机构方案创新设计自动创成与装配构型分析研究

发布时间：2018-08-16 16:42

【摘要】：本文在分析总结当前计算机辅助机构方案创新设计的研究现状与存在的问题的基础上,以机构创新设计方案自动创成和装配构型自动求解及构型图谱绘制为目标,对方案创新设计自动创成理论、实现方法和关键技术以及方案装配构型分析模型建立求解、构型图谱绘制等方面进行了深入的研究探讨。主要研究工作如下: 从系统角度出发,探讨并分析了基于符号设计规则的机构方案创新设计基本理论,以此为基础,对基于符号设计规则的机构方案创新设计方法进行了完善和发展;重点对定向推理发散实现策略及计算机辅助方案自动创成具体实现进行了深入研究,据此,使复杂的方案设计过程转化为可计算机化的常规设计,通过将发散思维与创新设计过程简单化、系统化,使得方案设计过程模块化、程式化,从而降低了对设计人员的要求。针对发散推理操作过程中面临的方案解膨胀与冗余性难点问题,基于邻接矩阵中构件的拓扑特性与连接关系,本文对构件的相似性判别方法进行了合理的改进与完善,提出了一种构件相似性判别的计算机化方法,有效地避免了众多同构方案的产生,从而提高了方案推理的效率与综合结果的可靠性。基于生成的符号设计方案与机构桁架分析理论,提出了一种适于多杆多自由度复杂机构装配构型分析的通用方法。在对平面闭式机构运动链的拓扑特性分析的基础上,根据单杆转化原理,对装配构型分析中的两个关键问题—多杆基本刚性链链型结构自动识别以及装配构型分析情况的确定进行了研究,针对具体链型的分析情况建立了相应的运动学位置约束方程组,以此为基础解决了机构装配构型统一求解模型自动构建难题。针对不同链型的分析情况建立的统一运动学位置约束方程组的结构特点,结合相关数值计算理论方法及应用,提出了采用基本同伦法与系数同伦法相结合的模式对平面机构装配构型数学模型进行自动求解,该方法可高效地获得考虑全部运动构件的机构的所有可能构型,有效解决了平面机构装配构型的多解性,为正确地绘制机构构型图谱奠定了基础。基于以上理论研究成果,在Windows系统环境下,利用高级程序开发语言VB 6.0和Solid Edge二次开发技术编制了计算机辅助机构方案创新设计程序。并结合已有的工作基础给出了应用实例,对前述章节理论方法和程序进行了验证。
[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.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH112

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