关键词: 挠性航天器, 姿态机动, 非线性系统, 自适应鲁棒控制

Abstract:

In order to implement the rapid attitude maneuvering control of flexible spacecrafts in large-angle mobi-lity mode in the presence of inertia uncertainties and external disturbances in space, inspired by the model of cellmembrane discharge, an adaptive robust attitude controller is proposed. In the investigation, first, the kinematicsand dynamics of flexible spacecraft are analyzed. Then, an robust control law, which is based on the pre-plannedattitude trajectory and is adaptive to uncertain inertia, is put forward to improve the rapid attitude maneuvering per-formance and suppress the vibration of flexible panels. Finally, to avoid the degradation of pointing accuracy andstability due to the attitude jump during the maneuvering, an improved adaptive robust controller is designed basedon the dynamic model of cell membrane discharge. It is proved that the proposed controller guarantees the asymptoti-cal stability of the closed-loop system. Moreover, under bounded inertia estimation errors, uniformly-ultimatebounded tracking errors can be obtained with the controller. Simulation results verify the effectiveness of the pro-posed controller.

Key words: flexible spacecraft, attitude maneuvering, nonlinear system, adaptive robust control