liu:Well，thanks.I’ll let you know the result of the interview as soon as possible,Goodbye.刘先生：那好吧，谢谢你。我会尽快告诉你面试结果的，再见。

Mr.Bao:Thank you.I do hope the answer will be favorable.Goodbye.包先生：谢谢，我希望结果顺利。再见。

第二篇：大学机械专业英语总结

Unit 11 Machine tools have evoled from the early foot-powered lathes of the Egyptians and John Wilkinson’s boring mill.Most machining operations produce parts of differing geometry.Flat or plain surfaces are frequently required.Multiple-edged tools can also be used.The basic operations performed on an engine lathe are illustrated in Fig11-3.Those operations performed on external surfaces with a single point cutting tool are called turning.The objective of boring a hole in a lathe is:

1.Toenlarge the hole 2,Tomachine the hole to the desired diameter.3.To accurately locate the position of the hole.4.To obtion a smoth surface finish in the hole.Unit12 Broaching is a process for internal or external machining of falt, round, or contoured surfaces.Sawing is the parting of material by using metal disks, blades, bands, or abrasive disks as the cutting tools, Reaming is a machining process for enlarging, smoothing and/or accurately sizing existing holes by means of multiedge flutes cutting tools.Unit 13 Welding is essential to the expansion and productivity of our industries.Electroplating is a process in which a metal is deposited onto a metallic substrate.Soldering is the joining of metals by causing a lower-melting-point metal to wet or alloy with the joint surfaces and then freeze in place.Cleaning operations are performed both preparatory to and after finishing operations.Unit 14 Lathes are designed to rotate the workpiece and feed the cutting tool in the direction necessary togenerate the required machined surface.Vertical-boring machine

horizontal-boring machine

planning machine

horizontal-milling machine

vertical-milling machine Unit 15 AJM removes material through the mechanical cation of a focused stream of abrasiveladen gas.USM is a mechanical material removal process which is used to generate holes and cavities in hard or brittle workpieces.ECM is a process that removes material through the ptinciple of eiectrolysis.Unit 16 Group technology is a very important methodology in today’s manufacturing environment, particularly for batch production, and is becoming increasingly significant.For parts to be grouped based on either design characteristics and featuers or manufacturing processes, they must be classified into predetermined categories and coded for retrieval and use.Unit 17 Flexibility is an important characteristic in the modern manufacturing setting.Cellular manufacturing is the concept of organizing plant facilities and process planning for family-of-part manufactuer.Machine centers originsted out of their capability to perform a variety of machining operations on a workpiece by changing their own cutting tools.Software is the vital invisible element than actually drives the FMS.There are two basic levels of software required for an FMS: 1:operating system 2:application software Unit 18 Computer integrated manufacturing is the term used to describe the modern approach to manufacturing.Management is the process of making directing the activities of personnel to achieve stated objectives.An AGV is a computer-controlled, driverless vehicle used for transporting materials form point in a manufacturing setting.In any discussion of AGVs, three key terms are frequently used: 1:Guide path.2:Routing.3:Traffic management.Unit 19 Part acquisition time is highly dependent on the nature of the layout of the assenmbly area and the method of assembly.Assembly in the manufacturing process consists of putting together all the component parts and sub-assemblies of a given product, fastening, performing inspections and functional tests, labeling, separating good assemblies from bad, and packaging and or preparing them for final use.Unit 20

Automation is a widely used term in manufacturing.Fixed automation is what Harder was referring to when he coined the word automation.Numerical control can be defined as a form of programmable automation in which the pross is controlled by numbers, letters, and symbols.The program of instructions is the detailed step-by-step set of directions which tell the machine tool what to do.The highest degree of automation obtainable with special-purpose, multifunction machines is achieved by using transfer machines.

