飛輪專用回轉(zhuǎn)鉆模夾緊機(jī)構(gòu)設(shè)計(jì) (帶CAD圖紙),飛輪專用回轉(zhuǎn)鉆模夾緊機(jī)構(gòu)設(shè)計(jì),(帶CAD圖紙),飛輪,專用,回轉(zhuǎn),夾緊,機(jī)構(gòu),設(shè)計(jì),cad,圖紙 Introduction to Mechanical Engineering Mechanical engineering is the branch of engineering that deals with machines and the production of power. It is particularly concerned with forces and motion. History of Mechanical Engineering The invention of the steam engine in the latter part of the 18th century, providing a key source of power for the Industrial Revolution, gave an enormous impetus to the development of machinery of all types. As a result a new major classification of engineering, separate from civil engineering and dealing with tools and machines, developed, receiving formal recognition in 1847 in the founding of the Institution of Mechanical Engineers in Birmingham, England. Mechanical engineering has evolved from the practice by the mechanic of an art based largely on trial and error to the application by the professional engineer of the scientific method in research, design, and production. The demand for increased efficiency, in the widest sense, is continually raising the quality of work expected from a mechanical engineer and requiring of him a higher degree of education and training. Not only must machines run more economically but capital costs also must be minimized. Fields of Mechanical Engineering Development of machines for the production of goods The high material standard of living in the developed countries owes much to the machinery made possible by mechanical engineering. The mechanical engineer continually invents machines to produce goods and develops machine tools of increasing accuracy and complexity to build the machines. The principal lines of development of machinery have been an increase in the speed of operation to obtain high rates of production, improvement in accuracy to obtain quality and economy in the product, and minimization of operating costs. These three requirements have led to the evolution of complex control systems. The most successful production machinery is that in which the mechanical design of the machine is closely integrated with the control system, whether the latter is mechanical or electrical in nature. A modern transfer line (conveyor) for the manufacture of automobile engines is a good example of the mechanization of a complex series of manufacturing processes. Developments are in hand to automate production machinery further, using computers to store and process the vast amount of data required for manufacturing a variety of components with a small number of versatile machine tools. One aim is a completely automated machine shop for batch production, operation on a three-shift basis but attended by a staff for only one shift per day. Development of machines for the production of power Production machinery presupposes an ample supply of power. The steam engine provided the first practical