Boots – shoes – and leggings
Patent
1994-05-13
1997-03-11
Malzahn, David H.
Boots, shoes, and leggings
36472401, G06F 1710
Patent
active
056108486
ABSTRACT:
A method for filtering actuator commands for a satellite control system to reduce resonant mode excitation despite uncertain knowledge of the resonance frequencies, due to parameter variations, nonlinearities, and the like. The present method filters the actuator commands with staggered proportional plus delay (posicast) filters having distinct delay values, chosen to provide a desired resonance attenuation over a resonance uncertainty range. The present method may be extended to filter multiple resonances by cascading the staggered filters for each resonance. The present invention has wide application, such as in spacecraft precession and translation maneuvers, as well as gimbaled payload stepping. A particular advantage of the present invention is its direct applicability to fixed-amplitude actuators (such as thrusters and stepper motors), and reduced excitation of resonances at frequencies above those of primary concern.
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Denson-Low Wanda K.
Gudmestad Terje
Hughes Aircraft Company
Malzahn David H.
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