柔性多体卫星自抗扰控制系统的研究

设计了一种新型的姿态控制器一姿态自抗扰控制器。采用简化了的刚体动力学模型，即把柔性太阳帆板与柔性天线等的振动都看作外干扰，对象的不确定性、未建模动态与外干扰的总量都由自抗扰控制器估计出，再用该估计总量实现动态反馈补偿。该姿态控制器，只需控制输入转换矩阵的估计值，无需精确的卫星动力学模型。改变星体转动惯量或设置干扰力矩情况下的数学仿真表明，所设计的自抗扰控制器具有较小的稳态误差、较快的动态响应及对干扰有较强的抑制能力。

Active Disturbance Rejection Control for Flexible Multi-body Satellite System

In order to estimate total disturbances including parametric uncertainties,un-modeled dynamics and external disturbances,and achieve the dynamic feedback compensation of the estimated total disturbances,we design a double closed loop attitude active disturbance rejection controller(ADRC),by taking flexible vibrations of solar panels and a flexible antenna as an external disturbance,and using only the estimated transformation matrix of control input in the simplified dynamic model to enable us to use a simplified dynamic model to replace the accurate dynamic model of a rigid body in a flexible multi-body satellite dynamics model.Simulation results indicate that the attitude ADRC designed has a small steady error,a fast dynamic response,and an obvious rejection of flexible vibrations,no matter the rotational inertia of a satellite body increases to 200%,decreases to 50% or under the condition of large external disturbance acts on.Therefore,we come to the conclusion that the ADRC designed can be used to solve the problem of control systems with uncertainties in the process of modeling different flexible multi-body systems.