Control model of the spherical magnetohydrodynamic attitude adjustment mechanism

Anlei Zhou - Qinghua Liang - Shigang Wang

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P.R. China

Abstract
This paper proposes a new method for three-axis attitude adjustment of microsatellites, using a spherical magnetohydrodynamic attitude adjustment mechanism as the active actuator for satellite attitude control. The working principle of this mechanism is analyzed, and its dynamic mathematical model is established. By utilizing the principle of vector control, the output torque of the mechanism is estimated, and a torque closed-loop vector control model is developed. Further research on the attitude control model is conducted, followed by joint simulations. The results indicate that the feedback torque value of this mechanism can closely follow the given torque, achieving closed-loop torque control. Additionally, this mechanism can output the desired torque at specified positions, meeting the requirements of attitude adjustment tasks. The method proposed in this paper not only retains the reliability of traditional control methods but also effectively overcomes issues related to space occupation and momentum utilization efficiency in traditional flow control methods, providing a new approach for active attitude control. Key words: magnetohydrodynamic, fluid momentum controller, output torque, attitude control. Tables 1, Figs 20, Refs 12.