基于干扰观测器的再入飞行器切换多胞控制

针对再入飞行器飞行包线跨度大,系统不确定性及强干扰的特点,提出了一种基于干扰观测器的切换多胞控制方法。将再入飞行器建模为切换多胞系统,并将系统中的不确定项和干扰项等价为复合干扰。提出基于自适应Super-Twisting算法的干扰观测器对系统复合干扰进行估计,并在控制器设计中进行补偿,抑制复合干扰对系统的影响。利用Lyapunov函数方法证明了考虑复合干扰情况下闭环切换多胞系统全包线内的稳定性。数值仿真结果表明,该方法对于系统不确定和干扰具有较强抑制效果,能够实现对指令信号的精确跟踪。

Reentry vehicle switched polytopic system control based on disturbance observer

To solve the control problem of reentry vehicles which have large flight envelope, system uncertainties and disturbances, the switched polytopic systems are establised. The reentry vehicle is modelled as the switched polytopic system. Both system uncertainties and disturbances are considered as complex disturbances. A kind of disturbance observer is proposed base on the adaptive Super-Twisting algorithm to estimate the complex disturbances. And the estimate value is used to compensate the disturbances in the controller. The stability of the closed loop system considering the complex disturbances in the entire envelope is proved by Lyapunov function. The simulation result validates that the proposed method has the ability of anti-disturbance and can achieve accurate command tracking.