An anti-disturbance PD control scheme for attitude control and stabilization of flexible spacecrafts |
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Authors: | Hua?Liu Email author" target="_blank">Lei?GuoEmail author Yumin?Zhang |
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Institution: | (1) Department of Control Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China |
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Abstract: | 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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Keywords: | |
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