Active vibration control of flexible spacecraft using modified input shaping and adaptive positive position feedback

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Active vibration control is a crucial issue for modern flexible spacecraft because the flexible dynamics may interact with the attitude/orbit dynamics, which makes high-precision attitude/orbit control more difficult. To address this issue, a strategy that combines modified input shaping technique and adaptive positive position feedback is proposed to control vibration of flexible spacecraft. Modified input shaping will be integrated with spacecraft actuators, momentum wheels and jet thrusters, to suppress several low-order vibration modes, while adaptive positive position feedback will be applied to piezoelectric smart actuators to control the dominant high-order vibration modes. The research work will be conducted as follows. Firstly, the basic principles of modified input shaping will be investigated and an adaptive algorithm will be developed for automatic tuning of parameters of the positive position feedback filters. Secondly, a detailed 3-axis dynamic model for flexible spacecraft will be developed based on flexible multi-body dynamics. The actuator configuration problem will be studied and the optimal configuration will be determined. Thirdly, the hybrid vibration controller that combines modified input shaping and adaptive positive position feedback will be developed. Method will also be developed to minimize the interaction of these two vibration controllers. The stability of the hybrid vibration controller will be proved through stability theory. Different spacecraft on-orbit operation modes will be considered as well. Then, numerical simulation will be conducted using MATLAB/Simulink to validate the theoretical analysis. Finally, hardware experiments will be conducted to verify the effectiveness of the proposed vibration control strategy. By using the proposed strategy, it is expected that the flexible vibration of spacecraft can be suppressed to an allowable level quickly so that high-precision attitude/pointing control can be achieved.