节点文献
组合夹具计算机辅助构形设计中基于案例的推理方法的研究
Research on the Application of Case-Based Reasoning in Computer-Aided Fixture Configuration Design
【作者】 李翠玉;
【导师】 段国林;
【作者基本信息】 河北工业大学 , 机械制造及其自动化, 2003, 硕士
【摘要】 高柔性的组合夹具已成为现代制造系统的必备辅助手段,但至今尚未出现十分成熟的商品化组合夹具计算机辅助设计软件。随着人工智能技术的飞速发展,设计者开始把其引入到组合夹具计算机辅助设计系统中,但由于组合夹具问题的复杂性,结果并不是特别理想。 基于案例推理(Case-Based Reasoning,CBR)作为人工智能由表层的机器模仿向深层的机器思维发展中的一种形式已得到认知科学和人工智能研究者越来越多的重视。CBR是利用以往求解类似问题的以事例形式表示的经验知识进行推理,从而获得当前问题求解结果的一种推理模式,因此,对CBR的深入研究有助于探讨人类求解问题和学习新知识的机制;有助于解决专家系统中知识的难于获取和推理的脆弱性等问题;有助于对不完全了解的领域,根据以往的经验做出某些假设和推测,从而帮助解决所面临的问题;有助于在没有有效算法时求得问题的解。 组合夹具构形设计是指夹具的组合拼装设计。本文将基于案例推理的方法引入组合夹具构形设计中,使组合夹具计算机辅助构形设计系统增加智能,更方便用户使用。主要研究基于案例的推理方法在组合夹具计算机辅助构形设计中的应用,包括构形设计经验的表达、案例的检索与匹配等。本文主要做了以下工作: (1)在和组装工人探讨的基础上制定了典型结构的内涵,并将典型结构组织到案例库中; (2)利用Microsoft Access构建组合夹具和典型结构案例库; (3)根据本应用的具体要求,提出了将深度优先搜索方法应用到案例检索当中; (4)建立了一个应用CBR技术进行组合夹具计算机辅助设计的系统。
【Abstract】 The high flexible fixture has been an imperatively accessorial means of modern manufacturing system, but there has not appeared very maturely commercial Computer-Aided Fixture Design software as yet. With the fast development of Artificial Intelligence (AI), the designers introduce it to the Computer-Aided Fixture Design system, but they aren’t very useful for the problematic complexity of the modular fixture.The Case-Based Reasoning (CBR) that has developed from the skin-deep machine imitation to the deep-seated machine thinking technology has already been attached more importance by the cognitive science and AI researchers. Because CBR carries through the ratiocination with the experience knowledge that is expressed as the case on the base of the customary case, the profound research of CBR redounds to discussing the mechanism by which human resolve the problem and study new knowledge, to resolving the knowledge which is difficult to obtain and the fragility of the reasoning in the expert system, to making the hypothesis and presume on the base of the primary experience in the undiscovered areas to help to resolve the problem, and to seeking out the answer when we have no effective arithmetic.The modular fixture configuration design means the fixture combined assembling design. In this paper, CBR is introduced to the computer-aided fixture configuration design system in order to make the design system more intelligent and more convenient for the user. This paper introduces the application of CBR in Computer-Aided Fixture Design, including the expression of configuration design, searching and matching of case etc. This paper mainly does the following work:(1) Bringing forward the concept of special structure on the base of the discussion with the assembling workers and putting the special structure into the case warehouse;(2) Constructing the case warehouse of the modular fixture and special structure on the base of Microsoft Access;(3) Bringing forward the method on the base of Depth Firstly Searching (DPS) in case searching;(4) Constructing the Computer-Aided Fixture Design system on the base of CBR.
【Key words】 modular fixture; computer-aided design; case-based reasoning; artificial intelligence; expert system; special structure;
- 【网络出版投稿人】 河北工业大学 【网络出版年期】2003年 04期
- 【分类号】TG75
- 【被引频次】13
- 【下载频次】287