馬嵐，王厚軍 （電子科技大學自動化工程學院，四川 成都 610054）   摘要：基于知識的故障診斷專家系統在應用時面臨知識獲取、知識表達和知識與診斷推理有機融合等幾方面的困難。本文論述了一種使用表達式解析的故障診斷方法，并將其用于某型雷達系統的故障診斷保障系統中。該方法將知識表示為邏輯表達式，推理機使用表達式解析的方法推理知識。使用該方法，知識的獲取和更新更加方便，并且推理機和表達式相互獨立，具有相當的通用性。 關鍵詞：故障診斷專家系統；表達式解析；知識獲取；知識更新；診斷推理   中圖分類號：TP333.7 文獻標識碼：A 文章編號：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