The failure of underwater vehicles often leads to serious economic and scientific value losses,and o-verall failure events caused by the failure of control system equipment and components are particularly common.In order to accurately understand the reliability of the control system of underwater vehicles,the fault tree was constructed to obtain the minimum cut set of the fault tree,and the combination of control system failure events was obtained.Based on the logical relationship between the intermediate events and the basic events of the fault tree structure,the reliability analysis model of the control system was established,and a method of directly cal-culating the reliability by using the minimum cut set was proposed.Compared with the traditional reliability block diagram method to calculate the reliability of the system,the results showed that the method of calculating system reliability through the minimum cut set had a clearer mathematical logic,solved the problem of mathe-matical expression discontinuity caused by drawing reliability diagrams,and significantly improved the conven-ience and inference efficiency of reliability analysis,and was of great significance for the safety analysis of under-water vehicles throughout their entire life cycle.
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