To solve the flight safety problem caused by nonlinear instabilities（category II pilot induced oscillations, PIOs） of the closed-loop pilot-vehicle system with rate-limiting actuator, the antiwindup（AW） compensati...To solve the flight safety problem caused by nonlinear instabilities（category II pilot induced oscillations, PIOs） of the closed-loop pilot-vehicle system with rate-limiting actuator, the antiwindup（AW） compensation method to avoid category II PIOs is investigated. Firstly, the AW compensation method originally used for controlling input magnitude limited system is introduced, then this method is extended for controlling input rate-limiting system through a circle criterion theorem. Secondly, the establishment of the AW compensator is transformed into the solving of linear matrix inequalities. Finally, an AW compensator establishment algorithm for the closed-loop pilot-vehicle system with the rate-limiting actuator is obtained. The effectiveness of the AW compensation method to avoid category II PIOs is validated by time-domain simulations,and compared with rate-limited feedback（RLF） command rate compensation method. The results show that the AW compensation method can effectively suppress category II PIOs and maintain the nominal performance when the closed-loop pilot-vehicle system is normal. Unlike the command rate compensator which works upon system uninterruptedly, the AW compensation method affects the closed-loop pilot-vehicle system only when the rate-limiting of actuator is activated, so it is a novel PIO avoidance method.展开更多
单人制机组运行(Single Pilot Operation,SPO)场景中,飞行员负荷与疲劳会使飞机操控精度降低,甚至出现飞行员诱发振荡(Pilot Induced Oscillation,PIO)现象。为缓解PIO问题,分析了飞行员操作增益和时延对飞机振荡的影响作用,并建立基于...单人制机组运行(Single Pilot Operation,SPO)场景中,飞行员负荷与疲劳会使飞机操控精度降低,甚至出现飞行员诱发振荡(Pilot Induced Oscillation,PIO)现象。为缓解PIO问题,分析了飞行员操作增益和时延对飞机振荡的影响作用,并建立基于生理指标和外部条件的认知能力评估模型,以设计飞行员诱发振荡自适应调节策略。通过建立认知能力与飞行员操作水平的对应关系,实现了基于飞行员身体状态和外部条件所需为输入的飞行员诱发振荡抑制过程。以A320机型为例设置模拟场景,采用MATLAB进行仿真。结果显示:在诱发振荡初期,飞机驾驶超调量降低了约25%;50 s内,相同参数下的诱发振荡超调量平均减少了约66%,并逐渐步入稳定状态。这表明基于认知能力评估的自适应调节模型能够缓解单一飞行员工作负荷和疲劳,增加飞行员操纵的动态和静态稳定性,有效抑制了单人制机组运行时由人的因素引起的诱发振荡问题。展开更多
基金supported by the National Basic Research Program(973Program)(2015CB755805)the National Natural Science Foundation of China(61374145)
文摘To solve the flight safety problem caused by nonlinear instabilities（category II pilot induced oscillations, PIOs） of the closed-loop pilot-vehicle system with rate-limiting actuator, the antiwindup（AW） compensation method to avoid category II PIOs is investigated. Firstly, the AW compensation method originally used for controlling input magnitude limited system is introduced, then this method is extended for controlling input rate-limiting system through a circle criterion theorem. Secondly, the establishment of the AW compensator is transformed into the solving of linear matrix inequalities. Finally, an AW compensator establishment algorithm for the closed-loop pilot-vehicle system with the rate-limiting actuator is obtained. The effectiveness of the AW compensation method to avoid category II PIOs is validated by time-domain simulations,and compared with rate-limited feedback（RLF） command rate compensation method. The results show that the AW compensation method can effectively suppress category II PIOs and maintain the nominal performance when the closed-loop pilot-vehicle system is normal. Unlike the command rate compensator which works upon system uninterruptedly, the AW compensation method affects the closed-loop pilot-vehicle system only when the rate-limiting of actuator is activated, so it is a novel PIO avoidance method.
