事故树结构重要度求解方法研究探讨

Study on solving method for structural importance of fault tree

在采用事故树法进行安全系统分析时,事故树的结构重要度一般是利用最小割集或最小径集进行求解,但是由于采用最小割集求解的结果与采用最小径集分析求得结果并不一致,使得事故树结构重要度产生差异,导致系统分析结果存在差异。本文提出采用求结构重要度系数和利用概率重要度性质求结构重要度的方法来解决,实例证明所求解的结构重要度结果与最小径集分析结果一致,结果精确。

When conducting safety system analysis by fault tree analysis, the structural importance of fault tree has usually been solved by minimum cut set or minimum path set. Due to the different results by minimum cut set and minimum path set analysis, the structural importance of fault tree will he differenced. Which lends to the diver- gence in system analysis results. The methods of calculating structural importance by solving structural importance coefficient and solving probability importance were put forward. The practical example proved that the solved results of structural importance was consistent with the results by minimum path set analysis, and the results were accurate.