Fault Injection Strategy Based on FTA Optimized by Fuzzy Gray Relational Degree Analysis

In order to solve the problem in random fault injection strategy which might lead to failed fault injection, a fault injection strategy based on fuzzy gray relational fault tree analysis is presented. First, fuzzy probability of basic events are determined by normal fuzzy number, so that the fuzzy median of top events and the fuzzy importance of basic events could be figured out. Then, comparison of sequences and reference sequences of gray relational analysis could be determined. Finally, the gray relational degree ranking of the minimal cut sets is taken as the basis of fault injection point selection. Case study shows that this method could not only efficiently solve the fuzzy and gray problems in selecting fault injection points, but also has popularization and application value for its convenience.