Improving the Performance of the Diesel Test by Applying the
Computer Monitoring System
The central function of diesel test-bed is testing the locomotive diesel before checking and accepting. At present, there are lots of problems in many testing systems of the national diesel test-bed, such as low precision, high working intensity, low product efficiency and resource wasting. It has restricted the improvement of testing techniques and repairing level, so it is important to rebuild the diesel test-bed.
1. A diesel engine test station of computer monitoring system should achieve the following functions:
Diesel engine test station computer monitoring system to be followed in the principles of transforming:Diesel Engine Test in strict accordance with the outline of requirements: Commitments to be measured by parameters of the whole monitoring; strictly controlled, time control, the scope of control, assurance test by order.
Diesel bench test conducted in three stages: breaking-in period, examine and adjust the phase and acceptance stage. As diesel engine conditions in various provisions of the continuing test of time is required, therefore, in accordance with the diesel engine test systems in addition to the outline of the requirements of the above-mentioned parameters of engine monitoring of the entire process, in order to facilitate operations personnel to operate the diesel engine tips should be provided in all test conditions should be duration.
To ensure the safety of diesel engine test, the process of the trial process must be in strict accordance with the order of trial, if not completed before a trial can not be entered under a pilot.
As the diesel engine parameters to be monitored more, the display of these parameters can not be completed in the middle of a screen. Therefore, in order to facilitate the display, but also facilitate operations personnel to observe, monitor project design should be in accordance with the importance and the signal type, the monitoring data to the signal-screen display.
Diesel engine test station computer monitoring system should be modified to achieve:Diesel →analog signal parameters →digital signal →parameters →data records →data storage →data sharing (networking) process to operate inter-linkages between convenience and machinery, a response function should have
the printing function; take into account the security of the system, but also with anti-virus, human factors such as damage the function of the system. Additionally, the ultimate aim is to diesel engine parameters in a row on a computer, monitoring the entire process of realization, therefore, the whole process will be diesel engine parameters of the system shows that the main function. In order to achieve multi-sectoral regulation, diesel engine test station computer monitoring system should also be extended data sharing (networking) capabilities.
Achieve functional Diesel Engine Fault Diagnosis: In the diesel engine test process, the failure is inevitable. Some of these failures are dominant, and some are hidden in some danger of smaller, some are devastating. Therefore, the fault can be found in time for staff to promptly eliminate, it is diesel engine test station computer monitoring system to achieve a functional, but also a major feature of the system.
2. The functional realization of the following:
System theory and structure:
In order to achieve diesel engine test station computer monitoring the function of the system, the principles of systems are as follows:
Diesel engine test in accordance with the outline of requirements, the test engine in the process parameters to monitor the speed, engine power, all kinds of pressure, temperature and fuel consumption of various rates. In these parameters, speed, pressure, temperature, can be measured directly, but power, fuel consumption rate can not be measured directly out only by measuring other parameters to be calculated. In the diesel engine test stand computer monitoring system, the diesel engine power parameter is the main generator by measuring the current, voltage then calculated, and the rate of fuel consumption is diesel fuel by measuring Jin, a fuel oil mains power flow calculation, and then after be.
First to be monitored by the diesel engine parameters is signal converters. There are two methods of conversion: One is the use of sensors and other means to the engine speed, pressure, temperature, fuel flow, and other parameters to transform analog signals; another diesel engine is the main generator voltage signal leads directly or through diversion Diesel generators will be for the current signal extraction.
In order to test the entire process can be recorded, but also part of parameters can be calculated by computer, therefore, the system will be converted after the digital signal through computer interface (the instrument comes with the computer interface)
transmitted to computer systems, system management procedure to read through the data conversion to digital, histogram and curves show three ways to that of the diesel engine parameters; microcomputer system also monitoring the data to the database in the form of preservation, in order to test and After the test pilot of the previous process for the visit.
As diesel engine test stand and operation of the machinery is one of isolation, and mechanical operation of the link is very inconvenient. Therefore, the system in the mechanical installation of the LED dot matrix screen, adopted by the operator of LED dot matrix screen with the machinery to carry out inter-linked.
