這是一個關(guān)于機械工程專業(yè)英語介紹PPT課件，主要介紹研究產(chǎn)品的尺寸、形狀和詳細結(jié)構(gòu)的基本構(gòu)思，還要研究產(chǎn)品在制造、銷售和使用等方面的問題�，F(xiàn)代技術(shù)對零件尺寸精度的要求越來越嚴格。而且，目前許多零部件是由散步在各地的不同廠家生產(chǎn)的，因此必須對這些零件的尺寸和生產(chǎn)作出嚴格的規(guī)定，以保證它們具有互換性。在不影響零件性能的情況下，應(yīng)當給尺寸盡可能大的公差，以把生產(chǎn)成本降至最低。制造成本會隨著公差的降低而升高。9 Introduction to Mechanical Design Tolerance，公差 Basic size 基本尺寸 Actual size 實際尺寸 Deviation 偏差 Upper deviation 上偏差 Lower deviation 下偏差 Tolerance symbols 公差符號 Roughness 粗糙度，歡迎點擊下載機械工程專業(yè)英語介紹PPT課件哦。

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TECHNICAL ENGLISH MECHANICAL ENGINEERING YAN NU 9. Introduction to Mechanical Design 9 Introduction to Mechanical Design Bug ： A defect in a system or design 9 Introduction to Mechanical Design Mechanical design is the application of science and technology to devise new or improved products for the purpose of satisfying human needs. It is a vast field of engineering technology which not only concerns itself with the original conception of the product in terms of its size， shape and construction details， but also considers the various factors involved in the manufacture， marketing and use of the product. 9 Introduction to Mechanical Design Mechanical design is the application of science and technology to devise new or improved products for the purpose of satisfying human needs. It is a vast field of engineering technology which not only concerns itself with the original conception of the product in terms of its size， shape and construction details， but also considers the various factors involved in the manufacture， marketing and use of the product. 9 Introduction to Mechanical Design Mechanical design should be considered to be an opportunity to use innovative talents to envision a design of a product， to analyze the system and then make sound judgments on how the product is to be manufactured. It is important to understand the fundamentals of engineering rather than memorize mere facts and equations. There are no facts or equations which alone can be used to provide all the correct decisions required to produce a good design. 9 Introduction to Mechanical Design Mechanical design should be considered to be an opportunity to use innovative talents to envision a design of a product， to analyze the system and then make sound judgments on how the product is to be manufactured. It is important to understand the fundamentals of engineering rather than memorize mere facts and equations. There are no facts or equations which alone can be used to provide all the correct decisions required to produce a good design. 9 Introduction to Mechanical Design During the beginning stages of design， creativity should be allowed to flourish without a great number of constraints. Even though many impractical ideas may arise， it is usually easy to eliminate them in the early stages of design before firm details are required by manufacturing. In this way， innovative ideas are not inhibited. Quite often， more than one design is developed， up to the point where they can be compared against each other. 9 Introduction to Mechanical Design 在設(shè)計的初始階段，應(yīng)該允許設(shè)計人員充分發(fā)揮創(chuàng)造性，不受各種約束。即使產(chǎn)生了許多不切合實際的想法，也會在設(shè)計的早期，即繪制生產(chǎn)圖紙之前被改正掉。只有這樣，才不至于堵塞創(chuàng)新的思路。通常要提出幾套設(shè)計方案，然后加以比較。 