第三篇：机械专业英语

机械专业英语杨亚炬 20100334506

机电103班

考虑磨削力的磁悬浮磨床电主轴转子系统动态特性分析

摘要:以电磁轴承支承的磨床也主轴为研究对象，建立了转子的弹性支承模型，对其进行了模态分析，得出转子固有频率随支承刚度变化的规律;对施加磨削力时转子的稳态响应特性进行了分析，根据危险界面的节点位移，初步确定了主轴系统的稳定性。

关键词:电磁轴承支承系统;磨床电主轴;模态分析;稳态响应特性 引言

电磁轴承具有无摩擦、元磨损、高速度、高精度及可长期免维护等优点，因此被广泛应用于高速旋转类机械中。采用电磁轴承支承的磨床电主轴是典型的机电一体化系统，由于磨削过程的复杂性，其支承主轴系统的影响与其他轴承相比更为突出[1 刀。转子的动态特性是电磁轴承支承特性与转子结构动力学特性综合作用的结果。在对转子实施控制之前，研究转子本身的动力学行为对控制系统的设计是很重要的时。本文以某电磁轴承支承的磨床电主轴为研究对象，建立了转子的弹性支承模型，对其进行了模态分析和施加磨削力时的稳态响应特性分析。轴、砂轮连接杆、前后径向轴颈套、前后平衡环、止推盘和隔磁环等组成，其他部件与转轴之间采用过盈连接。

转子总重5.90kg，总长507mm，稳定悬浮时转子和径向轴承之间的间隙为0.2mm，轴向轴承

1.砂轮2 传感器3.前辅助轴承4.前径向轴承5.转轴6.轴向轴承7.冷却水套

8.电机部分9.后径向轴承10.后辅助轴承间隙为0.3mm。建立有限元模型

电磁轴承支承为典型的弹性支承，有限元分析模型采用16 个弹簧单元模拟径向电磁轴承的16 个磁极。止推盘两侧分别采用8 个弹簧转轴 根据转子的结构形式，用ANSYS 建立起转子的实体有限元分析模型，模态分析

支承刚度对转子固有频率的影晌根据转子的有限元分析模型，用ANSYS 对其进行模态分析[5J。忽略弹簧单元的阻尼，支承刚度在5X106~lXI09N/m 范围内变化阶模态，得到转子的正进动固有频率和负进动固有频率，进一步研究临界转速时，首先剔除负进动固有频率[6J。可以得到转轴前四阶固有频率随刚度变化曲线,转子的正进动固有频率随支承刚度的增大而增大，且转子的低阶固有频率随支承刚度增加的幅度较大。当支承刚度增大到1.6X10 8 N/m 时，转子的2~4 阶固有频率已无多

模态分析完毕后，将磨削激振力施加于砂轮 处进行谐响应分析，在砂轮外圆节点7746 处施加Y 方向力(实部为88.328N、虚部为1.9737N)和Z 方向力(实部为1.9737N、虚部为88.328N)，这样磨削力为一简谐力。COMBIN14 单元的刚度取2.0X10 7 N/m，为分析转子在高频段的响应，将激振力的频率范围扩大至0~1600Hz，分20 个载荷步进行谐响应分析。

当主轴工作在30000r/ min(对应额定工作频率500.0Hz)、48 OOOr/ min(对应最高工作频率800.OHz)，即转速处于一阶与二阶临界转速之间时，由转子的二阶振型(图5)可以看出，转子在砂轮、前保护轴承、前径向轴承和后径向轴承处的中心截面为危险截面。图7~ 图10 分别为砂轮、前保护轴承、前径向轴承和后

