动力翼伞系统耦合补偿控制策略研究

动力翼伞系统是具有强非线性、强耦合特性的系统，其精确控制比较困难.动力翼伞系统具有两个控制通道，控制的难度在于纵向推力对下偏控制存在着非线性的强耦合作用，在受到风场干扰时会导致系统耦合加剧，从而在控制过程中引起较大偏差，甚至导致系统失速.本文提出了一种基于耦合补偿的自抗扰控制策略，并将该非线性耦合关系设计为扩张状态观测器中的已知扰动，从而提高了控制器的跟踪性能.在动态耦合补偿的基础上改进控制律，将非线性动力翼伞系统设计成易于控制的独立积分器，从而提高横向轨迹跟踪控制器的抗干扰性和控制跟踪性能.通过仿真实验可验证该控制策略优于传统的自抗扰控制（active disturbances rejection controller，ADRC）和PID控制. 

Control Strategy of Power Parafoil System Based on Coupling Compensation

Powered parafoil system is strongly nonlinear and contains complicated cross-coupling characteristic, which makes the system hard to control. Under the variable wind disturbance, this coupling influence will aggravate the control performance, probably resulting in large deviations or instability in the control process. An active disturbance rejection control (ADRC) strategy based on the coupling compensation was proposed. The dynamic cross-coupling relation of the longitudinal thrust on the lateral yaw control was designed as the known disturbance of extended state observer (ESO) to be compensated in the improved control law, so that the tracking ability of the controller could be enhanced. Moreover, under the cross-coupling compensation, a complex nonlinear powered parafoil system was constructed as integrators which could be easily controlled, such that the tracking precision and disturbance rejection capacity of the lateral controller were improved. Eventually, mathematical simulations demonstrate that the proposed control approach has better tracking performance and robustness compared with the conventional ADRC and PID.