马岚，王厚军 （电子科技大学自动化工程学院，四川 成都 610054）   摘要：基于知识的故障诊断专家系统在应用时面临知识获取、知识表达和知识与诊断推理有机融合等几方面的困难。本文论述了一种使用表达式解析的故障诊断方法，并将其用于某型雷达系统的故障诊断保障系统中。该方法将知识表示为逻辑表达式，推理机使用表达式解析的方法推理知识。使用该方法，知识的获取和更新更加方便，并且推理机和表达式相互独立，具有相当的通用性。 关键词：故障诊断专家系统；表达式解析；知识获取；知识更新；诊断推理   中图分类号：TP333.7 文献标识码：A 文章编号：1672-4984(2006)04-0029-04   General fault diagnostic expert system based on expression parsing   MA Lan，WANG Houjun (School of Automation Engineering，University of Electronic Science and Technology,Chengdu 610054,China)   Abstract: The study and application of knowledge-based fault diagnostic expert system has such difficulty with knowledge acquisition, knowledge representation and merger knowledge with diagnostic reasoning. This paper introduces a kind of new method based on expression parsing which has been used in radar automation test system. This method represents knowledge with the logic expression, then reasoning engine works with expression parsing. In this way knowledge acquisition and update is easier, and the reasoning is more general. Normally ,new fault diagnostic expert system will be got by little modification.   Key words：Fault diagnostic expert system；Expression parsing；Knowledge acquisition；Knowledge representation；Diagnostic reasoning