機(jī)械類(lèi)外文翻譯---自動(dòng)車(chē)床系統(tǒng)設(shè)計(jì)的研究

1、<p>　　自動(dòng)車(chē)床系統(tǒng)設(shè)計(jì)的研究</p><p>　　摘要：車(chē)床數(shù)字化設(shè)計(jì)系統(tǒng)的開(kāi)發(fā)，是通過(guò)工程知識(shí)相關(guān)的技術(shù)和產(chǎn)品的參數(shù)化設(shè)計(jì)技術(shù)之間的融合發(fā)展起來(lái)的。設(shè)計(jì)系統(tǒng)的框架在細(xì)節(jié)上表現(xiàn)為主控模塊，初始化模塊，三維和二維的更新管理模塊，知識(shí)管理模塊和知識(shí)庫(kù)。本文對(duì)系統(tǒng)的關(guān)鍵技術(shù)設(shè)計(jì)比如知識(shí)挖掘與分類(lèi)、自動(dòng)變換結(jié)構(gòu)設(shè)計(jì)、建立數(shù)據(jù)庫(kù)、自動(dòng)設(shè)計(jì)變結(jié)構(gòu)與車(chē)床設(shè)計(jì)導(dǎo)航進(jìn)行了進(jìn)一步研究。最后，本文對(duì)自動(dòng)設(shè)計(jì)系統(tǒng)的界面和

2、設(shè)計(jì)過(guò)程進(jìn)行了詳細(xì)的介紹。</p><p>　　關(guān)鍵詞：車(chē)床；知識(shí)重組；自動(dòng)設(shè)計(jì)系統(tǒng)</p><p><b>　　一、導(dǎo)言</b></p><p>　　新一代的數(shù)碼解決方案使技術(shù)創(chuàng)新能在不同的環(huán)境下進(jìn)行，并且減少整個(gè)產(chǎn)品的開(kāi)發(fā)周期、節(jié)省時(shí)間和提高產(chǎn)品質(zhì)量。目前，在消費(fèi)產(chǎn)品的研發(fā)中采用不同的方法進(jìn)行快速設(shè)計(jì)并取得了成果，然而對(duì)于商業(yè)產(chǎn)品卻很少受到

3、注意，特別是機(jī)床，目前尚未對(duì)其進(jìn)行研究。我們的第二個(gè)目的是衡量不同的人群在同一個(gè)測(cè)試中表現(xiàn)出來(lái)的不同的敏感性。該階段的研究是很詳盡的，包括：對(duì)描述的選擇，對(duì)圖像的選擇和對(duì)所參與人群的選擇。結(jié)果表明，這些技術(shù)也適用于機(jī)床的設(shè)計(jì)，不同的群體對(duì)機(jī)器的認(rèn)識(shí)也是不同的，在某些方面的差異，并不僅限于用戶與專(zhuān)家在相關(guān)的行業(yè)中這種差異依然存在，在相關(guān)行業(yè)中通常是根據(jù)技術(shù)規(guī)格來(lái)決定機(jī)器的購(gòu)買(mǎi)或使用。這些技術(shù)規(guī)范是可以測(cè)量的，但機(jī)器一些重要的參數(shù)，如便捷性

4、，安全性，耐用性等卻不那么容易衡量和比較。本文表明，語(yǔ)義差別的方法是用來(lái)衡量這些性能的一種可能途徑。</p><p>　　車(chē)床的設(shè)計(jì)是復(fù)雜的過(guò)程，在設(shè)計(jì)的過(guò)程中很多知識(shí)都是必要的。在生產(chǎn)的過(guò)程當(dāng)中，不同的知識(shí)在不同產(chǎn)品不同開(kāi)發(fā)階段中起不同的作用。許多新產(chǎn)品是在原有產(chǎn)品的基礎(chǔ)上設(shè)計(jì)發(fā)展起來(lái)的。車(chē)床設(shè)計(jì)行業(yè)的設(shè)計(jì)成果中，幾乎60％是由組件設(shè)計(jì)的重組制作而成的，30％是根據(jù)過(guò)去的產(chǎn)品修訂的。在本文中，我們提出了一個(gè)車(chē)床