means of generating power from heat to augment the old sources of power from muscle, wind, and water. One of the first challenges to the new profession of mechanical engineering was to the steam turbine and associated large steam boilers. The 20th century has witnessed a continued rapid growth in the power output of turbines for driving electric generators, together with a steady increase in thermal efficiency and reduction in capital cost per kilowatt of large power stations. Finally, mechanical engineers acquired the resource of nuclear energy, whose application has demanded an exceptional standard of reliability and safety involving the solution of entirely new problems. The control systems of large power plants and complete nuclear power stations have become highly sophisticated networks of electronic, fluidic, electric, hydraulic, and mechanical components, all of these involving the province of the mechanical engineer. The mechanical engineer is also responsible for the much smaller internal combustion engines, both reciprocating (gasoline and diesel) and rotary (gas-turbine and Wankel) engines, with their widespread transport applications. In the transportation field generally, in air and space as well as on land and sea, the mechanical engineer has created the equipment and the power plant, collaborating increasingly with the electrical engineer, especially in the development of suitable control systems. Development of military weapons The skills applied to war by the mechanical engineer are similar to those required in civilian applications, though the purpose is to enhance destructive power rather than to raise creative efficiency. The demands of war have channeled huge resources into technical fields, however, and led to developments that have profound benefits in peace. Jet aircraft and nuclear reactors are notable examples. Bioengineering Bioengineering is a reactively new and distinct field of mechanical engineering that includes the provision of machines to replace or augment the functions of the human body and of equipment for use in medical treatment. Artificial limbs have been developed incorporating such lifelike functions as powered motion and touch feedback.. Development is rapid in the direction of artificial spare-part surgery. Sophisticated heart-lung machines and similar equipment permit operations of increasing complexity and permit the vital functions in seriously injured or diseased patients to be maintained. Environmental control Some of the earliest efforts of mechanical engineers were aimed at controlling man’s environment by pumping water to drain or irrigate land and by ventilating mines. The ubiquitous refrigerating and air-condition plants of the modern age are based on a reversed heat engine, where the supply of power “pumps” heat from the cold region to the warmer exterior. Many of the products of mechanical engineering, together with technological