Adaptive robust vibration control with input shaping as a flexible maneuver strategy

An adaptive robust control is presented for the vibration reduction of a fl exible spacecraft by combining the input shaping technique with the sliding -mode control. The combined approach appears to be robust in the presence o f a severe disturbance and an unknown parameter which will be estimated by on-line least-square method. As a maneuver strategy, it is found that a syn thesized trajectory with a combination of low-frequency mode and rigid-body mode results in better performance and is more efficient than the traditio nal rigid-body trajectory alone which many researchers have employed. The f easibility of the vibration control approach is demonstrated by applying it to a benchmark problem in aerospace. For the applications of the proposed technique to realistic flexible spacecraft systems, several requirements ar e discussed such as mode stabilization and enormously large system order.