5、設(shè)計(jì)技術(shù)，采用NX平臺(tái)，建立了車(chē)床設(shè)計(jì)的專(zhuān)門(mén)知識(shí)庫(kù)，并融入新產(chǎn)品的設(shè)計(jì)理念和成熟的設(shè)計(jì)經(jīng)驗(yàn)，運(yùn)用先進(jìn)的開(kāi)發(fā)工具，如UG/ Open API，UIStyler，MenuScript 。</p><p>　　這種新方法可以有效地提供設(shè)計(jì)質(zhì)量保證，縮短產(chǎn)品設(shè)計(jì)周期，提高設(shè)計(jì)效率和車(chē)床水平，并且對(duì)汽車(chē)玻璃行業(yè)有重大影響力。</p><p>　　車(chē)床設(shè)計(jì)系統(tǒng)應(yīng)用所學(xué)到的知識(shí)來(lái)完成車(chē)床快速設(shè)計(jì)。設(shè)計(jì)系

6、統(tǒng)過(guò)程中所需要應(yīng)用的知識(shí)包括成熟的車(chē)床產(chǎn)品，車(chē)床設(shè)計(jì)標(biāo)準(zhǔn)的有關(guān)技術(shù)數(shù)據(jù)，專(zhuān)業(yè)知識(shí)，豐富的設(shè)計(jì)經(jīng)驗(yàn)和最新的研究成果。在產(chǎn)品設(shè)計(jì)周期中，嵌入式系統(tǒng)需要設(shè)計(jì)論證和設(shè)計(jì)指導(dǎo)機(jī)制。而且設(shè)計(jì)師只需要輸入?yún)?shù)并由人機(jī)界面通過(guò)索引的幫助下符合客戶要求即可。這些參數(shù)包括車(chē)床厚度，鉗板的長(zhǎng)度等，推理機(jī)將與每一個(gè)規(guī)則所規(guī)定的條件進(jìn)行比較，如果它們匹配，則該規(guī)則的結(jié)論將作為一個(gè)新的事實(shí)被添加到設(shè)計(jì)知識(shí)庫(kù)。根據(jù)發(fā)展過(guò)程中的需求，該系統(tǒng)分為以下功能模塊。系統(tǒng)開(kāi)發(fā)的

7、目的是通過(guò)知識(shí)重組來(lái)實(shí)現(xiàn)自動(dòng)車(chē)床的設(shè)計(jì)，提高產(chǎn)品的設(shè)計(jì)質(zhì)量和效率。以檢查軌距為導(dǎo)向的車(chē)床設(shè)計(jì)系統(tǒng)的設(shè)計(jì)過(guò)程可分為：需求分析階段，初步設(shè)計(jì)階段，詳細(xì)設(shè)計(jì)階段和功能的改進(jìn)、測(cè)試階段。在需求分析階段，經(jīng)過(guò)仔細(xì)分析和對(duì)話，系統(tǒng)能夠根據(jù)用戶設(shè)置的鉗板曲線設(shè)計(jì)車(chē)床形狀，實(shí)現(xiàn)自動(dòng)車(chē)床重點(diǎn)部分的設(shè)計(jì)，自動(dòng)創(chuàng)建一套車(chē)床。</p><p>　　在選擇開(kāi)發(fā)工具方面，我們考慮了用戶的要求以及對(duì)一些工具的熟練程度，最終決定采用UG NX5

8、.0和Visual Studio 2005作為開(kāi)發(fā)平臺(tái)。在詳細(xì)設(shè)計(jì)階段，我們先在UG互動(dòng)的環(huán)境一步一步進(jìn)行設(shè)計(jì)，然后由應(yīng)用程序最終完成。該方案的主體部分僅僅是在前文提到的上述階段實(shí)現(xiàn)的，但是在應(yīng)用過(guò)程中一些細(xì)節(jié)沒(méi)有完全考慮進(jìn)去，在提高產(chǎn)品性能的階段，我們做了詳細(xì)的測(cè)試，一些錯(cuò)誤已經(jīng)得到糾正。這有助于使系統(tǒng)更加穩(wěn)定和完善。</p><p><b>　　A.設(shè)計(jì)知識(shí)表示</b></p&g

9、t;<p>　　有效的知識(shí)表示方法是進(jìn)行知識(shí)融合和知識(shí)重組的關(guān)鍵。目前，常見(jiàn)的知識(shí)表示方法，包括動(dòng)詞的邏輯表示，產(chǎn)生式規(guī)則，幀表示，面向?qū)ο蟮谋硎镜?，本文中生成型?chē)床的設(shè)計(jì)規(guī)則說(shuō)明如下：</p><p>　　<Rule>∷=（IF{<Condition>} THEN {<Result>}）</p><p>　　< Condition

