Boots – shoes – and leggings
Patent
1990-07-13
1992-07-14
Chin, Gary
Boots, shoes, and leggings
244164, 244171, B64G 126
Patent
active
051309319
ABSTRACT:
A spacecraft attitude and/or velocity control system includes a controller which responds to at least attitude errors to produce command signals representing a force vector F and a torque vector T, each having three orthogonal components, which represent the forces and torques which are to be generated by the thrusters. The thrusters may include magnetic torquer or reaction wheels. Six difference equations are generated, three having the form ##EQU1## where a.sub.j is the maximum torque which the j.sup.th thruster can produce, b.sub.j is the maximum force which the j.sup.th thruster can produce, and .alpha..sub.j is a variable representing the throttling factor of the j.sup.th thruster, which may range from zero to unity. The six equations are summed to produce a single scalar equation relating variables .alpha..sub.j to a performance index Z: ##EQU2## Those values of .alpha. which maximize the value of Z are determined by a method for solving linear equations, such as a linear programming method. The Simplex method may be used. The values of .alpha..sub.j are applied to control the corresponding thrusters.
REFERENCES:
patent: 3866025 (1975-02-01), Cavanagh
patent: 4537375 (1985-08-01), Chan
patent: 4599697 (1986-07-01), Chan et al.
patent: 4758957 (1988-07-01), Hubert et al.
patent: 4961551 (1990-10-01), Rosen
"An Advanced Spacecraft Autopilot Concept", by Edward V. Bergmann et al. Journal of Guidance and Control, May-Jun. 1979, vol. 2, No. 3, Article No. 77-1071, pp. 161-168.
Paluszek Michael A.
Piper, Jr. George E.
Berard Clement A.
Chin Gary
General Electric Company
Meise William H.
Young Stephen A.
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