The reliability of the emergency flotation system of helicopters is analysed by using fault tree analysis and the Monte Carlo method. We constructed a fault tree with the failure of system as the top event and obtained the minimal cut set, the ranking of the structural importance of the bottom events and the probability of the occurrence of the top event. Based on the system fault tree, a Monte Carlo simulation model of the emergency flotation system is established by using Matlab/Simulink. The results show that the Monte Carlo method is feasible and effective for the reliability analysis of the emergency flotation systems of helicopters. Furthermore, the comparison between the criticality importance and mode importance of each subsystem suggests that the control component is the weakest part of the emergency flotation systems, thereby providing a basis for system reliability design and fault diagnosis.

中文翻译：

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直升机应急漂浮系统的可靠性分析

通过故障树分析和蒙特卡洛方法对直升飞机应急漂浮系统的可靠性进行了分析。我们构造了一个以系统故障为最主要事件的故障树，并获得了最小割集，最重要事件的结构重要性等级以及最重要事件发生的概率。基于系统故障树，利用Matlab / Simulink建立了应急浮选系统的蒙特卡洛仿真模型。结果表明，蒙特卡罗方法对直升机应急浮选系统的可靠性分析是可行和有效的。此外，每个子系统的重要性和模式重要性之间的比较表明，控制组件是应急浮选系统中最薄弱的部分，