摘要： 针对目前飞机恒速恒频交流(CSCF-AC)电源系统故障诊断方法中存在的虚警率高、信息不能共享等问题，提出一种基于动态故障树(DFT)的CSCF-AC电源系统网络化故障诊断方法。通过在普通布尔算子中引入BEFORE算子，对CSCF-AC电源系统动态故障树进行定性分析，得到系统的失效模式，在此基础上建立一个包括机内自检、地面诊断和远程专家诊断在内具有三层结构的网络化故障诊断系统。实验结果表明，该方法有效可靠，具有一定的工程实用性。

关键词: 动态故障树, 飞机电源系统, 故障诊断, BEFORE算子

Abstract: Aiming at the defects of the fault diagnosis in aircraft Constant Speed Constant Frequency Alternation Current(CSCF-AC) power supply, this paper proposes a new diagnosis method based on the Dynamic Fault Tree(DFT) and network. By adding a new operator BEFORE to the usual Boolean operators in the qualitative analysis of the DFT, this method provides a complete qualitative description of the system, and that any failure distribution can be accommodated. Then a 3-layer networked diagnosis system, which includes built-in test equipment in aircraft, diagnosis center on the ground, and remote experts from airlines, aircraft manufacturers or research institutes, is designed and developed. Experiments in the local area network show that the diagnosis method is effective and reliable, and the engineering effectiveness of the system is verified.

Key words: Dynamic Fault Tree(DFT), aircraft power supply system, fault diagnosis, BEFORE operator

中图分类号: 

• TP273