本文關(guān)鍵詞： 遺傳算法 實例推理 智能設(shè)計 空間分解 三維參數(shù)化建模　出處：《沈陽理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：伴隨著機(jī)械裝備制造業(yè)的快速發(fā)展零件的不斷復(fù)雜化、高精度化對機(jī)床行業(yè)也提出了高效率、高精度的要求,機(jī)床要想有所改變就要從設(shè)計入手,機(jī)床的設(shè)計是機(jī)床發(fā)展的基礎(chǔ),所以智能化設(shè)計機(jī)床是一個重要的研究方向。在數(shù)控車床的基礎(chǔ)上研究數(shù)控車床的智能設(shè)計系統(tǒng)(ICAD),本文的開始構(gòu)建了智能設(shè)計系統(tǒng)的總體框架,依次劃分為多級實例的空間描述、基于遺傳算法的數(shù)控車床方案設(shè)計、基于實例推理的數(shù)控車床詳細(xì)方案設(shè)計和三維參數(shù)化建模這四部分,要對關(guān)鍵部分的技術(shù)進(jìn)行分析研究,然后將各模塊的功能實現(xiàn)。多級實例的空間描述是系統(tǒng)的基礎(chǔ)部分。本文首先對數(shù)控機(jī)床做了空間分解,將復(fù)雜的實例分解成由各個功能模塊組成,這使得在設(shè)計中能較為準(zhǔn)確的確定每個模塊所能實現(xiàn)的功能。在分解時要分析相關(guān)的關(guān)聯(lián)度并將數(shù)控車床按功能分解與按結(jié)構(gòu)分解,它分解的好壞直接影響了遺傳算法與實例推理系統(tǒng)的性能。遺傳算法與實例推理系統(tǒng)是本文的核心。在遺傳算法系統(tǒng)部分要對設(shè)計要求轉(zhuǎn)換、分析各項指標(biāo)建立相應(yīng)的數(shù)學(xué)模型作為適應(yīng)度函數(shù),然后進(jìn)行選擇、交叉、變異優(yōu)選初步設(shè)計方案。在得到基本方案之后使用實例推理得到能滿足方案要求的近一步詳細(xì)方案設(shè)計,分析影響結(jié)構(gòu)部分的要求參數(shù)確定各個設(shè)計參數(shù)部分,使用層次分析法與專家法相結(jié)合確定特征權(quán)重,利于最近鄰法計算相似度,在檢索出相似的實例之后使用遺傳算法修改,最終形成滿足用戶要求的方案。在本文里對UG進(jìn)行二次開發(fā)將產(chǎn)品的輪廓特征表達(dá)出來,使用表達(dá)式驅(qū)動圖形模板進(jìn)行三維參數(shù)化建模,圖形的尺寸特征與表達(dá)式之間要相互依賴,能在實例推理結(jié)束后將實例推理得到的尺寸數(shù)據(jù)傳遞到表達(dá)式中,使表達(dá)式能夠驅(qū)動參數(shù)生成三維模型。本文在多層空間實例的分解基礎(chǔ)之上運(yùn)用遺傳算法與實例推理相結(jié)合實現(xiàn)數(shù)控車床的創(chuàng)新型方案設(shè)計然后進(jìn)行三維模型,這樣就可以模擬設(shè)計者的思維模式去設(shè)計避免過多的重復(fù)勞動、提高了設(shè)計效率。
[Abstract]:With the rapid development of machinery and equipment manufacturing parts are becoming more and more complicated, and the high accuracy of the machine tool industry has also put forward the requirements of high efficiency and high precision. If the machine tool wants to change, it must start with the design. The design of machine tools is the basis of the development of machine tools, so intelligent design machine tools is an important research direction. At the beginning of this paper, the general framework of intelligent design system is constructed, which is divided into space description of multi-level examples and numerical control lathe scheme design based on genetic algorithm. The detailed scheme design and 3D parameterized modeling of NC lathe based on case-based reasoning (CBR) should be analyzed and studied in this paper. Then, the function of each module is realized. The spatial description of multi-level examples is the basic part of the system. Firstly, the spatial decomposition of NC machine tools is done, and the complex examples are decomposed into each functional module. This makes it possible to determine the function of each module accurately in the design. When decomposing, we should analyze the correlation degree and decompose the NC lathe by function and structure. Its decomposition directly affects the performance of genetic algorithm and case-based reasoning system. Genetic algorithm and case-based reasoning system are the core of this paper. In the part of genetic algorithm system, the design requirements should be changed. The corresponding mathematical model is established as fitness function by analyzing each index, and then it is selected and crossed. After obtaining the basic scheme, we can get the further detailed scheme design that can meet the requirements of the scheme by case-based reasoning, and analyze the required parameters that affect the structural part to determine the design parameters. AHP and expert method are used to determine the feature weight, which is conducive to the nearest neighbor method to calculate the similarity. After retrieving similar examples, genetic algorithm is used to modify them. Finally form a solution to meet the requirements of users. In this paper, the second development of UG to express the contour features of the product, using expression driven graphics template for three-dimensional parametric modeling. The dimension feature of the graph depends on the expression and can transfer the dimension data of the case reasoning to the expression after the case reasoning is finished. The expression can drive the parameters to generate 3D model. In this paper, based on the decomposition of multi-layer spatial cases, genetic algorithm and case-based reasoning are used to realize the innovative scheme design of NC lathe and then carry out 3D model. In this way, the designer's thinking mode can be simulated to avoid too much duplication of work, and the design efficiency can be improved.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG502.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 陶善新,唐文獻(xiàn),李莉敏;基于知識驅(qū)動的產(chǎn)品開發(fā)系統(tǒng)研究與實現(xiàn)[J];計算機(jī)工程與應(yīng)用;2003年22期

2 于學(xué)軍;羅振璧;朱立強(qiáng);;公理設(shè)計中確定交互作用程度的方法[J];機(jī)械工程學(xué)報;2007年04期

3 郝博,胡玉蘭,盧有文,聶義勇;用遺傳算法解病態(tài)線性方程組的研究[J];計算機(jī)工程與設(shè)計;1998年03期

相關(guān)博士學(xué)位論文 前1條

1 邱明;語義相似性度量及其在設(shè)計管理系統(tǒng)中的應(yīng)用[D];浙江大學(xué);2006年

相關(guān)碩士學(xué)位論文 前2條

1 劉立明;基于規(guī)則和實例推理的智能化刀具CAD系統(tǒng)研究[D];西北工業(yè)大學(xué);2007年

2 杜偉明;基于實例推理的齒輪減速機(jī)三維CAD設(shè)計系統(tǒng)設(shè)計與實現(xiàn)[D];電子科技大學(xué);2012年

，

本文編號：1482335