An anti-disturbance PD control scheme for attitude control and stabilization of flexible spacecrafts
- First Online:
- 521 Downloads
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.
KeywordsFlexible spacecraft PD control Disturbance observer (DO) Multiple disturbances Vibration control Composite hierarchical anti-disturbance control
Unable to display preview. Download preview PDF.
- 5.Song, G., Kotejoshyer, B.: Vibration reduction of flexible structures during slew operations. Int. J. Acoust. Vib. 7(2), 105–109 (2002) Google Scholar
- 16.Guo, L., Feng, C.B., Chen, W.H.: A survey of disturbance-observer-based control for dynamic nonlinear system. Dyn. Contin. Discrete Impuls. Syst., Ser. B, Appl. Algorithms 13, 79–84 (2006) Google Scholar