The host system used is industrial PC. In order to prevent virus infections and system damage caused by misuse, in the industrial system has been installed PC-reduction drive cards, when every system startup system back to the initial state, the system is more secure, even if the non-normal shutdown, will not cause the collapse of the Windows system.
3. Diesel engine test station computer monitoring system upgrades outlook
With the computer system in the locomotive on the application of computer systems used to monitor the locomotive failure has become increasingly likely. If from the major terms, the railway network monitoring system is not a dream. Then, the diesel engine test station computer monitoring system upgrading, on the one hand to achieve diesel engine test station computer monitoring system of networking, fault diagnosis and on the other hand will be used to alarm system on the locomotive, which is diesel engine test station computer monitoring system upgrade in the direction .
(1). Achieving locomotive fault diagnosis system
We have diesel engine test stations to achieve fault diagnosis and alarm systems, and if the system applied matured, it would be the system used in locomotive on a breeze. However, there are some problems here: The first is the installation of sensors. As in the diesel engine test stations with adequate space, wiring and plumbing installed very easily. But in the locomotive it has become a problem because the locomotive on the narrow space, but also the aesthetic cabling, which is a big problem. Second, the existing data collection system fault diagnosis problem.
(2). The idea of networking
With the rapid development of computer technology, computer network technology has become an important aspect of the network and the emergence of the
consequences of the high degree of information sharing. For a business, if all the data through the network can share information, not only to improve their information fast and accurate transmission, but also enable staff to make the correct judgment.
After transformation, the diesel engine test station computer monitoring system is used in the form of stand-alone, all the data are stored in the test stand control computer, and if you want to transfer data, it is necessary to print out the data in writing the form of transmission, although that is enhanced by computer monitoring data to monitor the rapid and accurate, but the sharing of data is still primitive, but it is impossible for data transmission of all test data, then the test in the state and testing the quality of judgment will inevitably deviate from. Diesel Engine Test System for automated control of the application is limited to experimental station itself, all the data can be shared on the network, the information island phenomenon.
Address information island phenomenon, the high degree of data sharing, the only way is networking, data will be posted on the Internet, and to achieve interconnection, the diesel engine test station computer monitoring system into a network-based system, we need to do more the modifications:
Accept the hardware for data lines do not need to do anything in the form of amendments, because regardless of the network database or single database, data must be accepted and consistent.
In terms of software, more areas need to be amended. Firstly, it should modify the database. According to the current network database engine test stand and the size of data should be used SQL SERVER2000 database, the database is not to abandon the re-establishment of a database, and then DELPHI BDE into the data in the database to the new database in SQL SERVER2000 to, and the introduction of work with SQL SERVER2000 into tools also provide the realization must be developed into a procedure.
After the revised database, it is necessary to modify the database connectivity. The existing database connection use the ODBC data connectivity, ODBC data networking needs can not be achieved, the whole of connections to change, now is relatively good connections ADO connection with ADO connection string will be connected to the database and procedures together , and then all the procedures in connection must be changed ADO connection.
To achieve data sharing, not only will the database into a network database can be, we must also carry out the development of the client. In the client development,
we should achieve the following functions:
First, all data through the client program can access to, and the second is in the field of data can be timely to reflect any client. For the first functional terms, all the data sharing through the client query procedures can be very easy to achieve. However, the field data reflect problems, except in the test stand directly receive data from the computer, all the client data from the database, that is, the test rig Industrial Computer accept test data, the data stored in the database, and then all client data will be removed from the database showed. Well, Industrial Computer accept data, the data required to accept a very small time interval, the smaller the time, the accuracy of the data on higher. Client data show that also involved a timely manner to the speed of network transmission, the transmission of data on the consumption of the network is sometimes staggering. In an ideal state, the delay is data can be ignored. Real-time data requirements of the situation is not very high, the data also can tolerate the delay. Usually, 100M network, the data received from the delayed delivery until the show may reach 2-3 seconds.
After these changes will be stand-alone forms of data into a network to share information, staff or diesel engine test stand is more concerned about the staff, as long as the client program installed, we can go to the monitoring and analysis of data, achieve a high degree of data sharing.
