Design and Dynamic Analysis of Micro-vibration Isolator for Single Gimbal Control Moment Gyro

Control moment gyros (CMGs) are widely used for attitude control in spacecraft. However, micro-vibrations generated from these high speed spinning actuators has a significant impact on high-sensitivity space mission. Based on the energy dissipation mechanism of viscoelastic material, this research puts forward a passive isolator for Single Gimbal CMG (SGCMG). Dynamic model of this proposed isolator is developed and analyzed, and then isolation performance is improved through parameters optimization. Numerical simulations indicate that disturbances with frequency above 40 Hz can be isolated in all six degrees of freedom. In addition, the resonant peak in transmissibility has been greatly suppressed due to the structural damping that provided by viscoelastic material.