developments in other fields, have side effects on the environment and give rise to noise, the pollution of water and air, and the dereliction of land and scenery. The rate of production, both of goods and power, is rising so rapidly that regeneration by natural forces can no longer keep pace. A rapidly growing field for mechanical and other is environmental control, comprising the development of machines and processed that will produce fewer pollutants and of new equipment and techniques that can reduce or remove the pollution already generated. Functions of Mechanical Engineering Four functions of the mechanical engineering, common to all the fields mentioned, be cited. The first is the understanding of and dealing with the bases of mechanical science. These include dynamics, concerning the relation between forces and motion, such as in vibration; automatic control; thermodynamics, dealing with the relations among the various forms of heat, energy, and power; fluid flow; heat transfer; lubrication; and properties of materials. Second is the sequence of research, design, and development. This function attempts to bring about the changes necessary to meet present and future needs. Such work requires not only a clear understanding of mechanical science and an ability to analyze a complex system into its basic factors, but also the originality to synthesize and invent. Third is production of products and power, which embraces planning, operation, and maintenance. The goal is to produce the maximum value with the minimum investment and cost while maintaining or enhancing longer term viability and reputation of the enterprise or the institution. Fourth is the coordinating functions of the mechanical engineering, including management, consulting, and, in some cases, marketing. In all of these functions there is a long continuing trend toward the use of scientific instead of traditional or intuitive methods, an aspect of the ever-growing professionalism of mechanical engineering. Operations research, value engineering, and PABLA (problem analysis by logical approach) are typical titles of such new rationalized approaches. Creativity, however, cannot be rationalized. The ability to take the important and unexpected step that opens up new solutions remains in mechanical engineering, as elsewhere, largely a personal and spontaneous characteristic. The Future of Mechanical Engineering The number of mechanical engineers continues to grow as rapidly as ever, while the duration and quality of their training increases. There is a growing awareness, however, among engineers and in the community at large that the exponential increase in population and living standards is raising formidable problems in pollution of the environment and the exhaustion of natural resources; this clearly heightens the need for all of the technical professions to consider the long-term social effects of discoveries and developments. There