民俗文艺节目翻译 一、民俗表演《龙狮舞》 Dragon and Lion Dance 表演单位：元潭乡“女子龙狮舞”传习所 Performed by: “Female Dragon and Lion Dance Institute” of Yuantan township 龙、狮——是中华民族文化图腾，“舞龙、耍狮”以最具东方民族文化特色跻身世界民族文化瑰宝。在我们巴山人的生活中，每逢重大节庆，人们都会舞龙、舞狮，表达喜悦的心情和美好的愿望。 Dragon and lion——the totem of the Chinese national culture. The most oriental ethnic Dragon Dance and Lion Dance are the gems of the world culcure.In our life in Bashan Mountain,people joyfully play Dragon and Lion Dance to express their happiness and good wishes especially on important festivals. 二、民俗表演《巴山出嫁》 Bashan Marriage 表演单位：光雾山文艺中心 Performed by: GuangWu Mountain Literature and Arts Center. 大巴山的传统婚礼习俗中的对歌、抬花轿、拜堂、成亲等场景，有游戏、表演、逗趣等，展现出大巴山人对美好生活的向往和对婚姻家庭的美好祝愿。 Traditional Bashan Weddings are always filled with interesting scenes：Antiphonal，Sedan chair lift，the Bows and so on.Games and funny performances at the wedding are aspirations for happy marriage and better life.
附录 科技译文： Numerical Control Numerical Control(NC) is a method of controlling the movements of machineComponents by directly inserting coded instructions in the form of numerical data(numbers and data ) into the system.The system automatically interprets these data and converts to output signals. These signals ,in turn control various machine components ,such as turning spindles on and off ,changing tools,moving the work piece or the tools along specific paths,and turning cutting fluits on and off. In order to appreciate the importer of numerical control of machines ,let’s briefly review how a process such as machining has been carried out traditionally .After studying the working drawing of a part, the operator sets up the appropriate process parameters(such as cutting speed ,feed,depth of cut,cutting fluid ,and so on),determines the sequence of operations to be performed,clamps the work piece in a workholding device such as chuck or collet ,and proceeds to make the part .Depending on part shape and the dimensional accuracy specified ,this approach usually requires skilled
节目及节目种类名称 (英文)
节目名称（英文） 今日说法Legal Report 道德观察Ethical Review 新闻调查News Probe 实话实说Tell it like it is 共同关注Eyes on 大家Great Masters 科技博览Science Review 科技苑Science and Technology 走近科学 Approaching Science 全球资讯榜Newslist 文化访谈录Culture Interview 探索发现Exploring 新闻30分 News 30 Min 百家讲坛Lecture Room 挑战主持人Challenge Anchor 名将之约Winner’s Circle 让世界了解你Meet China 中国电影报道China Movie Repor(拼写错误) 今日影视Movie Today 世界电影之旅World Film Report
世界影视博览World Cinema 影视同期声Movie & TV Express 周日影院Sunday Movie Zone 佳片有约 the Best 天天饮食I can cook so do you 搜寻天下Exploring High & Low 乡村大世界the World of Country 子午书简Diary Read Speedy Digest 当代工人contemporary labourer 讲述Story 人物People 影响100 Influence 100 健康之路Meet on the Road of Health 焦点访谈 Topics in Focus 新闻调查 News Probe 新闻30分 News in 30 Minutes 东方时空 Oriental Horizon 社会经纬 Net of Justice 夕阳红 Sunset Glow 商业电视 Business TV 市场热线 Market Hotline 世界经济报道 World Economic Report
当今时代是一个自动化时代，交通灯控制等很多行业的设备都与计算机密切相关。因此，一个好的交通灯控制系统，将给道路拥挤、违章控制等方面给予技术革新。随着大规模集成电路及计算机技术的迅速发展，以及人工智能在控制技术方面的广泛运用，智能设备有了很大的发展，是现代科技发展的主流方向。本文介绍了一个智能交通灯系统的设计。该智能交通灯控制系统可以实现的功能有：对某市区的四个主要交通路口进行监控；各路口有固定的工作周期，并且在道路拥挤时中控中心能改变其周期；对路口违章的机动车能够即时拍照，并提取车牌号。在世界范围内，一个以微电子技术，计算机和通信技术为先导的，以信息技术和信息产业为中心的信息革命方兴未艾。而计算机技术怎样与实际应用更有效的结合并有效的发挥其作用是科学界最热门的话题，也是当今计算机应用中空前活跃的领域。本文主要从单片机的应用上来实现十字路口交通灯智能化的管理，用以控制过往车辆的正常运作。 The times is a automation times nowadays , traffic light waits for much the industry