径向轴承处的振动幅值一频率响应后径向轴承处节点4484 振动幅值一频率响应曲线移增大幅值在一阶固有频率处最小，二阶固有频率处最大，三阶固有频率处次之。

磨床电主轴的结构参数如下:转子与前后保护轴承的间隙为O.lmm，与前后径向轴承的间隙为0.2mm。由表3 可知，当激振力频率达到转子一阶、三阶固有频率时，转子产生的共振位移在转曲线，在有限元模型上分别对应节点7746、7818、7559 和4484 的振动幅值频率响应。各危险截面的节点Y 方向位移如表3 所示。当激振力频率达到转子的固有频率时，转子的位移(振动幅值)会突然增大，通过前三阶的幅频响应曲线可以看出，转子位子间隙范围之内;但达到转子二阶固有频率时，转子产生的共振位移会超出间隙要求，使得转子与轴承碰撞，发生危险，因此应避免激振力频率达到转子的二阶固有频率。由转子的二阶振型可以看出，转子在后保护轴承处的径向位移小于后径向轴承处的径向位移，故可判定后保护轴承处在Y 方向的位移小于

2.0 X 10 一7 m。各危险截面的节点位移均在间隙范围内，因此可初步判定转子在额定转速和最高

转速下工作时，给其施加Fn = 88.328N、Ft =1.9737N 的磨削力，可稳定工作。结论

(1)完全弹性支承下，电主轴转子固有频率的总体变化趋势随支承刚度的增大而增大，并且在支承刚度较低时，固有频率随支承刚度的变化较大。当支承刚度到达一定值时，转子的前四阶固有频率趋于稳定，在设计控制系统时可控制轴承的刚度高于此值，以便转子具有稳定的临界转速。

(2)在施加了磨削激振力后，通过幅值频率响应分析确定了几个危险界面的节点位移，可初步判断主轴系统的稳定性。

Dynamic Analysis for Electric Spindle Rotor System of Magnetic Levitation Grinder

Considering Grinding Force

Abstract: This paper bui1t an elastic bearing model for the rotor of grinder electric spindlesupported by electromagnet bearing and analyzed the mode of the rotor , educed the laws about therotor inherent frequencies changing along with bearing stiffness.Then, it analyzed steady stateresponse characteristics of the rotor while applying grinding force.According to the nodedisplacements of danger interface ,stability of spindle system is ensured initially.Key words: supporting system of electromagnet bearing;grinder electric spindle;mode analysis;steady state response characteristics.Introduction

Electromagnetic bearings with no friction, wear yuan, high-speed, high precision and long-term maintenance-free, etc., it is widely used in high-speed rotating machinery.The electromagnetic bearing grinder electric spindle is a typical mechatronic systems, due to the complexity of the grinding process, the supporting spindle system compared with other bearing more prominent [1 knife.The dynamic characteristics of the rotor the electromagnetic bearing characteristics and rotor structure dynamics combined result.Before control of the rotor embodiment, the study rotor dynamic behavior of the control system design is very important.An electromagnetic bearing grinder electric spindle rotor elastic support model, its modal analysis and steady-state response characteristics in the grinding force is applied.Shaft, wheel connecting rod, front and rear radial journal cover, front and rear stabilizer ring, thrust plate, and every other magnetic interference connection between the other components and the shaft.The rotor total weight of 5.90kg, Total length 507mm, stable suspension of the rotor and the radial bearing gap of 0.2mm, and the axial bearingwheel sensor 3.Former auxiliary bearing front radial bearing 5.Shaft axial bearing cooling water jacket motor section 9 after radial bearing 10 after the auxiliary bearing clearance of 0.3 mm.Finite element model

The electromagnetic bearing the typical elastic support, finite element analysis model with 16 spring element to simulate the radial magnetic bearing 16 pole.On both sides of the thrust plate 8 spring pivot

