Qualitative Analysis Approach for Fault Tree
Dong Liu · Jisuanji gongcheng · 2008
In order to investigate the dynamic behaviors of basic events in fault trees, a new method based on Cut Sequence Set(CSS) is presented. Cut sequence includes a set of basic events that induce their top events, and the basic events in a cut sequence fail in a fixed order. CSS is the set of all cut sequences of a fault tree. The paper defines Sequential Failure Symbol(SFS) to describe the sequential failure of events. SFS is used to translate static gates and dynamic gates into Sequential Failure Expressions(SFE), which represents the sequential behaviors of the events in these gates. The failure of top event is described by some SFEs, namely cut sequences, which constitute CSS. A CSS generation algorithm is put forward, and an example illustrates the application and advantages of the method. The approach represents system failure behaviors by using a sequence with some components, which provides a new qualitative analysis approach to study fault trees.