Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1992-06-25
1993-11-02
Barefoot, Galen
Aeronautics and astronautics
Spacecraft
Attitude control
244169, B64G 124
Patent
active
052578020
ABSTRACT:
A method is disclosed wherein a flexible space craft may be slewed by the application of positive and negative acceleration forces applied about a slewing axis. The method is such that at the end of the application of the slewing forces there is no residual energy in the excited modes. By examination of the response of an undamped and then damped structural mode to a sequence of step forces--entirely within the premises of structural dynamics discipline--a minimum-time zero-residual-energy torque profile with unequal intervening pulses is arrived at heuristically. Rigorous yet simple relationships are then established among the maneuver angle of a rest-to-rest slew, slew time, widths of the intervening pulses, and natural frequency and damping of a critical mode whose energy at the end of slew must be zero.
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Barefoot Galen
Garfinkle Irwin P.
Singer Donald J.
The United States of America as represented by the Secretary of
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