Analysis of Subjective Critical Importance Considered Synthetically Several Fault Trees

Abstract

FTA (Fault Tree Analysis) is used for reliability and safety analysis of system. In FTA, the critical importance is defined in order to control occurrence of top event effectively. In the case of consideration in two or more top events, it can be enough expected to the fault tree about top events that common fundamental events are contained. In this paper, we have proposed a method to estimate for critical importance synthetically for several fault trees. Furthermore, this method is applied to reliability analysis of small engine. Consequently, the priority which improve fundamental events contained in these fault trees become clear.