10、>∷=(<Expression>∣<Fact>)</p><p>　　< Expression >∷=({<Variant><Verb><Attribute>})</p><p>　　< Fact >∷=({<Fact item>})</p><p>　　<

11、Verb >∷=(< > = + - * / sin、cos、tg、log …)</p><p>　　< Attribute value>∷=({< Variant >∣<Value>})</p><p>　　<Conclusion>∷=({<Presentation>∣<Operation>})&l

12、t;/p><p>　　< Presentation >∷=({< Presentation item>})</p><p>　　<Operation>∷=({<Operating function>})</p><p>　　例如，在嵌入塊成型，兩平面之間的關(guān)系（平行或交叉）（P1和P2）的車(chē)床設(shè)計(jì)是由法線向量（V1和V2）

13、來(lái)判斷。在這個(gè)例子中，三個(gè)規(guī)則可以從規(guī)則庫(kù)選取，有如下幾點(diǎn)：</p><p>　　規(guī)則1：如果V1×V2=0而且P1的矢量方向和P2是相同的，</p><p>　　則P1∥P2和P1和P2具有相同的向量方向。</p><p>　　規(guī)則2：如果V1×V2=0和P1的矢量方向和P2是相反的，</p><p>　　則P1∥P2和

14、P1和P2有相反的向量方向。</p><p>　　規(guī)則3：如果V1×V2≠0，P1的矢量方向和P2是不同的，</p><p>　　則P1和 P2的彼此相交。</p><p>　　車(chē)床設(shè)計(jì)的框架表示。幀，是另外一種知識(shí)表示形式的數(shù)據(jù)結(jié)構(gòu)，每幀作為一個(gè)知識(shí)單元，由馬文?明斯基在1975年提出。詳細(xì)的形式在下面的例子中說(shuō)明：</p><p&g

15、t;<b>　　<Frame></b></p><p><b>　　……</b></p><p>　　Slot name I：Flank name i1 (Value i11, Value i12, …)</p><p>　　Flank name i2 (Value i21, Value i22, …)<

16、/p><p>　　Slot name J：< Frame name></p><p><b>　　…</b></p><p>　　Slot name K：<Additive course></p><p>　　車(chē)床設(shè)計(jì)案例檢索。最創(chuàng)新的產(chǎn)品設(shè)計(jì)往往都基于以前的經(jīng)驗(yàn)和理論，因此，新產(chǎn)品許多地方繼承了原有

17、產(chǎn)品的設(shè)計(jì)。由于大多數(shù)產(chǎn)品的設(shè)計(jì)不是原來(lái)的，但以前的車(chē)床設(shè)計(jì)規(guī)則或流程仍可能會(huì)有所幫助。在本文中，我們提出了使用基于案例的推理方法來(lái)實(shí)現(xiàn)產(chǎn)品的車(chē)床設(shè)計(jì)的理念。</p><p>　　我們采用動(dòng)態(tài)存儲(chǔ)模型來(lái)表示系統(tǒng)中的案例。這意味著各種案件根據(jù)它們的一般特征來(lái)組織，并根據(jù)他們之間的分歧指數(shù)來(lái)區(qū)分它們。案例庫(kù)通過(guò)起關(guān)鍵作用的關(guān)系數(shù)據(jù)庫(kù)技術(shù)的產(chǎn)品ID建立起來(lái)。 SQL可作為初步檢索句子。例如，如果我們要查詢案例，可用下面

18、的偽代碼。</p><p>　　SELECT case number FROM case base</p><p>　　WHERE product ID =‘input value’</p><p>　　為了作進(jìn)一步的分析，車(chē)床設(shè)計(jì)要求能夠?qū)ζ溥M(jìn)行修改，以便適應(yīng)自動(dòng)探索設(shè)計(jì)空間。如果修改只影響某些參數(shù)的設(shè)置值而不觸及問(wèn)題的結(jié)構(gòu)，我們就說(shuō)它是一個(gè)參數(shù)化設(shè)計(jì)。對(duì)于過(guò)程流