Established with ANSYS based on the structure of the rotor, the rotor solid finite element analysis model, Modal Analysis Support stiffness IMPACT natural frequency

of the rotor based on the finite element analysis model of the rotor, modal analysis using ANSYS its [5J.The damping of the spring element is ignored, the the support stiffness 5X106 ~ lXI09N / m range order modal rotor is precession natural frequencies and negative precession natural frequency, further study of the critical speed, the first natural frequency [excluding the negative precession 6J.Can get the shaft first four natural frequency of the curve with the change in stiffness of the rotor is precession natural frequency with the support stiffness increases, and the rate of increase of the low-order natural frequency of the rotor with the bearing stiffness.The 2-4 order natural frequency of the rotor Found when the supporting stiffness increases to 1.6X10 8 N / m,Modal analysis after grinding exciting force is applied at the wheel at the harmonic response analysis, the Y direction of the force applied to the wheel outer node 7746(88 328N real part, imaginary part 1 9737N), and Z directions force(the real part of 9737N, the imaginary part of the 88 328N), so that the grinding force of a simple harmonic force.COMBIN14 element stiffness take 2.0x10 7 N / m for the analysis of the response of the rotor at high frequencies, the frequency range of the excitationforce is expanded to 0 to 1600Hz, 20 load step harmonic response analysis.Spindle 30000r / min(corresponding to the nominal operating frequency 500.0Hz), of 48 OOOr / min(corresponding to the maximum operating frequency of 800 OHZ)that speed in the first-order and second-order critical speed, the second rotor vibration type(Figure 5)can be seen, the rotor wheel, the front protective bearings, the radial bearing and the rear radial bearing at the center of a sectional view of the dangerous section.Figures 7 to 10 respectively for the wheel, the front protective bearings, the front radial bearing and a radial bearing at a frequency response of the vibration amplitude of the vibration amplitude of the radial bearing at the node 4484 frequency response curve shift increased amplitude in a The natural frequencies at the minimum, followed by the natural frequency of the second-order, third-order natural frequency.Of Grinder Spindle structure parameters are as follows: rotor protection before and after bearing clearance O.lmm the front and rear radial bearing clearance of 0.2 mm.Seen from Table 3, when the frequency of the excitation force to the rotor-order, third-order natural frequency, the resonance generated by the rotor displacement in the transfer curve in the finite element model, respectively corresponding to the nodes 7746, 7818, 7559 and 4484, the amplitude of vibration frequency response.The nodes in the Y direction of the dangerous section of the displacement shown in Table 3.When the frequency of the excitation force is reached when the natural frequency of the rotor, the rotor displacement(vibration amplitude)will suddenly increases, frequency response curve of the web through the first three can be seen, within the scope of the clearance of the rotor charts;but reached rotor Second Order natural frequency of the rotor of the resonance displacement will exceed the spacing requirements, so that the rotor and the bearing collision danger, the second natural frequency of the exciting force the frequency of the rotor should therefore be avoided.By the second-order vibration of the rotor can be seen, the radial displacement of the rotor after protection of the radial displacement of the bearing

is less than the radial bearing at the displacement of the bearings in the Y direction, it can be determined after protection Smaller

2.0 X 10 a m.Of the dangerous section of the nodal displacements gap preliminary determination rotor at rated speed and maximum

Speed work when applied to its Fn = 88.328N FT = 9737N grinding force can work stably.Conclusions

(1)fully resilient support, the overall trend of the natural frequency of the electro-spindle rotor with bearing stiffness increases, and the supporting rigidity is low, the larger the change of the natural frequency with the support stiffness.When the supporting rigidity reaches a certain value, the first four natural frequencies of the rotor is stabilized in the design of the control system can control the stiffness of the bearing is higher than this value, the stability of the critical speed for the rotor having.(2)In the grinding exciting force is applied by the amplitude frequency response analysis identified several risk interface nodal displacements can determine the initial stability of the spindle system.

第四篇：大学英语口语情景对话

自我介绍

My name is ________.I’m 20 years old.My major is ______________.In my spare time, I like to read novels.Sometimes I surf the Internet and download the E-books to read.In addition to reading, I also like watch English movies from which I learned a lot of daily life English and saw a lot of different things.Watching English movies and listen English songs also enlarges my vocabulary words and improve my pronunciation.My maxim is: To live is to learn;to learn is to better live.2.Exchange information with your partner on your favorite sports, teams and players.A：Hi, Hu.How are things with you?