9 Introduction to Mechanical Design Another important point which should be recognized is that a design engineer must be able to communicate ideas to other people if they are to be incorporated. Communicating the design to others is the final， vital step in the design process. Undoubtedly many great designs， inventions， and creative works have been lost to mankind simply because the originators were unable or unwilling to explain their accomplishments to others. 9 Introduction to Mechanical Design Another important point which should be recognized is that a design engineer must be able to communicate ideas to other people if they are to be incorporated. Communicating the design to others is the final， vital step in the design process. Undoubtedly many great designs， inventions， and creative works have been lost to mankind simply because the originators were unable or unwilling to explain their accomplishments to others. 9 Introduction to Mechanical Design The competent engineer should not be afraid of the possibility of not succeeding in a presentation. In fact， occasional failure should be expected because failure or criticism seems to accompany every really creative idea. There is a great deal to be learned from a failure， and the greatest gains are obtained by those willing to risk defeat. 9 Introduction to Mechanical Design The competent engineer should not be afraid of the possibility of not succeeding in a presentation. In fact， occasional failure should be expected because failure or criticism seems to accompany every really creative idea. There is a great deal to be learned from a failure， and the greatest gains are obtained by those willing to risk defeat. 9 Introduction to Mechanical Design Translation exercise: Today’s technology requires that parts be specified with increasingly exact dimensions(尺寸）. Many parts made by different companies at widely separated locations must be interchangeable， which requires precise size specifications production. 現(xiàn)代技術(shù)對零件尺寸精度的要求越來越嚴格。而且，目前許多零部件是由散步在各地的不同廠家生產(chǎn)的，因此必須對這些零件的尺寸和生產(chǎn)作出嚴格的規(guī)定，以保證它們具有互換性。 9 Introduction to Mechanical Design The technique of dimensioning parts within a required range of variation to ensure interchangeable is called tolerancing. Each dimension is allowed a certain degree of variation within a specified zone， or tolerance. For example， a part’ dimension might be expressed as 20±0.50， which allows a tolerance (variation in size) of 1.00 mm. 給零件標注尺寸使其在一個規(guī)定的區(qū)間內(nèi)變動，以保證它們具有互換性的技術(shù)稱為公差技術(shù)。允許每個尺寸在規(guī)定范圍內(nèi)具有一定的變動量，稱為公差。例如，一個零件的尺寸可以被表示成20±0.50，其公差（尺寸變動量）為1.00 mm。 9 Introduction to Mechanical Design A tolerance should be as large as possible without interfering with the function of the part to minimize production costs. Manufacturing costs increase as tolerance become smaller. 在不影響零件性能的情況下，應(yīng)當給尺寸盡可能大的公差，以把生產(chǎn)成本降至最低。制造成本會隨著公差的降低而升高。 9 Introduction to Mechanical Design Tolerance， 公差 Basic size 基本尺寸 Actual size 實際尺寸 Deviation 偏差 Upper deviation 上偏差 Lower deviation 下偏差 Tolerance symbols 公差符號 Roughness 粗糙度lLq紅軟基地