19、相關(guān)的任務(wù)級(jí)應(yīng)用，進(jìn)程中沒(méi)有結(jié)構(gòu)性的變化，即，結(jié)構(gòu)設(shè)計(jì)是被限制的。對(duì)于序列中不同步驟的不同流程之間的比較，被映射到的一個(gè)給定步驟的影響在某些參數(shù)值的調(diào)節(jié)方面存在差異。例如，如果是兩個(gè)不同的進(jìn)程選項(xiàng)之間的比較，對(duì)其中一個(gè)植入額外的步驟，另一沒(méi)有此步驟，那么在植入的步驟參數(shù)值設(shè)置非常低的情況下就能很方便地建模，而在實(shí)際應(yīng)用中完全沒(méi)有這一步。</p><p>　　為了實(shí)現(xiàn)一般的參數(shù)化設(shè)計(jì)的產(chǎn)品，我們首先需要對(duì)產(chǎn)品進(jìn)行分

20、析，并確定組件之間的相互關(guān)系，包括：車(chē)床設(shè)計(jì)的關(guān)系、幾何關(guān)系和參數(shù)的關(guān)系。下一步，在數(shù)據(jù)，幀，條件語(yǔ)句，以及先進(jìn)的程序語(yǔ)言的形成過(guò)程中，需要對(duì)相關(guān)工程知識(shí)進(jìn)行收集、整理、一般化處理、提取和存儲(chǔ)。然后，需要對(duì)所有對(duì)產(chǎn)品性能有影響的工程參數(shù)加以界定，這可以用來(lái)采用模糊分析的方法通過(guò)工程參數(shù)對(duì)訂單要求的其他類(lèi)型的自動(dòng)車(chē)床進(jìn)行檢驗(yàn)。圖1顯示了車(chē)床的不同知識(shí)表達(dá)方式。</p><p>　　基本知識(shí)：基本車(chē)床知識(shí)包括：1）客

21、戶對(duì)車(chē)床的使用要求;2）對(duì)客戶潛在需求的預(yù)測(cè);3）相關(guān)的部件和組件設(shè)計(jì)的國(guó)際國(guó)內(nèi)標(biāo)準(zhǔn);4）以往的設(shè)計(jì)案例;5）在特殊的環(huán)境下對(duì)產(chǎn)品性能的要求;6）對(duì)不同的部件和組件的設(shè)計(jì)要求;7）車(chē)床不同零部件之間的設(shè)計(jì)聯(lián)系和幾何位置關(guān)系;8）不同材質(zhì)和規(guī)格零件的特性。通過(guò)對(duì)自動(dòng)車(chē)床基本知識(shí)的分析和研究，我們已經(jīng)制定出總體結(jié)構(gòu)的主要控制參數(shù)和大體的設(shè)計(jì)規(guī)則以及產(chǎn)品設(shè)計(jì)知識(shí)庫(kù)。</p><p>　　產(chǎn)品結(jié)構(gòu)知識(shí)：該系統(tǒng)采用自上而下

22、的設(shè)計(jì)方法來(lái)開(kāi)發(fā)產(chǎn)品型號(hào)。在建立產(chǎn)品模型之前就應(yīng)該確定出產(chǎn)品的結(jié)構(gòu)，因此應(yīng)該對(duì)影響產(chǎn)品結(jié)構(gòu)的知識(shí)進(jìn)行確認(rèn)、分析。產(chǎn)品結(jié)構(gòu)的知識(shí)，主要包括尺寸，形狀，車(chē)床的設(shè)計(jì)尺寸和不同零部件之間的位置關(guān)系。據(jù)NX平臺(tái)的特點(diǎn)，產(chǎn)品的整體框架知識(shí)包括基準(zhǔn)面產(chǎn)品結(jié)構(gòu)知識(shí)，車(chē)床零部件之間的設(shè)計(jì)限制，以及基于功能的組件的布局等。組成車(chē)床檢驗(yàn)設(shè)計(jì)的控制結(jié)構(gòu)建立在NX平臺(tái)上的產(chǎn)品草圖拓?fù)渲稀?lt;/p><p>　　產(chǎn)品設(shè)計(jì)過(guò)程的知識(shí)：產(chǎn)品設(shè)計(jì)