equipment to go hand in hand with the computer under the control of. Therefore, a good traffic light controls system , will give road aspect such as being crowded , controlling against rules to give a technical improvement. With the fact that the large-scale integrated circuit and the computer art promptness develop, as well as artificial intelligence broad in the field of control technique applies, intelligence equipment has had very big development , the main current being that modern science and technology develops direction. The main body of a book is designed having introduced a intelligence traffic light systematically. The function being intelligence traffic light navar's turn to be able to come true has: The crossing carries out supervisory control on four main traffic of some downtown area; Every crossing has the fixed duty period , charges centre for being able to change it's period and in depending on a road when being crowded; The motor vehicle breaking rules and regulations to the crossing is able to take a photo immediately , abstracts and the vehicle shop sign. Within world range, one uses the microelectronics technology , the computer and the technology communicating by letter are a guide's , centering on IT and IT industry information revolution is in the ascendant. But, how, computer art applies more effective union and there is an effect's brought it's effect into play with reality is the most popular topic of conversation of scientific community , is also that computer applications is hit by the unparalleled active field nowadays. The main body of a book is applied up mainly from slicing machine's only realizing intellectualized administration of crossroads traffic light , use opera tion in controlling the vehicular traffic regularity.
附录 INTEGRATION OF MACHINERY （From ELECTRICAL AND MACHINERY INDUSTRY）ABSTRACT Machinery was the modern science and technology development inevitable result, this article has summarized the integration of machinery technology basic outline and the development background .Summarized the domestic and foreign integration of machinery technology present situation, has analyzed the integration of machinery technology trend of development. Key word：integration of machinery ，technology，present situation ，product t，echnique of manufacture ，trend of development 0. Introduction modern science and technology unceasing development, impelled different discipline intersecting enormously with the seepage, has caused the project domain technological revolution and the transformation .In mechanical engineering domain, because the microelectronic technology and the computer technology rapid development and forms to the mechanical industry seepage the integration of machinery, caused the mechanical industry the technical structure, the product organization, the function and the constitution, the production method and the management system has had the huge change, caused the industrial production to enter into “the integration of machinery” by “the machinery electrification” for the characteristic development phase. 1. Integration of machinery outline integration of machinery is refers in the organization new owner function, the power function, in the information processing function and the control function introduces the electronic technology, unifies the system the mechanism and the computerization design and the software which constitutes always to call. The integration of machinery development also has become one to have until now own system new discipline, not only develops along with the science and technology, but also entrusts with the new content .But its basic characteristic may summarize is: The integration of machinery is embarks from the system viewpoint, synthesis community technologies and so on utilization mechanical technology, microelectronic technology, automatic control technology,
英语阅读理解带翻译：电视节目 Television gives the American people a wide variety of programs from early morning until late at night. Operas, orchestral performances, chamber music and jazz concerts are often presented on television. So most of the leisure at home is used for watching television. Many Americans are so fond of their TV programs that they often have cold luncheon in front of their receiving sets. Television has given people newer and deeper understanding of history, art, music, literature, the ballet, the theater, the discoveries of modern science and the wonders of the universe. Television viewers pay no tax or charges for receiving programs on their sets. The cost of the programs is paid chiefly by those who are given the opportunity to advertise their goods or services during the commercial breaks. 美国人从清晨直到深夜都能看到形形色色的电视节目。电视屏幕 上经常播放歌剧、管弦乐、室内音乐和爵士音乐演奏。所以家庭中绝 大部分空闲时间都花在看电视上。很多美国人酷爱电视节目，经常在 电视机前边看电视边吃冷餐。电视使人们对历史、艺术、音乐、文学、舞剧、戏剧、现代科学的新发现和宇宙的奥妙有较新和较深切的了解。电视观众看电视节目既不用缴税，也不必付款，节目费用主要是由那 些借此为其商品和服务做插播广告的人支付的。