will be an increasing demand for mechanical engineering skills to provide for man’s needs while reducing to a minimum the consumption of scarce raw materials and maintaining a satisfactory environment. Mechanical engineering in the information age In the early 1980s, engineers thought that massive would be needed to speedup product development. As it turn out ,less research is actually needed because shortened product development cycles encourage engineers to sue available technology .developing a revolutionary for use in a new product is risky and prone to failure. Taking short steps is a safer and usually more successful to product development. Shorter product development cycles are also beneficial in engineering world in which both capital and labor are global. People who can design and manufacture various products can be found anywhere in the world, but containing a new idea is hard. Geographic distance is no longer a barrier to others finding out about your development six months into the process. If you’ve got a short development cycle, the situation is not catastrophic as long as you maintain your lead. But if you’re in the midst of a six-year development process and a competitor gets wind of your work, the project could be in more serious trouble. The idea that engineers need to create a new design to solve every problem is quickly becoming obsolete. The first step in the modern design process is to browse the Internet or other information systems to see if someone else has already designed a transmission, or a heat exchanger than is close to what you need. Through these information systems, you may discover that someone already has manufacturing drawing, numerical control tapes, and every else required to manufacture your product. Engineer can then focus their professional competence unsolved problems. In tackling such problem, the availability of workstations and access to the information highway dramatically enhance the capability of the engineering team and its productivity. These information age tools can give the team access to massive databases of material properties, standards, technologies, and successful design. Such protested designs can be downloaded for direct use or quickly modified to meet specific needs. Remote manufacturing, in which product instructions are sent out over a network, is also possible. You could end up with a virtual company where you don’t have to see any hardware. When the product is completed, you can direct the manufacturer to drop-ship it to your customer. Periodic visit to the customer can be made to ensure that the product you designed is working according to the specifications. Although all of these developments won’t apply equally to every company, the potential is there. Custom design used to be left to small companies. Big companies sneered at it they hated the idea of dealing with niche markets or small-volume custom solutions. “Here