23、過(guò)程的知識(shí)主要包括產(chǎn)品設(shè)計(jì)流程、鑒定原則等，反映了基本知識(shí)和產(chǎn)品結(jié)構(gòu)知識(shí)之間的相互依存關(guān)系。在基本知識(shí)和產(chǎn)品結(jié)構(gòu)知識(shí)間聯(lián)系的基礎(chǔ)上，采用產(chǎn)品開(kāi)發(fā)工具UFun來(lái)實(shí)現(xiàn)產(chǎn)品設(shè)計(jì)的智能導(dǎo)航和自動(dòng)可變產(chǎn)品結(jié)構(gòu)設(shè)計(jì)。</p><p>　　B.可變結(jié)構(gòu)的自動(dòng)設(shè)計(jì)</p><p>　　作為一個(gè)典型的串行轉(zhuǎn)化產(chǎn)品，自動(dòng)車(chē)床的結(jié)構(gòu)形式隨用戶需求的變化而變化。本文采用一些先進(jìn)的技術(shù)解決可變結(jié)構(gòu)問(wèn)題，如維度的驅(qū)動(dòng)

24、技術(shù)，限制驅(qū)動(dòng)技術(shù)，幾何對(duì)象驅(qū)動(dòng)技術(shù)和數(shù)據(jù)制約技術(shù)。</p><p>　　畢業(yè)設(shè)計(jì)（論文）外文翻譯原文</p><p>　　Research on Lathe Automatic Design System</p><p>　　Abstract—A lathe digital design system was developed through the integ

25、ration between knowledge-engineering-related technology and product parametric design technology. The frame of the design system was expressed in detail such as main control module, initialization module, update manageme

26、nt module of 3D and 2D, knowledge management module and knowledge library. The key technologies of the system design such as Knowledge mining and classification, automatic design of transform structures, establ</p>

27、<p>　　Keywords-lathe; knowledge reuse; automatic design system</p><p>　　I. INTRODUCTION</p><p>　　The new age of digital solutions empowers innovation through different environments and tr

28、ansforms the entire product cycle development to reduce waste and lead time, all involved with the aiming for quality. Nowadays, different approaches to rapid design are being applied to consumer products with successful

29、 results, but commercial products have generally received less attention and machine tools in particular have not yet been studied. [1-3] Our second objective is to measure the different sen</p><p>　　Lathe d

30、esign is complicated procession in which lots of knowledge is necessary. The knowledge plays different parts on the different steps of product development. Many new products are developed on the base of existed design kn

31、owledge and effects. In lathe design industry, almost 60% of the design works are based on the reuse of existed component design and 30% of them are based on the revision of past parts [4-8]. In this paper we put forward

32、 an lathe design technique that adopts NX platform, e</p><p>　　This new way can effectively provide design quality supports, shorten product design period, improve the design efficiency and level of lathe, a

33、nd have a significant influence on auto glass industry.</p><p>　　II. PREPARE YOUR PAPER BEFORE STYLING</p><p>　　The lathe design system applies acquired knowledge to complete rapid design of lat

34、he. The knowledge that is applied in the design system includes mature lathe products, relevant engineering data of lathe design standard, expertise, accumulated design experience and latest research effects. During the

35、product design period, the system is embedded with design reasoning and design course guide mechanism. And designers only need to input parameters demanded by the customers through human-computer in</p><p>　

36、　In terms of choosing development tools, we have considered user’s requirements and proficiency degree toward some tools, and have decided to adopt UG NX5.0 and Visual Studio 2005 as the development platform to develop t

37、he system at last. During the detailed design phase, we get it done in the UG interactive environment step by step first, and then by applying program. The main body of the program is only achieved during the phases ment

38、ioned above and some details in applying course have not been</p><p>　　A. Design knowledge representation</p><p>　　Effective knowledge representation method is the key in implementing knowledge

39、fusion and knowledge reuse. At present, common knowledge representation methods include verb logic representation, generating type rules, frame representation, object-oriented representation, etc. In this paper generatin

40、g type lathe design rules are described as follows:</p><p>　　<Rule>∷=（IF{<Condition>} THEN {<Result>}）</p><p>　　< Condition >∷=(<Expression>∣<Fact>)</p>

41、<p>　　< Expression >∷=({<Variant><Verb><Attribute>})</p><p>　　< Fact >∷=({<Fact item>})</p><p>　　< Verb >∷=(< > = + - * / sin、cos、tg、log …)

42、</p><p>　　< Attribute value>∷=({< Variant >∣<Value>})</p><p>　　<Conclusion>∷=({<Presentation>∣<Operation>})</p><p>　　< Presentation >∷=({&l

43、t; Presentation item>})</p><p>　　<Operation>∷=({<Operating function>})</p><p>　　For example, in the lathe design of embedding block and molding, the relationship (parallel or inte