英文 Because of the rapid development of our economy resulting in the car number of large and medium-sized cities surged and the urban traffic, is facing serious test, leading to the traffic problem increasingly serious, its basically are behaved as follows: traffic accident frequency, to the human life safety enormous threat, Traffic congestion, resulting in serious travel time increases, energy consumption increase; Air pollution and noise pollution degree of deepening, etc. Daily traffic jams become people commonplace and had to endure. In this context, in combination with the actual situation of urban road traffic, develop truly suitable for our own characteristics of intelligent signal control system has become the main task. Preface In practical application at home and abroad, according to the actual traffic signal control application inspection, planar independent intersection signal control basic using set cycle, much time set cycle, half induction, whole sensor etc in several ways. The former two control mode is completely based on planar intersection always traffic flow data of statistical investigation, due to traffic flow the existence of variable sex and randomicity, the two methods have traffic efficiency is low, the scheme, the defects of aging and half inductive and all the inductive the two methods are in the former two ways based on increased vehicle detector and according to the information provided to adjust cycle is long and green letter of vehicle, it than random arrived adaptability bigger, can make vehicles in the parking cord before as few parking, achieve traffic flowing effect In modern industrial production,current,voltage,temperature, pressure, and flow rate, velocity, and switch quantity are common mainly controlled parameter. For example: in metallurgical industry, chemical production, power engineering, the papermaking industry, machinery and food processing and so on many domains, people need to transport the orderly control. By single chip microcomputer to control of traffic, not only has the convenient control, configuration simple and flexible wait for an advantage, but also can greatly improve the technical index by control quantity, thus greatly improve product quality and quantity. Therefore, the monolithic integrated circuit to the traffic light control problem is an industrial production we often encounter problems. In the course of industrial production, there are many industries have lots of traffic equipment, in the current system, most of the traffic control signal is accomplished by relays, but relays response time is long, sensitivity low, long-term after use, fault opportunity increases greatly, and adopts single-chip microcomputer control, the accuracy of far greater than relays, short response time, software reliability, not because working time reduced its performance sake, compared with, this solution has the high feasibility. About AT89C51 (1)function characteristics description: AT89C51 is a low power consumption, high performance CMOS8 bit micro-controller, has the 8K in system programmable Flash memory. Use high-density Atmel company the beltpassword nonvolatile storage technology and manufacturing, and industrial 80S51 product instructions and pin fully compatible. Chip Flash allow program memory in system programmable, also suitable for conventional programmer. In a single chip, have dexterous 8 bits CPU and in system programmable Flash, make AT89C51 for many embedded