【摘要】：本文在分析總結(jié)當(dāng)前計(jì)算機(jī)輔助機(jī)構(gòu)方案創(chuàng)新設(shè)計(jì)的研究現(xiàn)狀與存在的問題的基礎(chǔ)上,以機(jī)構(gòu)創(chuàng)新設(shè)計(jì)方案自動創(chuàng)成和裝配構(gòu)型自動求解及構(gòu)型圖譜繪制為目標(biāo),對方案創(chuàng)新設(shè)計(jì)自動創(chuàng)成理論、實(shí)現(xiàn)方法和關(guān)鍵技術(shù)以及方案裝配構(gòu)型分析模型建立求解、構(gòu)型圖譜繪制等方面進(jìn)行了深入的研究探討。主要研究工作如下: 從系統(tǒng)角度出發(fā),探討并分析了基于符號設(shè)計(jì)規(guī)則的機(jī)構(gòu)方案創(chuàng)新設(shè)計(jì)基本理論,以此為基礎(chǔ),對基于符號設(shè)計(jì)規(guī)則的機(jī)構(gòu)方案創(chuàng)新設(shè)計(jì)方法進(jìn)行了完善和發(fā)展;重點(diǎn)對定向推理發(fā)散實(shí)現(xiàn)策略及計(jì)算機(jī)輔助方案自動創(chuàng)成具體實(shí)現(xiàn)進(jìn)行了深入研究,據(jù)此,使復(fù)雜的方案設(shè)計(jì)過程轉(zhuǎn)化為可計(jì)算機(jī)化的常規(guī)設(shè)計(jì),通過將發(fā)散思維與創(chuàng)新設(shè)計(jì)過程簡單化、系統(tǒng)化,使得方案設(shè)計(jì)過程模塊化、程式化,從而降低了對設(shè)計(jì)人員的要求。 針對發(fā)散推理操作過程中面臨的方案解膨脹與冗余性難點(diǎn)問題,基于鄰接矩陣中構(gòu)件的拓?fù)涮匦耘c連接關(guān)系,本文對構(gòu)件的相似性判別方法進(jìn)行了合理的改進(jìn)與完善,提出了一種構(gòu)件相似性判別的計(jì)算機(jī)化方法,有效地避免了眾多同構(gòu)方案的產(chǎn)生,從而提高了方案推理的效率與綜合結(jié)果的可靠性。 基于生成的符號設(shè)計(jì)方案與機(jī)構(gòu)桁架分析理論,提出了一種適于多桿多自由度復(fù)雜機(jī)構(gòu)裝配構(gòu)型分析的通用方法。在對平面閉式機(jī)構(gòu)運(yùn)動鏈的拓?fù)涮匦苑治龅幕A(chǔ)上,根據(jù)單桿轉(zhuǎn)化原理,對裝配構(gòu)型分析中的兩個關(guān)鍵問題—多桿基本剛性鏈鏈型結(jié)構(gòu)自動識別以及裝配構(gòu)型分析情況的確定進(jìn)行了研究,針對具體鏈型的分析情況建立了相應(yīng)的運(yùn)動學(xué)位置約束方程組,以此為基礎(chǔ)解決了機(jī)構(gòu)裝配構(gòu)型統(tǒng)一求解模型自動構(gòu)建難題。 針對不同鏈型的分析情況建立的統(tǒng)一運(yùn)動學(xué)位置約束方程組的結(jié)構(gòu)特點(diǎn),結(jié)合相關(guān)數(shù)值計(jì)算理論方法及應(yīng)用,提出了采用基本同倫法與系數(shù)同倫法相結(jié)合的模式對平面機(jī)構(gòu)裝配構(gòu)型數(shù)學(xué)模型進(jìn)行自動求解,該方法可高效地獲得考慮全部運(yùn)動構(gòu)件的機(jī)構(gòu)的所有可能構(gòu)型,有效解決了平面機(jī)構(gòu)裝配構(gòu)型的多解性,為正確地繪制機(jī)構(gòu)構(gòu)型圖譜奠定了基礎(chǔ)。 基于以上理論研究成果,在Windows系統(tǒng)環(huán)境下,利用高級程序開發(fā)語言VB 6.0和Solid Edge二次開發(fā)技術(shù)編制了計(jì)算機(jī)輔助機(jī)構(gòu)方案創(chuàng)新設(shè)計(jì)程序。并結(jié)合已有的工作基礎(chǔ)給出了應(yīng)用實(shí)例,對前述章節(jié)理論方法和程序進(jìn)行了驗(yàn)證。
[Abstract]:On the basis of analyzing and summarizing the current research status and existing problems of computer aided mechanism scheme innovation design, this paper aims at automatic generation of mechanism innovative design scheme, automatic solution of assembly configuration and drawing of configuration map. In this paper, the theory of automatic generation of scheme innovation design, the realization method and key technology, the establishment and solution of scheme assembly configuration analysis model, and the drawing of configuration map are deeply studied and discussed. The main research work is as follows: from the point of view of system, this paper discusses and analyzes the basic theory of innovative design of mechanism scheme based on symbolic design rules. The innovative design method of mechanism scheme based on symbolic design rules is improved and developed, and the implementation strategy of directional reasoning divergence and the realization of computer-aided scheme automatic generation are studied in detail. By simplifying and systematizing the process of divergent thinking and innovative design, the process of scheme design is modularized and programmed, thus reducing the requirement for designers. In view of the difficult problem of solution expansion and redundancy in the process of divergent reasoning operation, based on the topological characteristic and connection relation of component in adjacent matrix, this paper improves and perfects the method of judging the similarity of component reasonably. In this paper, a computerization method for judging the similarity of components is proposed, which effectively avoids the generation of many isomorphism schemes and improves the efficiency of scheme reasoning and the reliability of synthetic results. Based on the generated symbolic design scheme and the theory of mechanism truss analysis, a general method for assembly configuration analysis of multi-bar and multi-degree-of-freedom complex mechanisms is proposed. Based on the analysis of the topological characteristics of the kinematic chain of the planar closed mechanism, according to the principle of single bar transformation, In this paper, two key problems in assembly configuration analysis-automatic identification of multi-bar basic rigid chain structure and determination of assembly configuration analysis are studied. The kinematic position constraint equations are established for the analysis of specific chain types, and the problem of automatic construction of the unified solution model of mechanism assembly configuration is solved on the basis of the equations. According to the structural characteristics of the unified kinematic position constraint equations established for the analysis of different chain types, combined with the related numerical calculation theory and its application, In this paper, a model combining the basic homotopy method and the coefficient homotopy method is proposed to solve the mathematical model of the assembly configuration of planar mechanism automatically. This method can efficiently obtain all possible configurations of the mechanism considering all moving members. The multi-solution of assembly configuration of planar mechanism is solved effectively, which lays a foundation for correctly drawing the profile of mechanism configuration. Based on the above theoretical research results, under the environment of Windows system, the computer aided mechanism scheme innovation design program is compiled by using the advanced programming language VB 6.0 and Solid Edge secondary development technology. An application example is given on the basis of the existing work, and the theoretical methods and programs mentioned above are verified.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH112

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