基于可拓实例推理的起重机械装配序列规划系统研究

发布时间：2018-04-26 22:20

本文选题：起重机械 + CBR　；参考：《浙江工业大学》2012年硕士论文

【摘要】：计算机辅助装配工艺规划(CAAPP)一直是装配工艺研究的一个重要内容。随着起重机械数字化制造工程的发展,由于起重机械的复杂性,如何开发起重机械装配工艺设计的智能系统,同时提高起重机械装配工艺设计的效率成为了起重机械行业中迫切需要解决的问题之一。本文针对这一问题,以起重机零部件装配序列规划为研究对象,提出构建基于实例推理的起重机械装配序列规划系统的设想,对装配知识的获取、推理、管理及应用等方面进行了研究,开发了相应的原型系统。论文的主要研究内容如下： 1.根据目前起重机械制造业的数字化装配工艺规划现状,构建了基于实例推理的起重机械装配序列规划系统的基本框架,确定由Oracle XML DB作为装配实例库的底层支撑数据库,设计了基于可拓实例推理模块与基于知识的冲突消解模块,并给出了实例库完善方法； 2.结合起重机械的装配结构特征,建立了基于可拓知识的装配模型与基于可拓距的相似度计算模型,提出了一种基于可拓关系的装配模块划分方法,并将其应用于双梁桥式起重机的小车。 3.研究了针对起重机械的装配实例表示方式与实例组织结构,在分析了起重机械的装配结构特征之后,为起重机装配实例库构建了索引机制,并给出了起重机装配特征获取方案与检索和限制策略。研究了基于可拓知识的相似度计算模型的检索功能,并将Delphi法与AHP法应用于权值确定方法； 4.综合论文对起重机械装配序列规划系统的理论研究,开发了基于实例推理技术的起重机装配序列规划系统,实现了起重机械装配序列规划系统的智能化集成,以双梁桥式起重机主梁为例进行了应用,并与基于优先关系的规划方法进行了比较。 5.最后对全文进行了总结,并对论文的进一步研究进行了展望。
[Abstract]:Computer aided assembly process planning (CAAPP) has been an important part of assembly process research. With the development of the digital manufacturing engineering of hoisting machinery, how to develop the intelligent system of assembly process design for hoisting machinery, due to the complexity of hoisting machinery, At the same time, improving the efficiency of assembly process design of hoisting machinery has become one of the urgent problems to be solved in hoisting machinery industry. Aiming at this problem, this paper takes the assembly sequence planning of crane parts as the research object, and puts forward the idea of constructing the assembly sequence planning system of crane machinery based on case-based reasoning, the acquisition and reasoning of assembly knowledge. The management and application are studied and the corresponding prototype system is developed. The main contents of this thesis are as follows: 1. According to the present situation of digital assembly process planning in hoisting machinery manufacturing industry, the basic framework of assembly sequence planning system of lifting machinery based on case-based reasoning is constructed, and Oracle XML DB is selected as the underlying support database of assembly case library. The extension based case reasoning module and the knowledge based conflict resolution module are designed, and the method to improve the case base is given. 2. According to the characteristics of assembly structure of hoisting machinery, the similarity calculation model based on extension distance and extension knowledge is established, and an assembly module partition method based on extension relation is proposed. It is applied to the trolley of double girder bridge crane. 3. This paper studies the assembly case representation and case organization structure of crane. After analyzing the characteristics of assembly structure of crane, the indexing mechanism is constructed for the assembly case library of crane. The method of obtaining crane assembly feature and the strategy of retrieval and restriction are also given. The retrieval function of similarity calculation model based on extension knowledge is studied, and the Delphi and AHP methods are applied to the weight determination method. 4. In this paper, a crane assembly sequence planning system based on case-based reasoning is developed, and the intelligent integration of crane assembly sequence planning system is realized. This paper takes the main girder of double girder bridge crane as an example and compares it with the planning method based on priority relation. 5. Finally, the thesis is summarized and the further research is prospected.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH21;TP391.72

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