control application system provides the high flexible, super efficient solution. AT89C51 has the following standard function: 8k bytes Flash, 256 bytes RAM, 32-bit I/O mouth line, the watchdog timer, two data pointer, three 16 timer/counter, a 6 vector level 2 interrupt structure, full-duplex serial port, piece inside crystals timely clock circuit. In addition, AT89C51 can drop to 0Hz static logic operation, support two software can choose power saving mode. Idle mode, the CPU to stop working, allowing the RAM, timer/counter, serial ports, interruption continue to work. Power lost protection mode, RAM content being saved, has been frozen, microcontroller all work stop, until the next interruption or hardware reset so far. As shown in
本科毕业论文(设计) 外文翻译 学院：机电工程学院 专业：机械工程及自动化 姓名：高峰 指导教师：李延胜 2011年05 月10日 教育部办公厅 Failure Analysis，Dimensional Determination And
Analysis，Applications Of Cams INTRODUCTION It is absolutely essential that a design engineer know how and why parts fail so that reliable machines that require minimum maintenance can be designed．Sometimes a failure can be serious，such as when a tire blows out on an automobile traveling at high speed．On the other hand，a failure may be no more than a nuisance．An example is the loosening of the radiator hose in an automobile cooling system．The consequence of this latter failure is usually the loss of some radiator coolant，a condition that is readily detected and corrected．The type of load a part absorbs is just as significant as the magnitude．Generally speaking，dynamic loads with direction reversals cause greater difficulty than static loads，and therefore，fatigue strength must be considered．Another concern is whether the material is ductile or brittle．For example，brittle materials are considered to be unacceptable where fatigue is involved． Many people mistakingly interpret the word failure to mean the actual breakage of a part．However，a design engineer must consider a broader understanding of what appreciable deformation occurs．A ductile material，however will deform a large amount prior to rupture．Excessive deformation，without fracture，may cause a machine to fail because the deformed part interferes with a moving second part．Therefore，a part fails(even if it has not physically broken)whenever it no longer fulfills its required function．Sometimes failure may be due to abnormal friction or vibration between two mating parts．Failure also may be due to a phenomenon called creep，which is the plastic flow of a material under load at elevated temperatures．In addition，the actual shape of a part may be responsible for failure．For example，stress concentrations due to sudden changes in contour must be taken into account．Evaluation of stress considerations is especially important when there are dynamic loads with direction reversals and the material is not very ductile． In general，the design engineer must consider all possible modes of failure，which include the following． ——Stress ——Deformation ——Wear ——Corrosion ——Vibration ——Environmental damage ——Loosening of fastening devices
栏目名和书名、文章标题一样，是画龙点睛之笔，其翻译应遵循以下原则：1.能够反映本栏目的中心内容，突出主题。2.译名必须简洁，明白易懂，朗朗上口。 3.不用句子结构，即主谓宾或主系表结构。 4.不能望文生义。如《东方时空》译为Oriental Horizon。horizon的意思是地平线,即"向水平方向望去,天与地相交接的线"，以此作为栏目名意境深远,给人想象的空间。如果译为Eastern Tim e and Space，就失去其深邃的意义了。又如社会经纬是中央电视台最早的一个法制节目，目的是向观众普及法律知识，增强观众的法律意识，弘扬司法公正。"社会经纬"字面上并没有法律，如直译成英文，会显得莫名其妙。但如果译成N et of Justice，就会使人由法律想到公正，由经纬想到天网恢恢。再如《夕阳红》译为Sunset Glow，比较贴切，又富有诗意。因为glow的意思"throw out light and heat without flame"(The Concise Oxford Dictionary of Curren t English,p.502)。下面，笔者把收集到的栏目名称英译与大家分享： 焦点访谈 Topics in Focus 新闻调查 News Probe 新闻30分 News in 30 Minutes 商业电视 Business TV 市场热线 Market Hotline 世界经济报道 World Economic Report 股市分析 Stock Market Analysis 足球之夜 Soccer Night 健康俱乐部 Health Club 春节联欢晚会 Spring Festival Gala Evening 半边天 Half the Sky 综艺大观 Super Variety Show 戏迷园地 Garden for Opera Fans 大风车 Big Pinwheel 七巧板 Tangram 12演播室 Twelve Studio 中华民族 Chinese Ethnic Peoples 科技博览 Science and Technology Review 人与自然 Man and Nature 正大综艺 Zhengda Variety Show 书坛画苑 Gallery of Calligraphy Painting 天涯共此时 Time Together across the Strait 华夏风情 China Kaleidoscope 中国新闻 China News 中国报道 China Report 旅行家 Travelogue 中国各地 Around China 今日中国 China Today 周日话题 Sunday Topics 英语新闻 English News 东方时尚 Oriental Fashion