B: I’m just taking one day at a time.A: How come you look so tired?

B: Because I stayed up to watch Football game on air these nights.A: Football game? You really had strong football aspirations!

B: yeah!I ’m so exciting to talk about football.I like Messi for a long time ,and I also like Barcelona Team

A: Recently.The Barcelona Team has aroused much public concern around us.Are there any good words about the team?

B: Of course!The Barcelona Team won the European Champion and their performance was as good as we might except.A: What about Messi ,the person who catches people’s eyes in any situation?

B: Yes, He did well, and he made the second goal.That was a great goal!Which player do you like?

A: I prefer basketball than football, my favorite player is Kobe, who comes from L.A Lakers.B: I heard that the team didn’t do well in the NBA playoff.A: It’s sad to say that , though they have won 16 times of champion, they still stuck on Quarterfinal.B:What a pity.What about Kobe’s performance in the NBA match?

A: Kobe is a brilliant and energetic player.He made every effort to save the situation, but it’s all in vain

B: Don’t be sad ,I believe they will rise from the ashes oneday.A: I believe too, it’s really enjoying our talk.However I really have to go now

B: Well, it’s too bad that you have to go.A: Perhaps we can get together another time

B: Ok, bye!

A: Bye!

5.Exchange information with a classmate on your favorite pop star.A: Hey liu, good morning.B: Hey hu good morning!How about your weekend?

A: It’s wonderful!I attend Madonna’s concert.B: Really? I watched the advertisement on TV few weeks ago.How do you like the concert? A: I thought it was great!Madonna is my favorite pop star, her costumes ['kɔstju:m 服装] are so unique and she performs with so much energy.B: What about her songs?

A: They’re so upbeat and easy to dance to, but I can’t understand what she sings.B: That’s funny, neither can I.A: So who is your favorite star?

B: my favorite pop star is wanglihong.you can call him leehom.A: I appreciate him too, he is very brilliant.B:Yeah, Wang grew up in the United States.Blessed with a mix of brains and talent, he spent his youth performing in local musicals, then pursued a degree in music at Williams College, followed by a masters degree from the prestigious Berkley School of MusicA: You know much about him.B: In addition to writing and producing his own music, Wang has also dabbled in movie projects around Asia.A: That’s cool.Did you see his concert ever?

B:No , how I wish I can attend his concert.A: Wish your dream would come ture!

B:Thaks, oh it’s time for class!See you after school.A: See you!

6.Exchange ideas with your partner about a course or teacher you like best in college

7.Exchange ideas with your partner about ways to make college life more rewarding

A: How are things with you?

B: I’m just taking one day at a time。

A: How come you look so tired?

B: Because my roommate stayed out to play computer games, I can’t sleep with that noise.A: That’s a common sense.At college a growing number of students, apparently don’t know the way which makes our college life more rewarding.B: That’s sounds reasonable.That’s why many students addict themselves to

computer games.And what’s your opinion about making college life more rewarding? A: From my viewpoint, we are supposed to make a plan to broaden our horizons and explore our intelligence.So that we can enrich ourselves and have a substantial life.B: Make a plan? That’s a good idea.Can you explain the precise details about what we can plan?

A: About daily study, we can make a clear plan and then achieve this goal step by step.Outside school, we can do some volunteer works to rich our college life.Meanwhile the university campus has excellent exercise and recreation facilities, we can make full use of them.What’s your opinion?

B: In my opinion, there are many way from which we can obtain much information and knowledge.For example, we can watch some classic movies, so that we are able to practice our pronunciation.Also we can listen some music to relax ourselves.A: I agree.Oh, it’s late ,I really enjoy our talk, but I need to go now.B: It’s too sad that you have to go, hope we can get together next time.A: Ok, bye!

B: Bye!

9.Exchange ideas with your partner about what kind of life your want in the future.A: Hi, hu.What are you doing here?

