Publisher : Institute of Control, Robotics and Systems
DOI : 10.5302/J.ICROS.2015.15.0166
Title & Authors
Attitude Control of Spacecraft by Two Variable-Speed Control Moment Gyros Jin, Jaehyun;
For the attitude control of spacecraft, two variable-speed control moment gyros are proposed as main actuators in the article. Since a variable-speed control moment gyro (VSCMG) makes two control torques (gyroscopic torque and reaction torque), two VSCMGs are sufficient for controlling 3-axes attitude. Additionally, there are no singular conditions for two non-parallel VSCMGs. Since gyroscopic torque is usually much greater than reaction torque, the control performances of approximately 3 axes may not be the same. However, several missions can be accomplished by controlling two axes. For such missions, a selective axes control method is proposed. The method selects two axes for a certain task and controls the attitude of the selected axes. For the remaining axis, angular speed is controlled for stabilization. A hardware-in-the-loop simulation has been used to test VSCMG modules and to verify the proposed method. Two VSCMGs can be alternative actuators for small satellites.
variable speed control moment gyro;spacecraft attitude control;selective axes control;hardware in the loop simulation;
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