交通信号灯 当今，红绿灯安装在各个道口上，已经成为疏导交通车辆最常见和最有效的手段。社会的发展，人们的消费水平不断的提高，私人车辆不断的增加。人多、车多道路窄的道路交通状况已经很明显了。所以采用有效的方法控制交通灯是势在必行的。PLC 的智能控制原则是控制系统的核心，采用PLC把东西方向或南北方向的车辆按数量规模进行分档，相应给定的东西方向与南北方向的绿灯时长也按一定的规律分档. 这样就可以实现按车流量规模给定绿灯时长，达到最大限度的有车放行，减少十字路口的车辆滞流，缓解交通拥挤、实现最优控制，从而提高了交通控制系统的效率. PLC的应用正在不断地走向深入，同时带动传统控制检测日新月益更新。它具有结构简单、编程方便、可靠性高等优点，已广泛用于工业过程和位置的自动控制中。由于PLC具有对使用环境适应性强的特性，同时其内部定时器资源十分丰富，可对目前普遍使用的“渐进式”信号灯进行精确控制，特别对多岔路口的控制可方便地实现。因此现在越来越多地将PLC应用于交通灯系统中。 同时，PLC本身还具有通讯联网功能，将同一条道路上的信号灯组成一局域网进行统一调度管理，可缩短车辆通行等候时间，实现科学化管理。在实时检测和自动控制的PLC应用系统中，PLC往往是作为一个核心部件来使用。 .. 21世纪，PLC会有更大的发展。从技术上看，计算机技术的新成果会更多地应用于可编程控制器的设计和制造上，会有运算速度更快、存储容量更大、智能更强的品种出现；从产品规模上看，会进一步向超小型及超大型方向发展；从产品的配套性上看，产品的品种会更丰富、规格更齐全，完美的人机界面、完备的通信设备会更好地适应各种工业控制场合的需求；从市场上看，各国各自生产多品种产品的情况会随着国际竞争的加剧而打破，会出现少数几个品牌垄断国际市场的局面，会出现国际通用的编程语言；从网络的发展情况来看，可编程控制器和其它工业控制计算机组网构成大型的控制系统是可编程控制器技术的发展方向。目前的计算机集散控制系统DCS中已有大量的可编程控制器应用。伴随着计算机网络的发展，可编程控制器作为自动化控制网络和国际通用网络的重要组成部分，将在工业及工业以外的众多领域发挥越来越大的作用。
沈阳工业大学工程学院 毕业设计（论文）外文翻译 毕业设计（论文）题目：工具盒盖注塑模具设计 外文题目：Friction , Lubrication of Bearing 译文题目：轴承的摩擦与润滑 系（部）：机械系 专业班级：机械设计制造及其自动化0801 学生姓名：王宝帅 指导教师：魏晓波 2010年10 月15 日
外文文献原文： Friction , Lubrication of Bearing In many of the problem thus far , the student has been asked to disregard or neglect friction . Actually , friction is present to some degree whenever two parts are in contact and move on each other. The term friction refers to the resistance of two or more parts to movement. Friction is harmful or valuable depending upon where it occurs. friction is necessary for fastening devices such as screws and rivets which depend upon friction to hold the fastener and the parts together. Belt drivers, brakes, and tires are additional applications where friction is necessary. The friction of moving parts in a machine is harmful because it reduces the mechanical advantage of the device. The heat produced by friction is lost energy because no work takes place. Also , greater power is required to overcome the increased friction. Heat is destructive in that it causes expansion. Expansion may cause a bearing or sliding surface to fit tighter. If a great enough pressure builds up because made from low temperature materials may melt. There are three types of friction which must be overcome in moving parts: (1)starting, (2)sliding, and(3)rolling. Starting friction is the friction between two solids that tend to resist movement. When two parts are at a state of rest, the surface irregularities of both parts tend to interlock and form a wedging action. To produce motion in these parts, the wedge-shaped peaks and valleys of the stationary surfaces must be made to slide out and over each other. The rougher the two surfaces, the greater is starting friction resulting from their movement . Since there is usually no fixed pattern between the peaks and valleys of two mating parts, the irregularities do not interlock once the parts are in motion but slide over each other. The friction of the two surfaces is known as sliding friction. As shown in figure ,starting friction is always greater than sliding friction . Rolling friction occurs when roller devces are subjected to tremendous stress which cause the parts to change shape or deform. Under these conditions, the material in front of a roller tends to pile up and forces the object to roll slightly uphill. This changing of shape , known as deformation, causes a movement of molecules. As a result ,heat is produced from the added energy required to keep the parts turning and overcome friction. The friction caused by the wedging action of surface irregularities can be overcome