Method for solving structure importance degree of improved fault tree

Abstract

The invention provides a method for solving the structural importance of an improved fault tree, which comprises the following steps: 1. First, find the minimum cut and path set of the fault tree, and then use the "four-principle comparison method" to find the fault tree based on The structural importance of the minimum cut set and the minimum path set are compared, and if the values ​​are the same, it means that the structural importance obtained by solving is correct, which is the final result. 2. If the sizes are inconsistent, it means that there is an error in the calculated structural importance. At this time, if the number of basic events in the minimum cut set and the minimum path set. If the number of basic events is small, use the "nine principles comparison method" to correct the structural importance error; if the number of basic events is large, use the "mathematical combination verification method" to correct the structural importance error.

Description

technical field [0001] The invention relates to the field of qualitative analysis of fault trees, in particular to an improved method for solving the structural importance of fault trees Background technique [0002] The fault tree analysis method is a commonly used method in system safety analysis, and judging the importance of the accident structure is one of the indispensable methods in the qualitative analysis of the fault tree. The tree structure importance coefficient and the "four-principle comparison method", the calculation of the accident tree structure importance coefficient is accurate, but the calculation steps are extremely complicated. When the number of basic events contained in the minimum cut and path set is greater than or equal to 7 , human calculation has become unrealistic, the process of "four-principle comparison method" is relatively simple, and the obtained results are approximate, and in some cases, there may be errors in the calculated results. ...

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Problems solved by technology

[0002] The fault tree analysis method is a commonly used method in system safety analysis, and judging the importance of the accident structure is one of the indispensable methods in the qualitative analysis of the fault tree. The tree structure importance coefficient and the "four-principle comparison method", the calculation of the accident tree structure importance coefficient is accurate, but the calculation steps are extremely complicated. When the number of basic events contained in the minimum cut and path set is greater than or equal to 7 , human calculation has become unrealistic, the process of "four-principle comparison method" is relatively simple, and the obtained results are approximate results, and in some cases there may be errors in the calculated results

[0003] If the basic events contained in the minimum cut and radius sets have the same number of occurrences in the minimum cut and radius sets, the order of the related cut (path) sets of the two basic events is also the same, the occurrence times of the two events are less than the maximum occurrence times, and the related occurrence times If they are not the same, there will be errors in the structural importance calculated by using the "four principles comparison method".

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