【摘要】：減速機(jī)是一種用于原動(dòng)機(jī)和工作機(jī)之間的封閉式的傳動(dòng)裝置，它主要有增大扭矩、降低轉(zhuǎn)速的功能，以便帶動(dòng)大扭矩的機(jī)械。按傳統(tǒng)的習(xí)慣性思維，，齒輪減速機(jī)設(shè)計(jì)總是針對(duì)某一具體產(chǎn)品的，從部件到零件，所設(shè)計(jì)的幾何模型尺寸值往往是固定的，零件的結(jié)構(gòu)形狀不能根據(jù)需要而靈活地改變，設(shè)計(jì)師如需改變產(chǎn)品的尺寸，就要再次進(jìn)行繁復(fù)的、類似的設(shè)計(jì)計(jì)算過程，重新繪制其對(duì)應(yīng)的幾何模型。由此可見，這樣的傳統(tǒng)設(shè)計(jì)方法因繼承性很差，造成新產(chǎn)品設(shè)計(jì)周期很長。基于實(shí)例推理的設(shè)計(jì)方法近年來逐漸應(yīng)用于工程設(shè)計(jì)領(lǐng)域，發(fā)展較快，其核心思想是人類經(jīng)驗(yàn)的再利用。當(dāng)設(shè)計(jì)者接受一個(gè)新的設(shè)計(jì)任務(wù)時(shí)，以往設(shè)計(jì)中曾經(jīng)做過的與當(dāng)前設(shè)計(jì)相類似的設(shè)計(jì)樣板往往會(huì)首先浮現(xiàn)在其腦海中，經(jīng)比較兩者之間的不同點(diǎn)，進(jìn)行修改和調(diào)整，并按設(shè)計(jì)原則產(chǎn)生新的設(shè)計(jì)方案�；趯�(shí)例推理的設(shè)計(jì)希望利用計(jì)算機(jī)再現(xiàn)這一過程。 本論文正是針對(duì)上述問題，以基于實(shí)例推理的產(chǎn)品設(shè)計(jì)方法作為研究對(duì)象，而研究的實(shí)例則選取齒輪減速機(jī)設(shè)計(jì)，在了解、分析國內(nèi)外研究現(xiàn)狀的基礎(chǔ)上，著重研究設(shè)計(jì)中的關(guān)鍵技術(shù)與實(shí)現(xiàn)方法。主要研究內(nèi)容為： 1.采用以特征建模和參數(shù)化技術(shù)相結(jié)合的建模方法對(duì)齒輪減速機(jī)實(shí)例進(jìn)行建模，建立了三維模型庫，并對(duì)實(shí)例的表達(dá)以及實(shí)例庫的組織結(jié)構(gòu)進(jìn)行了研究。 2.在分析了傳統(tǒng)檢索算法優(yōu)缺點(diǎn)的基礎(chǔ)上，研究了實(shí)例的檢索算法，并針對(duì)減速機(jī)的特點(diǎn)，提出了適合于不同特征屬性的實(shí)例檢索算法。 3.研究了實(shí)例的評(píng)價(jià)方法，借助于UG NX軟件的虛擬裝配技術(shù)和分析功能，對(duì)裝配件進(jìn)行了干涉檢測(cè)，給出了裝配評(píng)價(jià)的一般方法。 4.將基于實(shí)例推理與產(chǎn)品設(shè)計(jì)結(jié)合的技術(shù)應(yīng)用于齒輪減速機(jī)設(shè)計(jì)，給出了基于實(shí)例推理的齒輪減速機(jī)三維CAD設(shè)計(jì)系統(tǒng)的設(shè)計(jì)方法。以三維軟件為平臺(tái)，開發(fā)了一個(gè)簡單的基于實(shí)例推理的齒輪減速機(jī)三維CAD設(shè)計(jì)系統(tǒng)模型。
[Abstract]:Reducer is a kind of closed transmission device between prime mover and working machine. It mainly has the function of increasing torque and reducing rotating speed in order to drive large torque. According to the traditional habitual thinking, the design of gear reducer is always aimed at a specific product. From the parts to the parts, the geometric model dimensions are often fixed, and the structural shape of the parts can not be changed flexibly according to the needs. If the designer needs to change the size of the product, he must carry on the complicated, similar design calculation process again, and redraw its corresponding geometric model. Thus it can be seen that because of the poor inheritance of such traditional design methods, the new product design cycle is very long. In recent years, the design method based on case-based reasoning has been gradually applied to the field of engineering design, and its core idea is the reuse of human experience. When a designer accepts a new design task, the design template that has been similar to the current design in the past often comes to mind first, and the differences between the two are compared, modified and adjusted. And according to the design principles to produce a new design scheme. The design based on case-based reasoning hopes to reproduce this process by computer. In order to solve the above problems, this paper takes the product design method based on case-based reasoning as the research object, and the research example selects the gear reducer design, on the basis of understanding and analyzing the research status at home and abroad. Emphasis is placed on the key technologies and implementation methods in the design. The main research contents are as follows: 1. The example of gear reducer is modeled by the combination of feature modeling and parametric technology, and the three-dimensional model base is established, and the expression of the example and the organization structure of the case base are studied. two銆

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