The integrated motion and control problem of attitude-orbit coupling for fluid-filled spacecraft in the presence of parameter uncertainties and external perturbations is focused in this paper.The liquid sha-king is equivalent to a first-order spring-mass model,and a coupled dynamics model for the attitude-orbit of the liquid-filled spacecraft based on the dyadic quaternnion is established,and the coupled dynamics equa-tions for the attitude-orbit of the liquid-filled spacecraft and the equations of kinematics are deduced accord-ing to the laws of conservation of momentum and momentum moments.Regarding the external disturbances and model coupling characteristics,a preset performance terminal sliding mode control strategy based on an exponential form is proposed,which employs a disturbance observer to estimate the integrated disturbances and prove the stability of closed-loop systems by using Lyapunov theory.Finally,the numerical simulation results show that the fluid-filled spacecraft can realize accurate attitude-orbit control through the actions of the designed controller,which verify the effectiveness of the controller.
关键词
充液航天器/姿轨耦合控制/预设性能/干扰观测器/终端滑模控制
Key words
Liquid-filled spacecraft/Attitude-orbit coupling/Prescribed performance/Disturbance observ-er/Terminal sliding mode control
维普
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