is my product,” one of big companies would say “This is best we make it you ought to like it .If you don’t, there’s a smaller company down the street that will work on your problem.” Today, nearly every market is a niche market, because customers are selective. If you ignore the potential for tailoring your product to specific customers’ needs, you will lose the major part of your market share perhaps all of it. Since these niche markets are transient, you company need to be in a position to respond to them quickly .The emergence of niche markets and design on demand has altered the way engineers conduct research. Today, research is commonly directed toward solving particular problem. Although this situation is probably temporary, much uncommitted technology, developed at government expense or written off by major corporations, is available today at every low cost .Following modest modification, such technology can often be used directly in product development, which allows many organizations to avoid the expense of an extensive research effort. Once the technology is free or major obstacles, the research effort can focus on overcoming the barriers to commercialization rather than on pursuing new and interesting, but undefined, alternatives. When viewed in this perspective, engineering research must focus primarily on removing the barriers to rapid commercialization of known technologies. Much of this effort must address quality and reliability concerns. Which are foremost in the mind of today’s consume. Clearly, a reputation for poor quality is synonymous with bad business. Everything possible including through inspection at the end of the manufacturing line and automatic replacement of defective products---must be done to assure that the customer receives a properly functioning product. Research has to focus on the cost benefit of factors such as reliability. As reliability increase, manufacturing costs and the system will decrease. Having 30 percent junk at the end of a production line not only costs a fortune but also create an opportunity for a competitor to take your idea and sell it to your customers. Central to the process of improving reliability and lowering costs is intensive and widespread use of design software, which allows engineers to speed up every stage of the design process. Shortening each stage, however, may not sufficiently reduce the time required for entire process. Therefore, attention must also be devoted to concurrent engineering software with shared databases that can be accessed by all members of the design team. As we move more fully into the Information Age, success will require that the engineer possess some unique known of and experience in both the development and the management of technology .Success will required broad knowledge and skills as well as expertise in some key technologies and disciplines; it will also require a keen awareness of the social and