Abstract A novel finite-time neural control strategy is proposed for flexible spacecraft with guaranteed attitude tracking performance subject to parametric uncertainty, uncertain external disturbance, unmeasured elastic vibration and actuator saturation. First, a new finite-time performance function is developed. Then, unlike some existing prescribed performance control methodologies, a novel finite-time controller is derived to guarantee that the attitude tracking errors can converge to a preselected range of the equilibrium within predetermined time independent of the initial conditions. The derived controller is then extended by a neural network compensator to reject the disturbance and overcome the unknown actuator saturation. Specially, the computation burden is reduced by updating the norm of ideal weight vectors rather than their elements with the aid of minimal-learning-parameter technique. Finally, apart from showing the stability of the closed-loop system, numerical simulations demonstrate the effectiveness, robustness and superiority of the proposed approach.
Highlights A novel finite-time prescribed performance function is proposed. The implementations of this function and its derivative are simple. The control errors can converge to the specified range in preselected settling time. An integrated control method for flexible spacecraft attitude tracking is proposed. The computation burden is lightened by using minimal learning parameter technique.
Novel finite-time adaptive neural control of flexible spacecraft with actuator constraints and prescribed attitude tracking performance
Acta Astronautica ; 179 ; 646-658
2020-10-08
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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