Abstract
This paper deals with the problem of reliable finite frequency vibration control for flexible spacecraft subject to torque constraint, actuator failure and linear fractional transformation (LFT) uncertainty. The practical sampled-data control signal is converted into a continuous-time input with time-varying delay. Since the main vibration energy of flexible spacecraft is dominated by low-frequency vibration modes lying in a specific frequency band, a novel reliable robust \(H_\infty \) output feedback controller with frequency constraint is employed here to suppress these resonance modes. Compared with classic full frequency scheme, finite frequency algorithm achieves a lower upper bound of vibration reduction performance even under the circumstance of torque constraint, actuator failure and LFT uncertainty. By convex optimization techniques, the problem of seeking admissible controller is transformed into the feasibility of linear matrix inequalities. The merits and effectiveness of proposed control algorithm are confirmed by an illustrative design example.
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Appendix
Appendix
Case 1 The parameters of finite frequency controller with known actuator faults are given as,
The parameters of entire frequency controller with known actuator faults are given as,
The parameters of finite frequency controller with unknown actuator faults are exhibited as,
The parameters of entire frequency controller with unknown actuator faults are exhibited as,
Case 2 The parameters of finite frequency controller for system with LFT uncertainty are given as,
The parameters of entire frequency controller for system with LFT uncertainty are given as,
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Xu, S., Sun, G. & Sun, W. Reliable sampled-data vibration control for uncertain flexible spacecraft with frequency range limitation. Nonlinear Dyn 86, 1117–1135 (2016). https://doi.org/10.1007/s11071-016-2952-5
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DOI: https://doi.org/10.1007/s11071-016-2952-5