针对2.4 m跨声速风洞总压和马赫数控制具有强耦合、时滞、系统参数摄动和外界干扰不确定性等特点，设计了预测自抗扰控制。采用自抗扰控制（ADRC），将总压和马赫数两个通道之间的耦合、流场建模误差、系统的参数摄动和外界干扰等视为总干扰，通过扩张状态观测器（ESO）将总干扰估算出来并进行前馈补偿，一方面可以实现总压和马赫数的解耦控制，另一方面提高了流场的抗干扰能力。同时使用Smith预估器得到系统无时延输出并将其反馈至扩张状态观测器，加快其收敛速度，从而提高控制系统的性能。仿真结果表明，该控制器能够很好地实现总压和马赫数的解耦，并且具有良好的动态特性、抗干扰能力和鲁棒性。
The total pressure and Mach number control in the 2.4 m transonic wind tunnel are characterized by strong coupling, time delay, perturbation of system parameters and uncertainty of external disturbances. In order to solve these problems, a predictive Active Disturbance Rejection Control (ADRC) is designed. According to the principle of ADRC, the coupling between the total pressure and Mach number, the modeling errors and the parameter perturbation of the flow field, and the external disturbance can be regarded as total disturbance. Then the total disturbance is estimated by the Extended State Observer (ESO) and compensated by feed-forward control. The decoupling control of total pressure and Mach number is realized and the anti-interference ability of flow field is improved. At the same time, the Smith predictor is used to get the system delay-less output and feed it back to the extended state observer to speed up its convergence speed, so as to improve the performance of the control system. The simulation results show that the controller can realize the decoupling control well with good dynamic characteristics, anti-interference ability, and robustness.
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