基于模型的故障诊断在空间电源系统中的应用研究

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。

Application of model-based fault diagnosis in aircraft power system

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.