刚柔混合型产品的装配序列规划研究

发布时间：2018-02-03 08:35

本文关键词： 装配序列规划刚柔混合产品碰撞检测装配建模分散搜索算法　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：装配序列规划是产品研发过程中的最后阶段,合理且优化的产品装配序列可以显著的减少产品研发周期,提高装配质量,降低装配成本。随着科技的进步,越来越多的现代机电产品,除包含刚性零件以外,还有一些柔性零件。对于这类刚柔混合产品,现有的装配规划方法很难规划出一个合理可行的装配序列。本文针对刚柔混合产品装配序列规划的特点及其目前存在的问题上,探讨研究了碰撞干涉检测技术和刚柔混合产品的装配模型,并以此为基础提出了刚柔混合产品装配序列规划的解决方案。碰撞检测技术是装配序列规划问题的重要组成部分,快速高效的检测零件之间的碰撞是碰撞检测的难点和重点。论文分析研究了干涉领域的包围盒技术、粗略碰撞检测技术、基于包围盒十字相交的干涉判断等方法,这些方法是装配序列规划过程中干涉矩阵提取的基础。产品装配信息建模是实现装配规划的基础,装配信息的完整和准确地表示以及管理是实现高效装配序列规划的前提条件。装配信息建模是对零件信息、工具信息等装配信息进行管理,并对初始设计模型的信息进行提取和重新组织,建立一套完整可靠的信息数据模型,为后续的装配序列规划工作提供必要的数据准备和支持。在解决刚柔混合型产品装配序列规划方面,论文首先根据装配干涉矩阵在装配领域的应用提出并定义了装配应力矩阵的概念,并通过装配应力矩阵将零件之间的干涉情况进行数字化。采用有限元的方法模拟刚性零件和柔性零件以及两柔性零件之间的装配过程,记录装配过程中的最大应力并判断是否超过该零件的屈服应力,以此作为判断具有柔性零件的装配是否干涉的依据。其次本文重新设计了对应于装配应力矩阵的分散搜索算法,给出了解的表达方式,以装配方向的改变次数和总的最大应力次数作为目标函数并给出了其计算方法。设计了初始解的多样化生成方法和解的提高方法,给出了参考集的选择、更新、子集的产生方式。结合实例列出了部分交叉、有序交叉、两点交叉的重组方式。在参数的选择上采用了田口方法和TOPSIS法相结合,根据参数类型以及水平数列出了试验的正交矩阵,然后确定最优参数值。最后结合实例验证了装配应力矩阵在解决刚柔混合产品序列规划的可行性以及分散搜索算法的高效性。
[Abstract]:Assembly sequence planning is the last stage in the process of product development. Reasonable and optimized product assembly sequence can significantly reduce product development cycle, improve assembly quality and reduce assembly cost. More and more modern mechanical and electrical products, in addition to the rigid parts, there are some flexible parts. For this kind of rigid and flexible hybrid products. It is very difficult for the existing assembly planning methods to plan a reasonable and feasible assembly sequence. This paper aims at the characteristics of the assembly sequence planning of rigid and flexible mixed products and the existing problems. The collision interference detection technology and the assembly model of rigid and flexible products are studied. On this basis, a solution to assembly sequence planning of rigid and flexible mixed products is proposed. Collision detection is an important part of assembly sequence planning. It is difficult and important to detect collision between parts quickly and efficiently. The bounding box technology and rough collision detection technology in the field of interference are analyzed and studied in this paper. Based on bounding box cross interference judgment and other methods, these methods are the basis of interference matrix extraction in assembly sequence planning. Product assembly information modeling is the basis of assembly planning. The complete and accurate representation and management of assembly information is a prerequisite for efficient assembly sequence planning. Assembly information modeling is the management of assembly information such as part information and tool information. The information of the initial design model is extracted and reorganized, and a set of complete and reliable information data model is established. To provide necessary data preparation and support for subsequent assembly sequence planning. Firstly, according to the application of assembly interference matrix in assembly field, the concept of assembly stress matrix is proposed and defined. The interference between parts is digitized by assembly stress matrix, and the assembly process between rigid parts, flexible parts and two flexible parts is simulated by finite element method. Record the maximum stress during assembly and determine whether it exceeds the yield stress of the part. This is used as the basis for judging whether the assembly of flexible parts interfere. Secondly, this paper redesigns the decentralized search algorithm corresponding to assembly stress matrix, and gives the expression of the solution. Taking the changing times of assembly direction and the total maximum stress times as the objective function, the calculation method is given. The method of multiplicity generation of initial solution and the improvement method are designed, and the selection and update of reference set are given. The generation of subsets. Combined with examples listed partial crossover, ordered crossover, two-point crossover recombination. In the selection of parameters using the Taguchi method and TOPSIS method combined. The orthogonal matrix of the experiment is given according to the type of parameters and the horizontal number. Finally, the feasibility of assembly stress matrix in solving the sequence planning of rigid-flexible mixed products and the efficiency of decentralized search algorithm are verified.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG95;TP18

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