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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。
Aiming at the characteristics of large flight envelope span of reentry vehicle, system uncertainty and strong interference, a switching multicellular control method based on interference observer is proposed. The reentry vehicle is modeled to switch multicellular systems, and the uncertainties and disturbances in the system are equivalent to compound interference. A disturbance observer based on adaptive Super-Twisting algorithm is proposed to estimate the complex interference of the system and compensate in the controller design to restrain the influence of compound interference on the system. The Lyapunov function method is used to prove the stability of the closed-loop switched multicellular system under the all-envelope condition considering the complex interference. The numerical simulation results show that this method can restrain the system uncertainties and disturbances effectively and can accurately track the command signals.