分离式飞行数据记录与跟踪系统可靠性分析

采用故障树分析方法分析了新型分离式飞行数据记录与跟踪系统的可靠性。通过搭建以系统失效为顶事件的故障树，获得了最小割集、顶事件的发生概率以及各分系统的失效概率排序。通过对比各分系统的关键重要度，找出了分离式飞行数据记录与跟踪系统中最薄弱的部分，并进行了改进。结果表明，缓降分系统对总系统可靠性的影响最大，通过多充气模块可以显著提高缓降系统的可靠性。但当充气模块多于2套时，增加充气模块并不能进一步明显提高系统的可靠性。

Reliability Analysis of Separate Flight Data Recording and Tracking System

The fault tree analysis was utilized to analyze the reliability of a new separate flight data recording and tracking system. The fault tree with system failure as the top event was built, and the probability of minimal cut set, the occurrence probability of top event and the sequence of fault probability of each subsystem were obtained. By comparing the criticality importance of each subsystem, the most vulnerable part of the separate flight data recording and tracking system was located, and then the system was optimized. The results show that the soft-landing system has the greatest impact on the system reliability. The reliability of soft-landing system can be significantly improved with the multi-inflation module, but the reliability of soft-landing system is not significantly improved when the number of inflatable module are more than two sets.