Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1991-07-19
1993-04-13
Barefoot, Galen
Aeronautics and astronautics
Spacecraft
Attitude control
364434, 364459, 244170, B64G 128
Patent
active
052018334
ABSTRACT:
A spacecraft attitude control system uses one or more momentum or reaction wheels. Wheel bearing viscous (velocity-dependent) friction reduces the actual torque imparted to the spacecraft in response to a torque command signal. Friction compensation is provided by applying the torque command signal to a model of an ideal, friction-free wheel, and calculating the speed which the ideal wheel achieves in response to the torque command. An error signal is generated from the difference between the ideal wheel speed and the actual wheel speed. The error signal is summed with the torque command signal to produce the wheel drive signal. This results in a closed-loop feedback system in which the actual wheel speed tends toward the ideal wheel speed, thereby causing a torque on the spacecraft which is substantially equal to that commanded.
REFERENCES:
patent: 3998409 (1976-12-01), Pistiner
patent: 4260942 (1981-04-01), Fleming
patent: 5020745 (1991-06-01), Stetson, Jr.
patent: 5058835 (1991-10-01), Goodzeit et al.
Cohen Walter J.
Goodzeit Neil E.
Paluszek Michael A.
Barefoot Galen
Berard Clement A.
General Electric Company
Meise William H.
Young Stephen A.
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