Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1991-06-24
1993-11-16
Barefoot, Galen
Aeronautics and astronautics
Spacecraft
Attitude control
B64G 128
Patent
active
052616312
ABSTRACT:
Method and apparatus for controlling the two-axis rate and position as well as the linear elevation of a momentum wheel platform supported by three jackscrews driven by stepper motors. By tilting the momentum wheel, a control torque is produced in the plane orthogonal to the nominal wheel spin axis. When all three actuators are operational, the control transformations are made unique by constraining the sum of the actuator extensions to be zero. When one actuator has failed, the above constraint is eliminated and the failed actuator is constrained to its measured value. Momentum wheel platform rotational rate commands generated by the roll/yaw control system are first integrated to give desired gimbal angles, and then transformed into jackscrew extensions. Jackscrew step commands are computed as the difference between these desired extensions and the current positions of the jackscrews. The position of each jackscrew is maintained by accumulating the step commands. The desired extensions are also back-transformed to compute gimbal angles that are fed back to the roll-yaw state control system. In ground commanded stepping, the momentum wheel platform steering method operates exactly as described above, except that relative jackscrew step commands from a ground station are utilized instead of the step commands computed in the rate following configuration.
REFERENCES:
patent: 3452948 (1969-07-01), Kukel et al.
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patent: 3741500 (1973-06-01), Liden
patent: 4052654 (1977-10-01), Kramer et al.
patent: 4919382 (1990-04-01), Forman
patent: 5112012 (1992-05-01), Yuan et al.
John Dzielski "Approach to Control Moment Gyroscope Steering Using Feedback Linearization" 169a Journal of Guidance Control and Dynamics 14 (1991) Jan./Feb., No. 1.
European Search Report EP 92 10 7719.
Bender Douglas J.
Brehove James D.
Barefoot Galen
Denson-Low Wanda K.
Hughes Aircraft Company
Lindeen III Gordon R.
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