航空发动机被动容错控制器优化设计研究

Study of the Optimized Design of the Passive Fault-tolerant Controller of an Aeroengine

针对航空发动机发生故障时系统的容错能力问题,设计了基于特征结构配置方法的容错控制系统。首先分析了被动容错控制的特点和优点,然后采用特征结构配置的方法,在配置系统极点的同时,还配置系统的特征向量,并对系统进行重新调节以获得整个系统在故障发生后的稳定性与可靠性,给出了特征结构配置方法的具体设计步骤。然后,在该方法的基础上,设计了被动容错控制器。最后,针对某型航空发动机的设计工况点模拟系统发生故障,即参数发生摄动时,对所设计的容错控制器系统的鲁棒性进行了仿真分析。仿真结果表明,经过特征结构配置后,系统的稳态输出值能够被调整到原系统稳态输出值的附近,维持系统的性能,即系统具有较好的容错能力。

In the light of the fault-tolerant ability of the system of an aeroengine when a fault occurred,designed was a fault-tolerant control system based on a characteristic structure deployment method.First,the features and merits of the passive fault-tolerant control were analyzed.Then,the characteristic structure deployment method was adopted.At the same time of the limit points of the system being deployed,the characteristic vectors were also deployed and the system was regulated once again to obtain the stability and reliability of the whole system after a fault has occurred.Furthermore,the concrete design steps of the characteristic structure deployment method were given.Afterwards,on the basis of the method under discussion,a passive fault-tolerant controller was designed.Finally,at the design operating point of an aeroengine,when a fault occurred to its simulation system,i.e.,when the parameters were being perturbated,a simulation analysis was performed of the robustness of the fault-tolerant controller system thus designed.The simulation results show that after the characteristic structure deployment,the stable state output values of the system can be adjusted to ones close to those of the original system with the system performance being maintained,i.e.the system has a relatively good fault-tolerant ability.