機械工程專業(yè)英語翻譯PPT課件：這是一個關(guān)于機械工程專業(yè)英語翻譯PPT課件，主要介紹機械工程的專業(yè)英語的相關(guān)內(nèi)容。機械工程 專業(yè)英語課程介紹學(xué)習(xí)專業(yè)英語的重要性學(xué)習(xí)目的為何在大三開設(shè)這門課程專業(yè)英語的英文名稱“專業(yè)英語”----- English for Special Purpose Specified English for ……. “機械工程專業(yè)英語” Specified English for Mechanical Engineering 專業(yè)英語和普通英語的區(qū)別 一. 詞義特點 1. 根據(jù)詞類辨明詞義 e.g: (1) Round (adj.) surface reflector is a key unit for the solar energy device. 曲面反射器是太陽能裝置的關(guān)鍵元件。 ( 2) This is the whole round (n.) of knowledge. 這是全部知識范圍。 2. 區(qū)分場合確定詞義（不同的場合，詞義也不一樣。要根據(jù) 上下文和語言環(huán)境來確定詞義） e.g: (1) pig: 豬 ~ iron 生鐵 (機械專業(yè)) ~ metal 金屬錠 ~ copper 生銅 (2) dog: 狗 (機械專業(yè)) ~ 雞心夾頭, 擋塊 3. 按照習(xí)慣搭配詞義 e.g: (1) I have a short memory. (2) This biscuit eats short. (3) Indeed he has a short temper. 4. 聯(lián)系上下文活用詞義 e.g: (1) There is no physical contact between tool and workpiece. 工具和工件之間沒有有形（直接）的接觸。 (2) High-speed grinding does not know this disadvantage 高速磨削不知道（存在）這個缺點，歡迎點擊下載機械工程專業(yè)英語翻譯PPT課件哦。

機械工程專業(yè)描述PPT課件：這是一個關(guān)于機械工程專業(yè)描述PPT課件，主要介紹現(xiàn)代機械設(shè)計理論與方法、機械系統(tǒng)動力學(xué)、機電一體化系統(tǒng)設(shè)計、第二模塊：數(shù)控技術(shù)、先進制造技術(shù)、精密與特種加工、第三模塊：機電傳動控制、狀態(tài)監(jiān)測與故障診斷、可編程控制技術(shù)。課程模塊第一模塊：現(xiàn)代機械設(shè)計理論與方法、機械系統(tǒng)動力學(xué)、機電一體化系統(tǒng)設(shè)計第二模塊：數(shù)控技術(shù)、先進制造技術(shù)、精密與特種加工第三模塊：機電傳動控制、狀態(tài)監(jiān)測與故障診斷、可編程控制技術(shù)第四模塊：發(fā)動機原理、工程車輛設(shè)計、車輛構(gòu)造第五模塊：測控電路、自動控制元件、測控儀器設(shè)計研討課：煤礦綜采自動、機械創(chuàng)新設(shè)計、液壓傳動系統(tǒng)、機電設(shè)備管理雙語課： Foundation of Mechanical Engineering and Automation(機械工程及自動化基礎(chǔ)) Introduction of MEMS Technology(MEMS微機電系統(tǒng)技術(shù)概論) Contemporary integrated manufacturing system(現(xiàn)代集成制造系統(tǒng)) The Technology of Robot(機器人技術(shù)) 現(xiàn)代機械設(shè)計理論與方法先修課程：高等數(shù)學(xué)、概率論與數(shù)理統(tǒng)計、機械制圖、工程力學(xué)、機械原理、機械設(shè)計內(nèi)容簡介：本課講述現(xiàn)代機械設(shè)計的基本概念、思想和方法，并通過實例說明現(xiàn)代設(shè)計的具體應(yīng)用。其主要內(nèi)容包括目前國際最流行的創(chuàng)新設(shè)計、綠色設(shè)計、穩(wěn)健設(shè)計、并行設(shè)計、反求工程設(shè)計、動態(tài)分析設(shè)計等現(xiàn)代設(shè)計方法；和現(xiàn)已普及應(yīng)用的優(yōu)化設(shè)計、有限元設(shè)計、可靠性設(shè)計等現(xiàn)代設(shè)計方法。對優(yōu)化設(shè)計、有限元設(shè)計、可靠性設(shè)計等成熟理論和方法作重點介紹。機械系統(tǒng)動力學(xué)先修課程：高等數(shù)學(xué)，機械制圖，理論力學(xué)，材料力學(xué)，機械原理，機械設(shè)計，計算機語言內(nèi)容簡介：機械系統(tǒng)動力學(xué)是機械動力類專業(yè)的專業(yè)選修課程，本課程的任務(wù)是使學(xué)生獲得機械系統(tǒng)動力學(xué)的基本理論與基本方法，目的在于培養(yǎng)學(xué)生研究機械系統(tǒng)中回轉(zhuǎn)構(gòu)件的扭轉(zhuǎn)振動與臨界轉(zhuǎn)速，桿的縱向振動，剛性轉(zhuǎn)子彈性支承的動力學(xué)分析，計入轉(zhuǎn)軸激勵的雙圓盤系統(tǒng)動力學(xué)，弦的橫向自由振動，齒輪系統(tǒng)的振動與固有頻率，凸輪機構(gòu)的動力學(xué)。機電一體化系統(tǒng)設(shè)計先修課程：機械原理、機械設(shè)計、電工技術(shù)與電子技術(shù)、測試技術(shù)、控制工程基礎(chǔ)、單片微機原理與接口技術(shù)等內(nèi)容簡介：本課程是機械設(shè)計及其自動化專業(yè)方向的專業(yè)核心課程，歡迎點擊下載機械工程專業(yè)描述PPT課件哦。

機械工程專業(yè)介紹PPT課件：這是一個關(guān)于機械工程專業(yè)介紹PPT課件，主要介紹機械工程是以有關(guān)的自然科學(xué)和技術(shù)科學(xué)為理論基礎(chǔ)，結(jié)合生產(chǎn)實踐中的技術(shù)經(jīng)驗，研究和解決在開發(fā)、設(shè)計、制造、安裝、運用和修理各種機械中的全部理論和實際問題的應(yīng)用學(xué)科。機械工程 1、什么是機械工程？ 機械工程是以有關(guān)的自然科學(xué)和技術(shù)科學(xué)為理論基礎(chǔ)，結(jié)合生產(chǎn)實踐中的技術(shù)經(jīng)驗，研究和解決在開發(fā)、設(shè)計、制造、安裝、運用和修理各種機械中的全部理論和實際問題的應(yīng)用學(xué)科。 2、機械工程的發(fā)展史 2、機械工程的發(fā)展史 公元前三~四千年左右，人類發(fā)現(xiàn)金屬，學(xué)會熔煉，制造出任意形狀的青銅工具。 2、機械工程的發(fā)展史近代：工業(yè)革命 1）從手動到自動 ①1733年約翰·凱伊的飛梭 2、機械工程的發(fā)展史 ②1738年懷特·鮑爾的滾筒 2、機械工程的發(fā)展史 ③卡特賴托的動力紡織機 1786年，改進后，成功使各種動作實現(xiàn)了自動化，如穿梭、綜 絖（為制道梭道使經(jīng)線向上的用具）舉起，停止緯線的方向、卷經(jīng)線、取下織成的織物、經(jīng)線上漿等。 2、機械工程的發(fā)展史 ④從大氣壓的發(fā)現(xiàn)到蒸汽機的完成 瓦特的蒸汽機 2、機械工程的發(fā)展史 2、機械工程的發(fā)展史 ⑤機床的問世 2、機械工程的發(fā)展史 2、機械工程的發(fā)展史 ⑥開始了鋼鐵時代 2、機械工程的發(fā)展史 ⑦動力的發(fā)展與進步 蒸汽機車 2、機械工程的發(fā)展史 汽輪機、水輪機 2、機械工程的發(fā)展史戴姆勒28歲以前一直在學(xué)習(xí)機械方面的理論和實踐知識，1872年進入奧托公司工作，1882年，他辭掉了工作，和邁巴赫共同在堪休塔特建立了汽車試驗廠。戴姆勒在工廠開始了研究，首先發(fā)明了汽油的發(fā)動機。發(fā)明白熱管點火法，制造出900r/min的內(nèi)燃機，歡迎點擊下載機械工程專業(yè)介紹PPT課件哦。