Journal
NONLINEAR DYNAMICS
Volume 67, Issue 3, Pages 2081-2088Publisher
SPRINGER
DOI: 10.1007/s11071-011-0130-3
Keywords
Flexible spacecraft; PD control; Disturbance observer (DO); Multiple disturbances; Vibration control; Composite hierarchical anti-disturbance control
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Funding
- National Natural Science Foundation of China
- National 973 program
- National 863 program
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This paper studies the attitude control problem of spacecrafts with flexible appendages. It is well known that the unwanted vibration modes, model uncertainty and space environmental disturbances may cause degradation of the performance of attitude control systems for a flexible spacecraft. In this paper, the vibration from flexible appendages is modeled as a derivative-bounded disturbance to the attitude control system of the rigid hub. A disturbance-observer-based control (DOBC) is formulated for feedforward compensation of the elastic vibration. The model uncertainty and space environmental disturbances as well as other noises are merged into an equivalent disturbance. We design a composite controller with a hierarchical architecture by combining DOBC and PD control, where DOBC is used to reject the vibration effect from the flexible appendages. Numerical simulations are performed to demonstrate that by using the composite hierarchical control law, disturbances can be effectively attenuated and the robust dynamic performances be enhanced.
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