Study　on　Fault　Diagnostic　System　using　Modularized　Knowledge

Abstract

This　paper　presents　a　new　method　applying　knowledge　engineering　technique　to　develop　fault　diagnostic　system．This system　consists　of　the　knowledge　base　and　the　inference　engille．Chemical　plant　consists　many　components　which　are　pump，valve　and　so　on．The　knowledge　of　these　component　malfunctions　can　commonly　be　utilized　for　various　plants．Causal relationships　between　process　variables　and　failure　mode　for　various　components　are　darified　and　described　as　component flow　graph、Process flow　graph，which　each　component　How　graphs　are　lillked，stored　in　the　knowledge　base．This　system diagnoses　any　malfunctions　in　the　plant　by　searching　the　knowledge　base，This　proposed　diagnostic　system　has　the　facility for　correcting　and　changing　knowledge　base． A　pilot　plant　is　used　to　demonstrate　the　eflectiveness　of　the　proposed　method．