强容错的航空发动机空中停车实时监测逻辑研究

In order to ensure the fast execution of the air-start strategy or the emergency operations taken by the pilot, a real-time monitoring logic with high fault tolerance is designed for aero-engine in-flight shutdown. The logic combines fault characteristics of fan speed, compressor speed, temperature after turbine and corrected fuel flow rate, along with some fault-tolerant strategies, such as threshold setting, parameters range limiting and negative penalty processing, and it can adapt to engine individual differences, performance degradation, nonstandard atmosphere environment, normal noise of sensors and faults of single sensor. Both mission profiles test and random acceleration and deceleration test in the full envelope are used to verify the robustness and fault tolerance of the logic. Results of false-alarm test and fault detection performance verification show that there is no false alarm in the monitoring process when the engine works normally or one sensor fails. In the meanwhile, the monitoring logic proposed in this paper has better fault detection performance compared with the logic of the АЛ-31Ф engine in-flight shutdown, and the detection performance of the monitoring process does not degrade when one sensor fails.