基于实例的产品设计知识获取方法及实现

Case-Based Knowledge Acquisition of Product Design

现代产品设计是面向市场、功能驱动以及基于新知识的设计 ,而知识获取是关键步骤 .采用设计实例的形式对已有设计进行封装和组织 ,通过产品设计实例面向对象表达模型 ,将设计需求 (包括性能需求、环境约束和成本约束 )、设计任务、设计过程和设计方案封装在一个设计实例中 ,体现了功能驱动、面向市场的现代设计特征 .在此基础上 ,利用 Sybase公司的 Power Designer 8.0建模工具 ,进一步提出产品设计实例的获取模型 ,并对实例获取的关键技术进行了讨论 .以滑动轴承设计为工程应用背景 ,选择应用于涡轮机的四油叶径向滑动轴承为设计实例 ,详细描述了集成于 Solid Works2 0 0 0的滑动轴承设计实例获取模块的应用过程 ,验证了上述模型的正确性和可行性 .通过对设计实例进行表达、获取和存储 ,为后续的基于实例推理的产品设计方法打下基础 ,同时以对外提供功能的形式对并行设计环境下的功能检索提供支持 ,推动现代产品概念设计自动化进程 .

Modern product design is market-oriented, function-driven and novel knowledge-based. Focusing on its bottleneck, namely, the acquisition of experience knowledge, an object-oriented representation model of product design case is presented. The case instances encapsulate the design requirements (including the performance specification, environment constraints, cost limitation), design tasks, design processes, and design solutions, providing the comprehensive information for implementing a modern design system with capabilities of function-driven and agile response to market needs. Moreover, a knowledge acquisition model of design cases is developed on Sybase Power Designer 8.0, being able to inquire and retrieve the related design case. A prototype system of journal bearing design for turbo machinery is realized on SolidWorks 2000, using a four-lobe radial journal bearing as a design case to verify the feasibility and validity of the knowledge acquisition model. The work presented lays a usable foundation of case based design, gives support to functional retrieval in concurrent design environment, and promotes the automated conceptual design of modern products.