模型预测控制方法在抑制Ⅱ型飞行员诱发振荡上的应用

Application of Model Predictive Control Method to Prevent CategoryⅡ Pilot Induced Oscillations

当速率限制器饱和时,其输出相对输入会产生相位滞后和幅值降低.基于模型预测控制(MPC)方法设计了控制器,将速率限制条件转化为系统输入的约束条件,从而最大限度地克服由速率限制器饱和引发的Ⅱ型飞行员诱发振荡(PIOs).分析了在正弦输入信号作用下控制器对系统相位的影响,并将控制器应用于人—机闭环系统进行仿真.结果表明,MPC控制器可使输出相位超前,PIOs未发生时可辅助飞行员消除系统误差,振荡条件下可完全克服速率限制器的影响,有效抑制PIOs发生.

The phase lag and amplitude between the input and the output decrease when the rate limiter is saturated. Based on the model predictive control （MPC） method, a controller is designed to convert the rate-limiting condition into the system input constraint, allowing it to prevent category II pilot-induced oscillations （PIOs） caused by the saturation of the rate limiter. The effects of the controller on the system phase are analyzed with sine input signals and the controller is applied to a pilot-aircraft closed loop system to carry out the simulation. The simulation resuhs show that the MPC controi｜er causes a phase lead. It can help the pilot eliminate the system error before PIOs occur, fully overcome the effects of the ratc-limiter under the occurring condition, and prevent PIOs effectively.