economic factor at work in the marketplace. Increasingly , in the future routine problem will not justify heavy engineering expenditures, and engineers will be expected to work cooperatively in solving more challenging, more demanding problem in substantially less time .We have begun a new phase in the practice of engineering . It offers great promise and excitement as more and more problem—solving capability is placed in the hands of the computerized and wired engineers .To assure success , the capability of our tools and the unquenched thirst for better products and system must be matched by the joy of creation that marks all great engineering endeavors . Mechanical engineering is a great profession, and it will become even greater as we make the most of the opportunities offered by the Information Age. 機(jī)械工程簡(jiǎn)介 機(jī)械工程是工程學(xué)的一個(gè)分支，它研究機(jī)械和動(dòng)力的產(chǎn)生，尤其是力和運(yùn)動(dòng)。 機(jī)械工程的歷史 18世紀(jì)后期，蒸汽機(jī)的發(fā)明為工業(yè)革命提供了一個(gè)主要的動(dòng)力源泉，極大地推動(dòng)了各種機(jī)械的發(fā)展。這樣，一個(gè)新的工程學(xué)的重要分支——從民用工程學(xué)中分離出來(lái)的關(guān)于工具和機(jī)械的分支——發(fā)展了起來(lái)。并隨著英國(guó)伯明翰機(jī)械工程師協(xié)會(huì)的建立在1847年得到了正式承認(rèn)。 機(jī)械工程已經(jīng)由一門主要基于試錯(cuò)法的技工應(yīng)用的技藝發(fā)展成為職業(yè)工程師在研究、設(shè)計(jì)和生產(chǎn)領(lǐng)域使用的科學(xué)方法。 從最廣義的角度講，增進(jìn)效率的需求不斷地促使機(jī)械工程師提高工作質(zhì)量，并要求他接受更高程度的教育和訓(xùn)練。不僅機(jī)器運(yùn)轉(zhuǎn)要講求經(jīng)濟(jì)，而且基建費(fèi)也要降到最低。 機(jī)械工程的領(lǐng)域 商品機(jī)械的發(fā)展 在發(fā)達(dá)國(guó)家中，高水平的物質(zhì)生活很大程度上取決于機(jī)械工程中得以實(shí)現(xiàn)的各種機(jī)械。機(jī)械工程師們不斷地發(fā)明機(jī)器來(lái)生產(chǎn)商品，不斷地開(kāi)發(fā)精確性和復(fù)雜性越來(lái)越高的機(jī)械工具來(lái)生產(chǎn)機(jī)器。 機(jī)械發(fā)展的主要線索是：為提高生產(chǎn)率而增加機(jī)器的運(yùn)轉(zhuǎn)速度、為獲得物美價(jià)廉的產(chǎn)品而提高精度以及降低生產(chǎn)成本。這3個(gè)要求促進(jìn)了復(fù)雜的控制系統(tǒng)的發(fā)展。 最成功的機(jī)械制造是其機(jī)器的機(jī)械設(shè)計(jì)能與控制系統(tǒng)緊密融合，不論這種控制系統(tǒng)從本質(zhì)上是機(jī)械的還是電子的?，F(xiàn)代化的汽車發(fā)動(dòng)機(jī)生產(chǎn)傳送線（傳送帶）就是一系列復(fù)雜的生產(chǎn)工藝機(jī)械化的很好例子。人們正在著手開(kāi)發(fā)以使機(jī)械生效后進(jìn)一步自動(dòng)化，利用計(jì)算機(jī)來(lái)存儲(chǔ)和處理大量數(shù)據(jù)，這些數(shù)據(jù)是少量多功能機(jī)床生產(chǎn)多種零件所必需的。其中一個(gè)目標(biāo)就是使批量生產(chǎn)車間完全自動(dòng)化，三班輪換，但每天只需一班人員來(lái)操作。 動(dòng)力機(jī)械的發(fā)展 生產(chǎn)機(jī)械必須先有充足的動(dòng)力供應(yīng)。蒸汽機(jī)最先提供了用熱能來(lái)產(chǎn)生動(dòng)力的實(shí)際可行的方法，在舊有的人力、風(fēng)力和水力之外增加了動(dòng)力源。新的機(jī)械工程業(yè)面臨的最初挑戰(zhàn)之一就是增加熱效率和動(dòng)力，這一點(diǎn)隨著蒸汽渦輪機(jī)和大的聯(lián)合蒸汽鍋爐的發(fā)展而基本實(shí)現(xiàn)了。20世紀(jì)，渦輪機(jī)為發(fā)電機(jī)提供的動(dòng)力得到了持續(xù)快速的增長(zhǎng)，同時(shí)熱效率也在穩(wěn)定增長(zhǎng)，而且大電站每千瓦的資本消耗也在下降。最后，機(jī)械工程師們獲得了核能源。這種核能源的應(yīng)用需要有特別高的可靠性和安全性，這就需要解決許多全新的問(wèn)題。大型電廠和整個(gè)核電站的控制系統(tǒng)已變成高度復(fù)雜的電子、流體、電、水力和機(jī)械零件的網(wǎng)絡(luò)，這一切都涉及到機(jī)械工程師的所有學(xué)術(shù)領(lǐng)域。 小型的內(nèi)燃機(jī)，不論是往復(fù)式（汽油機(jī)和柴油機(jī)）還是旋轉(zhuǎn)式（燃?xì)廨啓C(jī)和旺克爾機(jī)），以及它們?cè)谶\(yùn)輸領(lǐng)域的廣泛應(yīng)用也都要?dú)w功于機(jī)械工程師們。在整個(gè)運(yùn)輸業(yè)，不論是在空中和太空，還是在陸地和海洋，機(jī)械工程師創(chuàng)造了各種設(shè)備和動(dòng)力裝置。他們?cè)絹?lái)越多地與電氣工程師合作，尤其是在開(kāi)發(fā)適合的控制系統(tǒng)方面。 