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For a new kind of dual-spin spacecraft mission which is used for earth-observation, a method to manage the rotor's angular momentum with magnetic torquers is introduced in this paper. Three magnetic torquers fixed on the rotor part produce periodic magnetic momentum which contracts with Earth's magnetic field, balancing the angular momentum caused by friction of bearing while no angular momentum accumulation is caused to the other two axes. This method is applicable in engineering. Simulation shows that the total angular momentum of rotor converges to the desired value and does not accumulate over time. [ABSTRACT FROM AUTHOR]

For the problem of the singularity inherent in the system of single gimbal control moment gyros (SGCMGs) and the gimbal speed dead zone in the presence of single gimbal control moment gyro (SGCMG), a torque allocation algorithm for the hybrid actuators consisted of SGCMGs and flywheels is researched in this paper. The sum of SGCMG power consumption, the flywheel power consumption and flywheel angular momentum with different weights is treated as the performance index, the torque allocation algorithm for hybrid actuators is achieved by minimizing the performance index. The allocation algorithm's validity in avoiding singularities of SGCMGs is demonstrated by analyzing the allocation algorithm. The adjustment strategy of SGCMGs' power consumption weighted matrix is designed by which the problem that the gimbal speed gets into dead zone is solved. The adjustment strategy of flywheel angular momentum weighted matrix is designed, the management of flywheel angular momentum is achieved, and the problem of flywheel. speed passing zero and momentum saturation are solved in some degree by adjusting the weighted matrix. At last, the satellite attitude simulation is presented to prove validation of the torque allocation algorithm. [ABSTRACT FROM AUTHOR]