一种新的故障树定性分析方法

提出基于割序集的分析方法以研究故障树顶事件发生时基本事件的动态行为。利用顺序失效符表示事件的顺序失效关系，并将静态门和动态门转化为顺序失效表达式来描述故障树中各种门的动态行为，利用顺序失效表达式构建故障树的割序集。结合实例阐述故障树割序集生成算法的流程。该算法将失效行为表示为长度小于系统中部件个数的有序部件序列，为研究故障树提供了一种新的定性分析方法。

Qualitative Analysis Approach for Fault Tree

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.