Abstract:
Single gimbal control moment gyroscope (SGCMG) plays a crucial role in the attitude control of small satellites. The precision of the rotational speed of the gimbal in SG...Show MoreMetadata
Abstract:
Single gimbal control moment gyroscope (SGCMG) plays a crucial role in the attitude control of small satellites. The precision of the rotational speed of the gimbal in SGCMG determines the accuracy of the output torque for adjusting the attitude. When the gimbal rotates, the primary flexible components of the SGCMG, the bearings, exhibit time-varying stiffness due to the large changes in the tribological properties of the ball-raceway (lubrication status and contact characteristics), which, in turn, impacts the gimbal speed. In light of this, this article proposes a control strategy to reduce the impact of bearing flexibility on the rotational speed of gimbal. Firstly, considering the tribological properties of the bearings, an electromechanical tribo-dynamic for CMG is established. Secondly, the disturbance affecting the gimbal's motion are computed through sensors or dynamic equations, leading to the proposal of an Active Disturbance Rejection Control based on model compensation (MCADRC). Finally, through simulation and experimentation, and a comparative analysis with traditional ADRC, the proposed control algorithm is demonstrated to enhance the dynamic response performance and disturbance rejection capabilities of the system.
Published in: IEEE Transactions on Aerospace and Electronic Systems ( Early Access )