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本文针对气动参数和惯性参数不确定性,同时考虑反作用控制系统(RCS)参与控制,设计高超声速再入飞行器的鲁棒自适应控制器.根据奇异摄动理论将整个控制系统分为快、慢两个回路分别进行设计,将各回路的不确定参数写成矢量的形式,并用自适应估计器进行在线估计,从而使得控制器实现在线自适应调整.利用非线性干扰观测器来处理控制系数矩阵的不确定性部分.提出一种改进的控制分配权重函数,并将总控制力矩分配到气动舵面偏角指令和RCS所需提供的控制力矩指令.利用Lyapunov稳定性理论来分析整个闭环系统的稳定性.最后,通过仿真验证该控制方案能够有效抑制不确定参数引起的干扰.
In this paper, a robust adaptive controller for hypersonic reentry vehicle is designed for aerodynamic parameters and inertial parameter uncertainties while taking into account the participation of reaction control system (RCS) .According to singular perturbation theory, the whole control system is divided into fast and slow The two loops are designed respectively, and the uncertain parameters of each loop are written in the form of vector, and the on-line estimation is made by using adaptive estimator, so that the controller can realize online adaptive adjustment.Using the nonlinear disturbance observer to process the control coefficient matrix Uncertainty part.An improved control distribution weighting function is proposed and the total control torque is assigned to the control command of the rudder angle and RCS.The Lyapunov stability theory is used to analyze the stability of the whole closed-loop system Finally, the simulation results show that the proposed control scheme can effectively suppress the interference caused by uncertain parameters.