【作者】 贺鹏；

【导师】 李庆芬；

【作者基本信息】 哈尔滨工程大学 ， 机械设计及理论， 2005， 硕士

【摘要】 本论文工作开发了一个基于Web的疲劳断裂理论的工程应用专家系统。该专家系统的基本功能是将疲劳断裂理论知识运用于几种工程典型构件的分析与设计之中,并且得出综合评价结果。它的主要任务是对组合气缸、压力容器、旋转构件进行COD理论和J积分理论的评定,以及对大型铸锻构件进行断口形貌转变温度FATT的评定。 为此,我们对疲劳断裂设计理论中相关的大量领域知识、专家经验与设计方法进行了归纳总结,为系统内所有构件分块建立了相应的知识库和数据库,而且建造了管理与维护它们的子系统;同时,还构造了一个比较通用的推理机和一套跟踪解释机制,确保了推理过程的透明度和推理结论的可信度;此外,设计了一个比较可靠的扩充接口,这个接口能够帮助用户创建新增构件所需的知识库和数据库,并把它们按照系统的内部编制要求自动存储于系统之中,从而使本专家系统成为可继续扩展的开放系统;另外,为系统设计了自然友好的界面,其操作简单方便,并提供在线帮助功能。 整个系统为B/S框架,具有良好的人机交互界面。程序实现采用了Microsoft Visual Studio.net的编程技术,便于调试、维护及移植。更多还原

【Abstract】 A Web-based Expert System for Engineering Application of Fatigue and Fracture Theory was developed in this paper. Its essential function is to apply the theory of fatigue and fracture to the design and analysis of several typical engineering components, and obtain the comprehensive appraised result in the end. The main task of the system is to assess assembled vats, pressure vessels and rotation components by using COD and J-integral theory, and to assess large casting and forging components by FATT theory.A great deal of knowledge, experience, and methods for these typical engineering components’ design are collected, and knowledge bases, data bases are built respectively. A data base management system is also established in the system. The system includes a general inference engine and a set of track and explanation mechanism, which guarantee the inferring process visible and the inferred conclusion convincible. In addition, the system has a comparatively reliable expanded interface, which can assist user to add new components to the ES. Therefore, the ES is an open system, which can be expanded and enlarged through modifying and filling the databases. It has a natural and friendly interface, which can be easily operated. A help service on the line is also provided.The whole system is a B/S prototype with a nicer interactive interface. Programming technologies of Microsoft Visual Studio.net are adopted for program actualizing. This makes it convenient for debugging, maintenance and transplanting.更多还原