基于自适应滑模观测器的航空发动机故障诊断

为解决现有航空发动机基于模型的在线故障诊断方法存在对模型精度要求高等的问题，利用滑模方法设计一种自适应滑模观测器对航空发动机进行在线故障重构、诊断与隔离。对传感器故障和执行机构故障分别设计了重构算法，针对两者重构故障的特点提出了判断逻辑，讨论了设计参数对于观测效果与抖振的影响。 Matlab/Simulink仿真结果显示，重构的故障与实际故障基本吻合，对故障的诊断、隔离、定位具有良好效果，并对环境不确定性具有优良的鲁棒性。

Fault Diagnosis of Aircraft Engines Based on Adaptive Sliding Mode Observers

Existing model-based fault-diagnosis methods of aircraft engines require high precision engine model. To deal with these shortcomings,a new approach based on adaptive sliding mode observer to de-tect,isolate,and identify faults is proposed,which has strong robustness properties and disturbance rejec-tion properties. The fault reconstruction algorithms respectively for sensor faults and actuator faults are al-so presented,whereby this two kinds of the faults can be distinguished. Moreover,design guideline of the proposed observer is analyzed,as well as the influence of critical parameters on chattering. The efficiency of the proposed fault diagnosis approach are validated with Matlab/Simulink. The simulation results indi-cate that the adaptive observers do well in both fast tracking and detection.