›› 2012, Vol. 32 ›› Issue (4): 45-53.doi: 10.3780/j.issn.1000-758X.2012.04.007

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Disturbance Modeling and Performance Index Evaluation of the Small Control Moment Gyroscope

Zhang Yao1,Jin Lei2,Xu Shijie2   

  1. (1 School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081)
    (2 School of Astronautics, Beihang University, Beijing 100191)
  • Received:2011-11-28 Revised:2012-03-07 Online:2012-08-25 Published:2012-08-25

Abstract: Control moment gyro (CMG) is widely used as the actuator for attitude control on satellites recently. To realize high precise pointing capability of a high resolution remote sensing satellite, the disturbance modeling and performance index evaluation of CMG were discussed. Firstly, considering the static and dynamic imbalances of the rotor and installation errors, the small CMG dynamic model was constructed  by means of the theorem of momentum and theorem of angular momentum. The validity of this model was analyzed based on an experience model of a flywheel and testified by numerical simulation. Secondly, a cluster of the CMGs were adopted and the whole satellite dynamic model was derived. To complete the mission of the satellite attitude stabilization control, the reasonable servo control systems of the gimbals and the rotor were selected. Finally, the influences of the CMG disturbances on the attitude precision and satellite stability were analyzed in detail. According to the space mission of the high resolution remote sensing satellite, the constraint condition of the CMG performance index was obtained to meet the imaging requirements of the optical payloads.

Key words: Small control moment gyroscope, Disturbance modeling, Attitude stabilization, Performance index, Remote sensing satellite