44、rsecting) of the two planes (P1 and P2) are judged by the normal vectors (V1 and V2). In this example, three rules can be procured from the rules library and they are as follows:</p><p>　　Rule1: IF V1×V

45、2=0 AND the vector directions of P1 and</p><p>　　P2 are the same.</p><p>　　THEN P1 ∥ P2 AND P1 and P2 have the same vector</p><p>　　directions.</p><p>　　Rule2: IF V1

46、15;V2=0 AND the vector directions of P1 and</p><p>　　P2 are opposite.</p><p>　　THEN P1 ∥ P2 AND P1 and P2 have the opposite vector</p><p>　　directions.</p><p>　　Rule3:

47、IF V1×V2≠0 AND the vector directions of P1 and</p><p>　　P2 are different.</p><p>　　THEN P1and P2 intersects with each other.</p><p>　　Lathe design Frame Representation. Frame,

48、put forward by Marvin Minsky in 1975, is another data structure of knowledge representation. Every frame is looked at as a knowledge unit. The detailed form is shown in the following example:</p><p><b>

49、;　　<Frame></b></p><p><b>　　……</b></p><p>　　Slot name I：Flank name i1 (Value i11, Value i12, …)</p><p>　　Flank name i2 (Value i21, Value i22, …)</p>&l

50、t;p>　　Slot name J：< Frame name></p><p><b>　　…</b></p><p>　　Slot name K：<Additive course></p><p>　　Lathe design Cases Retrieval. Most innovative products a

51、re designed based on previous experience and theory, thus, many parts of the new product design are inherited from the old product design. Since most design of products are not original, previous lathe design rules or pr

52、ocesses may be helpful. In this paper we present using a case-based reasoning method to implement product lathe design.</p><p>　　We adopt dynamic storage models to represent cases in the system. This means a

53、ll kinds of cases are organized based on their general characteristics and distinguished according to the index of their differences. The case library is built through a relation database technique where the product ID a

54、cts as the key. There SQL is available as the preliminary retrieval sentence. For instance, if we want to inquire a case, the following pseudo code is available.</p><p>　　SELECT case number FROM case base<

55、;/p><p>　　WHERE product ID =‘input value’</p><p>　　For further analysis, a design has to be able to be modified in order to be subjected to automatic exploration of the design space. If the modific

56、ation affects only the value of certain parameter settings while leaving the structure of the problem untouched, we speak of a parameterized design [9-12]. Forprocess-flow related task-level applications, no structural c

57、hanges in the process flow, i.e., the structure of the design, are admitted. In the case where comparisons between process flows with </p><p>　　To realize the general parameterized design of the product, we

58、first need to analyze the product, and determine the interrelation of the components, including: lathe design relationship, geometric relationship, and parametric relationship. Next, the relevant engineering knowledge ne

59、ed to be collected, arranged, generalized, abstracted and stored in the forms of data, frame, conditional sentence, and advanced program languages. [15-19]. Then, all influential engineering parameters of the product <

60、;/p><p>　　??Basic knowledge: The Basic knowledge of lathe includes: 1) Customer’s personal using requirement to lathe; 2) Customer’s potential demands prediction; 3) International and domestic standards for rel

61、ated parts and component design; 4) Previous design case; 5) Products’ performance requisition under a special environment; 6) Design requisition of different parts and component; 7) The lathe design relationship and geo

62、metric position among different parts and components; 8) The characters of parts</p><p>　　??Product structure knowledge: This system adopts topdown- based design method to develop product model. The product

63、structure should be determined before the establishment of product model, so the knowledge that influences product structure should be analyzed and determined. Product structure knowledge mainly includes out-shape dimens

64、ions, lathe design dimensions and position relationships between different parts and components. According to the characters of NX platform, the whole framework kn</p><p>　　Knowledge of product design proces

65、s: The knowledge of product design process mainly includes product design flow, appraisement principles, etc. and reflects the interdependence relationship between basic knowledge and product structure knowledge. On the

66、base of the interlinkage of basic knowledge and product structure knowledge, product developing tool UFun is used to achieve product design intelligent navigation and automatic design of variable product structure.</p

67、><p>　　B. Automatic design of variable structure</p><p>　　As a typical serial transforming product, the structure form of auto lathe changes with requirement change of users. In this paper some adv

68、anced techniques are adopted to tackle the variable structure issues, such as the dimension-driving technique, restriction-driving technique, geometric objects driving technique and data restraining technique.</p>