ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Anti-interference control of a single-frame controlled moment SGCMG servo system based on integral terminal sliding mode
Received date: 2024-06-03
Revised date: 2024-07-11
Accepted date: 2024-08-20
Online published: 2024-09-02
Supported by
National Natural Science Foundation of China(62273040)
The Single Gimbal Control Moment Gyroscope （SGCMG） is a crucial component in spacecraft attitude control. To address the impact of flexible isolators and unknown disturbances in space， a composite control scheme based on Integral Terminal Sliding Mode Control （ITSMC） and Finite-Time Disturbance Observer （FTDO） has been designed. This scheme effectively eliminates the uncertain disturbances present in flexible isolators and achieves the desired velocity within the convergence time. Compared to traditional PI controllers， the designed integral terminal sliding mode controller exhibits lower fluctuation amplitude and oscillation frequency， with a steady-state error ≤ 0.032， a 40% faster adjustment time， and a 24% reduction in overshoot， demonstrating stronger disturbance rejection capabilities. Additionally， a finite-time observer is designed for disturbance compensation on the integral terminal sliding mode controller， resulting in a further reduction of steady-state error to ≤ 0.003 and an overshoot reduced to 1%. The composite controller shows low chattering and strong disturbance rejection， effectively eliminating unknown disturbances in space. Finally， MATLAB simulations confirm that the proposed method achieves the desired performance.
Ming LU , Nuo SU , Weiheng ZHAO , Ge CAO , Limei TIAN , Qiang ZHANG . Anti-interference control of a single-frame controlled moment SGCMG servo system based on integral terminal sliding mode[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2024 , 45(S1) : 730768 -730768 . DOI: 10.7527/S1000-6893.2024.30768
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