軍用武器的開(kāi)發(fā) 機(jī)械工程師應(yīng)用于戰(zhàn)爭(zhēng)的技術(shù)與民用中需要的類似，盡管其目的是增強(qiáng)毀壞力而不是提高生產(chǎn)率。噴氣式飛機(jī)和核反應(yīng)堆就是眾所周知的例子。 生物工程 生物工程是機(jī)械工程中一個(gè)相對(duì)新的和與眾不同的領(lǐng)域，它提供用來(lái)替換或增加人體功能的機(jī)器以及用來(lái)進(jìn)行醫(yī)療的設(shè)備。人造肢體已被開(kāi)發(fā)出來(lái)，并且具有諸如有力的運(yùn)動(dòng)和觸摸反應(yīng)等人體功能。在人工器官移植手術(shù)方面的發(fā)展是迅速的，復(fù)雜的心肺機(jī)器和類似的設(shè)備使越來(lái)越復(fù)雜的手術(shù)得以進(jìn)行，并使受重傷和重病病人的生命功能得以持續(xù)。 環(huán)境控制 機(jī)械工程師的一些最初的努力是要通過(guò)抽水來(lái)排澇或灌溉土地以及給礦井通風(fēng)來(lái)控制人類的環(huán)境。現(xiàn)代的制冷和空調(diào)廠普遍采用反向的熱引擎，在這些地方動(dòng)力把熱從冷的地方抽出送到更熱的外部。 很多機(jī)械工程的產(chǎn)品以及其他領(lǐng)域的技術(shù)發(fā)展對(duì)環(huán)境有副作用，產(chǎn)生了噪音，引起了水和空氣的污染，破壞了土地和風(fēng)景。商品和動(dòng)力的生產(chǎn)率提高太快，以致于自然力的再生跟不上步伐。對(duì)于機(jī)械工程師和他人來(lái)說(shuō)，環(huán)境控制是一個(gè)快速發(fā)展的領(lǐng)域，它包括開(kāi)發(fā)盡可能產(chǎn)生少量污染物的機(jī)器和生產(chǎn)工序，以及開(kāi)發(fā)新的設(shè)備和技術(shù)來(lái)減少和消除已造成的污染。 機(jī)械工程的作用 機(jī)械工程師有四個(gè)通用于上述所有領(lǐng)域的作用。第1個(gè)作用是理解和研究機(jī)械科學(xué)的基礎(chǔ)。它包括涉及力和運(yùn)動(dòng)的關(guān)系的動(dòng)力學(xué)，比如在振動(dòng)中的力和運(yùn)動(dòng)的關(guān)系；自動(dòng)控制；研究各種形式的熱、能量、動(dòng)力之間關(guān)系的熱力學(xué)；流體流動(dòng)；熱傳遞；潤(rùn)滑；和材料特性。 第2個(gè)作用是依次地進(jìn)行研究、設(shè)計(jì)和開(kāi)發(fā)。該作用試圖進(jìn)行必要的改變以滿足當(dāng)前和將來(lái)的需要。這一工作不僅要求對(duì)機(jī)械科學(xué)有一個(gè)合成和發(fā)明。 第3個(gè)作用是生產(chǎn)產(chǎn)品和動(dòng)力，包括計(jì)劃、運(yùn)作和維護(hù)。其目的在于維護(hù)或提高企業(yè)或機(jī)構(gòu)的較長(zhǎng)期的和生存能力聲譽(yù)的同時(shí)，以最少的投資和消耗生產(chǎn)出最大的價(jià)值。 第4個(gè)作用是機(jī)械工程師的協(xié)調(diào)作用，包括管理、咨詢、以及在某些情況下進(jìn)行市場(chǎng)營(yíng)銷。 在所有這些作用中，體現(xiàn)出一種長(zhǎng)期不斷地使用科學(xué)的方法，而不是傳統(tǒng)的或直覺(jué)的方法的傾向，這是不斷成長(zhǎng)的機(jī)械工程專門技術(shù)的一個(gè)方面。這些新的合理化方法的典型名稱有：運(yùn)籌學(xué)、工程經(jīng)濟(jì)學(xué)、邏輯學(xué)問(wèn)題分析（簡(jiǎn)稱PABLA）。然而，創(chuàng)造性是無(wú)法合理化的。正如在其他領(lǐng)域一樣，在機(jī)械工程中，能夠采取重要的出人意料的并能開(kāi)創(chuàng)出新方法的能力，仍然具有個(gè)人的、即興的特點(diǎn)。 機(jī)械工程的未來(lái) 機(jī)械工程師的數(shù)量依舊快速增長(zhǎng)，同時(shí)他們所受訓(xùn)練的時(shí)間也在延長(zhǎng)并且質(zhì)量也在提高。然而，工程師們和全體公眾越來(lái)越意識(shí)到，人口和生活水平的指數(shù)增長(zhǎng)正在造成可怕的環(huán)境污染和自然資源消耗問(wèn)題。這更清楚地表明，所有的技術(shù)職業(yè)都有必要考慮開(kāi)發(fā)和發(fā)展的長(zhǎng)期社會(huì)效益。人們?cè)絹?lái)越需要機(jī)械工程技術(shù)來(lái)滿足人類的需求，同時(shí)也需要將稀有的原材料的消耗降到最低，保持一個(gè)令人滿意的環(huán)境。 信息時(shí)代的機(jī)械工程 在20世紀(jì)80年代初期，工程師門曾經(jīng)認(rèn)為要加快產(chǎn)品的研制看法，必須進(jìn)行大量的研究工作。結(jié)果是實(shí)際上只進(jìn)行了較少的研究工作，這是因?yàn)楫a(chǎn)品開(kāi)發(fā)周期的縮短，促使工程師們盡可能的利用現(xiàn)代技術(shù)。研制開(kāi)發(fā)一種創(chuàng)新性的技術(shù)并且將其應(yīng)用在新產(chǎn)品上，使有風(fēng)險(xiǎn)的，并且易于招致失敗。在產(chǎn)品開(kāi)發(fā)過(guò)程中采用較少的步驟是安全的和易于成功的方法。 對(duì)于資金和人力都處于全球性環(huán)境中的工程界而言，縮短產(chǎn)品研制開(kāi)發(fā)周期也是有益的。能夠設(shè)計(jì)和制造各種產(chǎn)品和制造各種產(chǎn)品的人可以在世界各地找到。但是，具有創(chuàng)新思想的人則比較難找。對(duì)于已經(jīng)進(jìn)行6個(gè)月的研制開(kāi)發(fā)工作的人，地里上的距離已經(jīng)不再是其他人發(fā)現(xiàn)他的障礙。如果你的研發(fā)周期較短，只要仍然保持領(lǐng)先，這種情況并不造成嚴(yán)重后果。如果正處于一個(gè)長(zhǎng)達(dá)6年的研制開(kāi)發(fā)過(guò)程中期，一個(gè)競(jìng)爭(zhēng)對(duì)手了解到你的研究工作的一些信息，這個(gè)項(xiàng)目將面臨比較大的麻煩。 工程師們?cè)诮鉀Q任何問(wèn)題時(shí)都需要進(jìn)行新的設(shè)計(jì)這種觀念很快就過(guò)時(shí)了，在現(xiàn)在設(shè)計(jì)中的第一步是瀏覽因特網(wǎng)或者其他信息系統(tǒng)，看其他人是否設(shè)計(jì)了一種類似于你所需要的產(chǎn)品，諸如船東裝置或換熱器等。