可变功能机械功能设计及功能转换过程研究

发布时间：2018-06-16 14:37

本文选题：可变功能 + 模块化设计　；参考：《宁波大学》2017年硕士论文

【摘要】：可变功能机械产品相对于一般同类型的机械产品有比较明显的优势,如适用范围广、结构紧凑、功能可拓展,因此进行可变功能机械产品创新设计,或者对一般的机械产品进行可变功能设计,均具有较为重要的研究价值。目前相关工作还较少。本文从两个方面开展研究,其一是对机械产品的功能模块划分、功能结构相似性进行了分析探讨,以辅助实现可变功能设计机械产品的设计开发;其二是对可变功能产品的拆卸与装配顺序进行了研究,为实现可变功能机械产品的高效功能转换提供参考。具体包括:首先,对功能、功能分类及功能分解进行了介绍,并将功能分为分支功能、导向功能、连接功能、控制大小功能、转换功能、供应功能、信号功能、支持功能等八大类。然后介绍了功能链的创建及组合方法,并结合有向图,将建立的功能结构模型转换为赋权有向图,得到功能结构模块的可达性矩阵,通过可达性矩阵得到各链的可达性,从而判断功能模块的组成。通过实例验证了所提出的方法。其次,通过综合已有的概念设计方法,结合可变功能的性质,给出了一种适用于可变功能机械的功能设计方法。通过产品的功能结构、功能模块分析比较,发现不同产品在不同程度上都具有一定的相似性,并进而给出了功能相似性的定义。借助层次分析法的思想建立了功能相似度评价模型,用来评价产品的相似性程度。以电风扇与吹风机为例来验证上述方法,最终得到的综合评价结果验证了功能相似性定量描述的可行性,并且以两产品各对应功能模块的相似度为可变功能产品的设计开发提供了一定的设计判断与决策依据。最后,为了更加快速、高效地实现可变功能机械各功能之间的转换,对该转换过程中涉及的零件拆卸-装配序列进行了研究。通过子拆卸体识别来降低生成拆卸序列的复杂性,用零部件支撑矩阵以确保拆卸稳定性。提出基于多方向路径判断方法的改进干涉矩阵和基于包围盒-投影干涉检测生成的集合干涉矩阵。然后,基于改进干涉矩阵,通过信息搜索、矩阵简化方法获取拆卸序列;基于集合干涉矩阵,借助遗传算法获取优化拆卸序列。两种方法均用实例验证了可行性。
[Abstract]:The variable function mechanical products have obvious advantages over the general mechanical products of the same type, such as wide range of application, compact structure and extensible functions, so the innovative design of variable function mechanical products is carried out. Or to the general mechanical product variable function design, all have the more important research value. At present, the relevant work is still relatively small. In this paper, two aspects of research are carried out. One is to analyze and discuss the functional module division and the similarity of functional structure of mechanical products in order to realize the design and development of mechanical products with variable function. The second is to study the disassembly and assembly sequence of variable function products, which provides a reference for the realization of efficient functional conversion of variable function mechanical products. It includes: firstly, the function, function classification and function decomposition are introduced, and the functions are divided into branch function, guide function, connection function, control function, conversion function, supply function, signal function. Support functions and other eight categories. Then, the creation and combination method of functional chain are introduced, and the function structure model is transformed into weighted directed graph, and the reachability matrix of functional structure module is obtained, and the reachability of each chain is obtained by reachability matrix. Thus the composition of the function module is judged. An example is given to verify the proposed method. Secondly, by synthesizing the existing conceptual design methods and combining the properties of variable functions, a functional design method suitable for variable function machinery is presented. Through the analysis and comparison of the function structure and function module of the product, it is found that different products have certain similarity in different degree, and the definition of function similarity is given. The function similarity evaluation model is established with the idea of analytic hierarchy process (AHP), which is used to evaluate the similarity degree of products. Taking electric fans and hair dryers as examples to verify the above methods, the final comprehensive evaluation results verify the feasibility of quantitative description of functional similarity. And the similarity of each functional module of the two products provides a certain basis for the design and decision of the variable function product design and development. Finally, in order to realize the conversion between the functions of the variable function machinery more quickly and efficiently, the disassembly and assembly sequence of the parts involved in the conversion process is studied. The complexity of generating disassembly sequence is reduced by subdisassembly recognition, and the component support matrix is used to ensure the disassembly stability. An improved interference matrix based on multidirectional path judgment and a set interference matrix based on bounding box and projection interferometric detection are proposed. Then, based on the improved interference matrix, the disassembly sequence is obtained by the method of information searching, and the optimal disassembly sequence is obtained by genetic algorithm based on the set interference matrix. The feasibility of both methods is verified by an example.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH122

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