Parameters design of vibration isolation platform for control moment gyroscopes

摘要

Vibration isolation is a direct and effective approach to improve the ultra-precise pointing capability of a high resolution remote sensing satellite. In this paper, a passive multi-strut vibration isolation platform for the control moment gyroscopes in a pyramid configuration on a satellite is adopted and the parameter design of this platform is discussed. The first step constructs a whole satellite dynamic model including the control moment gyroscopes and the vibration isolation platform with Newton-Euler method, while the analytical control moment gyroscopes disturbance model is derived. The transmissibility matrix of the vibration isolation platform is then obtained, and the frequency domain characteristics of the platform are described, with its influence on the attitude control system analyzed. The third part presents the parameter design method of the vibration isolation platform based on the frequency domain characteristics mentioned above. The stiffness and damping coefficients of this platform are subsequently selected with the above mentioned method. Finally, using these parameters, the performance of the vibration isolation platform on the satellite is testified by integrated simulations. The study shows that parameters of this platform selected based on this method not only satisfy the requirement of vibration isolation but also guarantee that the closed-loop attitude control system remains sufficiently stable.