B: Hi liu, I am looking for some books about English.A: English? I never know that you have such a strong passion for English.B: I have an examination of college English test band six, so I need to work hard.A: I see, so are you going to take a postgraduate exam in the future?

B: Yes, I want to take up __________after graduate.But I was wondering whether I can make it.This has been a hard course for me.A: Come on, this is just what you are cut out for!You always at the top of our class, you’re pretty good, trust yourself!

B: That’s very nice for you to say so.What about you? Work? Study abroad or test the graduate student?

A: Maybe I’ll choose to work.B: That’s great, but why don’t you choose to be a postgraduate?

A: Because I don’t think I have a English studying brain, but you know that, English is the major course in the postgraduate examination.I can’t handle it.B: You’re right!English has been a puzzle for many students.However, choose to work will be a good choice.So what kind of work will you engaged in?

A: I want set up a computer company by myself, do my own business.B: That’s cool!I can’t wait to visit your company.A: I’ll inform you once I start business.B: That’s a deal, oh, it’s late, and my girlfriend is waiting for me.I need to go now.A: Ok, see you next time,B: see you!

第五篇：秘书工作情景对话

2.接听电话

秘书：您好！这里兴和文化传媒有限公司人事部办公室，请问您贵姓？

客户：我是某某的经理，怎么现在才接电话，是不是不想谈合同的事啦？（语气非常苛刻）

秘书：对不起，让您久等了，刚才公司处理的正是这件事。客户：哦，这样啊。

秘书：实在不好意思！非常抱歉！请问还有什么可以为您服务的吗？

客户：那麻烦你转告张经理，今天下午三点某某某见。秘书：今天下午某某某地，好！我一定及时转达。客户：再见！秘书：再见 3.签收信件

快递员：您好，请问你们经理在吗？有他的信件需要他来签收。

秘书：我们经理现在有事出去了现在不在，我是他的秘书，我来帮他签收吧。快递员：好的，请在这里签上你的名字。。

秘书：好了，签好了，辛苦你了！4.日程安排

经理： 高叶，昨天开会的内容整理出来，发给我看一下。

高叶： 王总，昨天的会议内容我已经发到你的E-mail上了

经理： 嗯，办事效率大大提高啊！值得夸奖 高叶： 这是我应该做的。

经理： 好，你明天去帮我定两张下个星期去北京的飞机票，具体时间你根据我的行程安排吧！

高叶： 好的，你下周一至周三没有行程安排 经理： 行，就这几天吧！

高叶： 好的！5.突发事件处理

经理正在办公室工作，突然断电，打电话给秘书询问： 经理：高叶，怎么回事，怎么突然断电了。

秘书：哦，不好意思经理，我马上打电话给后勤工作人员打电话。。

秘书：喂，你好，是后勤工作人员吗？请问现在怎么突然停电了？ 工作人员：哦，是这样的，由于维修工作的需要暂时停电几分钟。秘书：嗯，好的，你们抓紧时间维修吧，经理那边还有客人在。工作人员：嗯，我们会抓紧时间的。

接待来宾

今天有位重要客人来访。秘书要在办公室外迎接客人并进行自我介绍，然后引导他们上楼，进入经理办公室。演示整个过程。

B：你好，我是经理的秘书，我叫高叶。A：你好。

B：欢迎来到本公司，你们一路上辛苦了。A：不会不会。

B：经理现在在楼上处理一些急事，不能亲自下来迎接，所以派我下来迎接，他为不能亲自迎接您感到万分抱歉。

A：不碍事的，有急事当然是要先处理急事的。B：吴女士，谢谢您的体谅，那请您这边请。A：好的。

7.人事沟通协调

高叶：王润，今天下午公司有个重要会议要开，你去通知一下胡颖让她早点过来做下会议准备。

王润：嗯，好的，那会议具体时间是？ 高叶：下午三点，在会议厅，麻烦你了。王润：没关系的，还有其他事吗？

高叶：没有了。就这样，那下午见，拜拜！王润：拜拜！