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建立专家系统是进行现代工程体系设计的一个重要手段。作为能代替专家完成一个复杂问题的综合分析与决策过程的专家程序系统,应该有一个严密的理论基础。本文建议把专家系统定义为五元组:ES={I,DB,RM,IM,C}并对专家系统的组成和工作情况进行了分析和研究。首先提出了专家系统的因素关系树的概念及其求法,并以该树的截断集的概念使数据库的应用更为灵活方便,为此还给出了数据库模块的分解和构成的方法。在此基础上用识别和评价规则组成了识别器。最后,通过构造逻辑综合关系的模糊运算规则集合与物理综合关系的模糊运算规则集合,得到能从数据库出发推出最终结论的推理机。
Establishing expert system is an important means to design modern engineering system. As an expert program system that can replace the expert to complete a comprehensive analysis and decision-making process for complex issues, there should be a rigorous theoretical basis. This paper proposes to define the expert system as quintuple: ES = {I, DB, RM, IM, C}. The composition and workings of the expert system are analyzed and studied. First of all, the concept of the relational tree of the expert system and its solution are put forward, and the application of the database is more flexible and convenient by the concept of the truncation set of the tree. To this end, the method of decomposing and constructing the database module is also given. On this basis, the recognition and evaluation rules form a recognizer. Finally, by constructing the set of fuzzy operation rules of the set of fuzzy operation rules and the physical relationship of the logical comprehensive relationship, an inference engine that can deduce the final conclusion from the database is obtained.