A New Bayesian Approach to Multiple Intermittent Fault Diagnosis

Abstract

Logic reasoning approaches to fault diagnosis account for the fact that a component may fail intermittently by introducing a parameter that expresses the probability the component exhibits correct behavior. This component parameter in conjunction with a priori fault probability, is usedin a Bayesian framework to compute the posterior fault candidate probabilities. Usually, information on is not known a priori. While proper estimation of can have a great impact on the diagnostic accuracy, at present, only approximations have been proposed. We present a novel framework, BARINEL, that computes exact estimations of as integral part of the posterior candidate probability computation. BARINEL's diagnostic performance is evaluated for both synthetic and real software systems. Our results show that our approach is superior to approaches based on classical persistent fault models as well as previously proposed intermittent fault models.Rui Abreu, Peter Zoeteweij, Arjan J.C. van Gemund