Spacecraft vibration suppression based on micro-gimbal moment of magnetically suspended flywheel with dynamic feedback and feedforward decoupling control

Abstract

Aimed at solving the prominent issue of spacecraft high-frequency vibration suppression, this paper creatively puts forward a novel method based on the micro-gimbal moment of magnetically suspended flywheel with dynamic feedback and feedforward decoupling control. The dynamic model of the on-orbit magnetically suspended flywheel is established first and the decoupling control law of spacecraft as well as the micro-gimbal steering law of the magnetically suspended flywheel is designed. The disturbance compensator based on dynamic feedback–feedforward current is put forward to cancel the disturbance of spacecraft to the magnetically suspended flywheel. Then the nonlinear on-orbit magnetically suspended flywheel system is converted into a linear system without spacecraft coupling, and the state feedback decoupling controller is used to realize the high-precision micro-gimbal moment control of the magnetically suspended flywheel. The dynamic compensation filter is further developed to reduce the influence of unmodeled dynamics on decoupling performances, improving the rate of convergence of vibration suppression. The above three components constitute together the dynamic feedback and feedforward decoupling controller. The simulation results show the effectiveness and superiority of this method.

Keywords

Spacecraft vibration suppression on-orbit magnetically suspended flywheel micro-gimbal moment dynamic feedback and feedforward decoupling disturbance compensator state feedback decoupling dynamic compensation filter

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