通過(guò)這些信息系統(tǒng)，你可能發(fā)現(xiàn)有些人已經(jīng)有了制造圖紙，數(shù)控紙帶和制造你的產(chǎn)品所需要的其他東西。這樣，工程師們就可以把他們的職業(yè)技能集中在尚未解決的問(wèn)題上。 在解決這些問(wèn)題時(shí)，利用工作站和進(jìn)入信息高速公路可以大大增強(qiáng)工程小組的能力和效率。這些信息時(shí)代的工具可使工程小組利用大規(guī)模的數(shù)據(jù)庫(kù)。數(shù)據(jù)庫(kù)中有材料性能`標(biāo)準(zhǔn)`技術(shù)和成功的設(shè)計(jì)方案等信息。這些經(jīng)過(guò)驗(yàn)證的設(shè)計(jì)可以通過(guò)下載直接應(yīng)用，或者對(duì)其進(jìn)行快速`簡(jiǎn)單的改進(jìn)來(lái)滿足特定的要求。將產(chǎn)品的技術(shù)要求通過(guò)網(wǎng)絡(luò)送出去的遠(yuǎn)程制造也是可行的。你可以建立一個(gè)沒(méi)有任何加工設(shè)備的虛擬公司，可以只是制造商，在產(chǎn)品加工完成后，將其直接送給你的客戶。定期訪問(wèn)你的客戶可以保證你設(shè)計(jì)的產(chǎn)品按照設(shè)計(jì)要求進(jìn)行工作。盡管這些研制開(kāi)發(fā)方式不可能對(duì)每個(gè)公司都完全適用，但是這種可能性是存在的。 過(guò)去客戶設(shè)計(jì)的產(chǎn)品，通常是由小公司制造的。大公司不屑于制造這些產(chǎn)品-----他們討厭瞄準(zhǔn)機(jī)會(huì)的市場(chǎng)，或者是與客戶設(shè)計(jì)的小批量大交道。“這就是我的產(chǎn)品，”一家大公司這樣說(shuō)，“這是我們能夠制造出來(lái)的最好產(chǎn)品----你應(yīng)該喜歡他。如果你不喜歡，順這條街走有一家小公司，它會(huì)按你的要求做?！? 今天，因?yàn)轭櫩蛡冇州^大的選擇余地，幾乎所有的市場(chǎng)都是瞄準(zhǔn)機(jī)會(huì)的市場(chǎng)。如果你不能使產(chǎn)品滿足某些特定客戶的要求，你將失去市場(chǎng)份額中的一大部分，或者失去全部份額。由于這些瞄準(zhǔn)機(jī)會(huì)的市場(chǎng)是經(jīng)常變化的，你告訴應(yīng)該對(duì)市場(chǎng)做出快速的反應(yīng)。 瞄準(zhǔn)機(jī)會(huì)的市場(chǎng)和根據(jù)客戶要求進(jìn)行設(shè)計(jì)這種現(xiàn)象的出現(xiàn)，改變了工程師們未能進(jìn)行研究工作的方式。今天，研究工作通常是針對(duì)解決特定問(wèn)題進(jìn)行的。許多有政府資助或者由大公司出資開(kāi)發(fā)的技術(shù)可以在非常低的成本下輩自由使用盡管這種情況是暫時(shí)的，對(duì)這些技術(shù)進(jìn)行適當(dāng)改進(jìn)后，他們通?？梢员恢苯佑糜诋a(chǎn)品開(kāi)發(fā)，這使得許多公司可以節(jié)省昂貴的研究經(jīng)費(fèi)。在主要的技術(shù)障礙被克服后，研究工作應(yīng)該主要致力于產(chǎn)品的商品化方面，而不失開(kāi)發(fā)新的，有趣的，不確定的替換產(chǎn)品。 采用上述觀點(diǎn)看問(wèn)題，工程研究應(yīng)該致力于消除將已知的技術(shù)快速商品化的障礙。工作的重點(diǎn)是產(chǎn)品的質(zhì)量和可靠性，這些在當(dāng)今的顧客的頭腦中是最重要的。很明顯，一個(gè)質(zhì)量差的聲譽(yù)是一個(gè)不好的企業(yè)的同義詞。企業(yè)應(yīng)該盡最大的努力來(lái)保證客戶得到合格的產(chǎn)品，這個(gè)努力包括在生產(chǎn)線的中斷對(duì)產(chǎn)品進(jìn)行嚴(yán)格的檢驗(yàn)和自動(dòng)更換有缺陷的產(chǎn)品。 研究工作應(yīng)該著重考慮諸如可靠性等因素對(duì)成本帶來(lái)的益處，當(dāng)可靠性提高時(shí)制造成本和系統(tǒng)的最終成本將會(huì)降低。如果在生產(chǎn)線的終端產(chǎn)生30%的廢品，這不僅會(huì)浪費(fèi)金錢，也會(huì)給你的競(jìng)爭(zhēng)對(duì)手創(chuàng)造一個(gè)利用你的想法制造產(chǎn)品，并且將其銷售給你的客戶良機(jī)。 提高可靠性和合降低成本這個(gè)過(guò)程的關(guān)鍵是深入廣泛的利用設(shè)計(jì)軟件。設(shè)計(jì)軟件可以使工程師加快每個(gè)階段的設(shè)計(jì)工作。然而，僅僅縮短每個(gè)階段的設(shè)計(jì)時(shí)間，可能不會(huì)顯著的縮短整個(gè)設(shè)計(jì)的時(shí)間。因而，必須致力于并行工程軟件，這樣可以使所有者，即組的成員都能使用共同的數(shù)據(jù)庫(kù)。 隨著人們步入信息時(shí)代，要取得成功，工程師們?cè)诩夹g(shù)開(kāi)發(fā)和技術(shù)管理方面都應(yīng)該具有一些獨(dú)特的知識(shí)和經(jīng)驗(yàn)。成功的工程師們不但一個(gè)具有寬廣的知識(shí)和技能，而且還應(yīng)該是某些關(guān)鍵技術(shù)或?qū)W科的專家，他們還應(yīng)該在社會(huì)因素和經(jīng)濟(jì)因素對(duì)市場(chǎng)的影響方面有敏銳的洞察力。將來(lái)，花在解決日常工程問(wèn)題上的費(fèi)用將會(huì)減少，工程師們將會(huì)在一些更富有挑戰(zhàn)性，更亟待解決的問(wèn)題上協(xié)同工作，大大縮短解決這些問(wèn)題所需要的時(shí)間。我們已經(jīng)開(kāi)始了工程實(shí)踐的新階段。計(jì)算機(jī)和網(wǎng)絡(luò)工程師們具有越來(lái)越強(qiáng)的解決問(wèn)題的能力，這些也給我們的工作帶來(lái)很大的希望和喜悅。為了確保成功，我們所使用工具的性能和對(duì)更好的產(chǎn)品與系統(tǒng)的不斷追求，應(yīng)該與標(biāo)志著在工程方面所有巨大努力的創(chuàng)新工作所帶來(lái)的喜悅相適應(yīng)。機(jī)械工程是一個(gè)偉大的行業(yè)，在我們盡可能多的利用了信息時(shí)代所提供的機(jī)遇后，他將變得更加偉大。 - 12 -