Failure-tolerant control for small agile satellites using single-gimbal control moment gyros and magnetic torquers |
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Authors: | Tao Meng and Saburo Matunaga |
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Institution: | Tao Meng School of aeronautics and astronautics,Zhejiang University,310027 Hangzhou,China Saburo Matunaga Dept.of Mechanical and Aerospace Engineering,Tokyo Institute of Technology,Japan.Fellow-AIAA. |
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Abstract: | This paper focuses on the attitude control problem of small agile satellites using single-gimbal control moment gyros (CMG)
and magnetic torquers (MTQ). CMGs are regarded as effective torque generators for agile satellites because of their torque
amplification capability. However, they are vulnerable to failure due to their complex inner mechanism. In this paper, different
failure cases of CMGs are analyzed. A flexible failure-tolerant control strategy is developed by automatically redistributing
the required control torque among the operating CMGs and MTQs, with a variable limiter to accommodate the actuator dynamics
changes introduced by CMG failures. The performances of maneuvers about different directions under different failure cases
are also discussed and examined. Numerical simulations demonstrate that the proposed strategy maintains certain agility in
the cases of one or two CMGs failing. Moreover, a survival strategy with only one CMG left is also verified. Both sun-pointing
stabilization and earth-pointing stabilization can be achieved in this case, which fulfill some basic mission requirements. |
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Keywords: | Attitude control · Failure-tolerant · Mixed steering logic · CMG · MTQ |
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