【作者】 徐勇；

【导师】 廖文和；

【作者基本信息】 南京航空航天大学 ， 航空宇航制造工程， 2005， 硕士

【摘要】 与国外跨国公司相比,我国工程机械生产企业在新产品研制方面存在自主创新能力差,产品开发周期长、成本高、可靠性低等问题,导致这些问题的重要原因在于企业用于产品开发的设计理念较落后,缺乏有效的且适合企业特点的设计工具。在国家高技术计划(863)、江苏省高科技项目的资助下,课题组开展了对支持工程机械快速设计的工具集和专用系统的研究,课题组在充分调研国内工程机械企业设计共性需求的基础上,结合先进的设计理念和三维 CAD 技术,研究并开发了面向工程机械产品研制的快速设计系统,本文的研究作为该课题的一个重要组成部分进行了以下几方面的工作。 首先,对产品的开发方法和技术进行了总结和概括,分析了我国工程机械行业产品设计的现状和发展趋势,提出将基于案例的设计方法(Case BasedReasoning,CBR)应用在工程机械产品的设计中;其次,结合工程机械产品的特点,研究了 CBR 技术的原理和关键技术,主要包括 CBR 的设计流程、案例的表示/检索/修正/学习/维护等;再次,通过建立扩展对象模型实现了对工程机械产品的设计案例完整信息的表示和存储,并结合基于装配分解的层次树索引构建了工程机械产品案例库;然后,重点研究了面向工程机械案例库的案例检索以及推理算法,提出并实现了一种能够满足基于装配关系约束的基本数据、复合数据以及案例对象的相似度计算方法;最后,应用以上研究成果,结合镇江华晨华通路面机械厂的水泥摊铺机产品,在 CAXA 三维实体设计平台上开发了基于 CBR 的工程机械快速设计原型系统,该系统不仅通过了软件测试,并且在实践中取得了预期的效果。更多还原

【Abstract】 Compared with some famous trans-corporations, domestic manufacturingenterprises of construction machinery have some problems in the process of newproduct developments (e.g., deficient independent innovation ability, longdevelopment cycle, high costs and etc). These problems can mainly be ascribed tooutdated design concept and a lack of an effective and suitable design tools. Aided bynational Hi-Tech technology project (863) and the Hi-Tech project of Jiangsuprovince, and based on a sufficient investigation and research on the demands of theenterprises, our team had developed completely a rapid design system for constructionmachinery products with advanced design theory and 3D CAD technologies. As animportant component of the above studies, the thesis has finished as followings: Firstly, rapid product development methods and technologies were summarized,and domestic actuality and trend of construction machinery product design wereanalyzed, and a design method based on CBR (case based reasoning) was put forwardto apply to construction machinery products design. Secondly, according to thecharacteristics of construction machinery products, principle and key technologies ofCBR were studied, including the design process based on CBR, andexpression/retrieve/revise of cases and etc. Thirdly, through constructed extendedobject model, expression and storage of full information of construction machineryproduct cases were realized, and according to a hierarchy tree index based onassemble, a case database of the products was built. Then, the searching methods ofconstruction machinery product cases and its reasoning algorithm are emphasized inthe thesis, and an algorithm was brought forward, which could give a satisfying resultas calculating the similitude among basic data type, compound data type and caseobjects based on assemble constraints. Finally, according to the results above, a rapiddesign prototype system based on CBR for construction machinery was developedcompletely on CAXA solid platform, and it has been applied to concrete pavingmachine design in Zhenjiang Huachen Huatong Road Machinery Co, Ltd. The systemnot only passed a third party software test, but also rewarded in practice asanticipated.更多还原