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机载气象雷达(WXR)的安全性直接影响整机系统和飞行的安全。因此,以WXR典型故障为对象,详细研究了系统安全性分析的故障树方法(FTA)。通过定性及定量分析,解算出了故障树最小割集,计算了顶事件的概率,为实现系统的最佳安全控制目标提供一个具体量的概念。并计算了底事件重要度,对各重要度进行排序,确定对了各基本事件进行安全控制所应采取措施的优先顺序,为提高安全性优化效率提供了指导方案。
The safety of airborne weather radar (WXR) directly affects the whole system and flight safety. Therefore, the fault tree method (FTA) of system security analysis is studied in detail with WXR typical faults. Through qualitative and quantitative analysis, the minimum cut set of the fault tree is calculated and the probability of the top event is calculated, providing a concrete concept for realizing the optimal safety control goal of the system. And calculates the importance of the bottom event, sorts the importance degree, determines the priorities of the measures that should be taken for the safety control of each basic event, and provides a guideline for improving the efficiency of safety optimization.