基于模型的故障诊断在空间电源系统中的应用研究

Application of model-based fault diagnosis in aircraft power system

空间电源系统工作时间长、运行环境特殊,在执行任务期间不可避免发生故障。为保障任务完成,需建立起空间电源系统在线故障诊断系统,实现在线故障检测、诊断和修复(FDIR),防止故障传播和灾难性事故发生。在分析空间电源系统电路结构和故障特征基础上,建立起基于模型在线故障诊断系统。通过分析和论证,该诊断系统能够很好的诊断出空间电源系统电路的单点故障、多重故障及单传感器故障,并具有较好的诊断推理速度和较高的准确性。

Since the aircraft power system usually operates for a long time and in a special environment, fault may occur during flight. In order to accomplish the task successfully and avoid fault propagation that may result in severe failure, it is necessary to build up an on-line fault diagnosis system to realize the real-time Fault Detection, Diagnosis, and Recovery （FDIR）. After analyzing the circuit structure and fault characteristics of the aircraft power system, the authors built an on-line model-based fault diagnosis system. Performance analysis demonstrate that this diagnosis system can detect the single-point fault, multiple faults and the single sensor fault of the aircraft power system, and it also has a high reasoning speed and accuracy.