MAE142_L21_SpaceControl.pdf - Spacecraft Control Open-Loop...

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Spacecraft Control Open-Loop Attitude Maneuvers Closed-Loop Attitude Control Hubble Space Telescope MAE 142 NASA Image: Hubble Space Telescope 1 2 3
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2 MAE 142 Space Shuttle Control System Stone, H.W. and Powell, R.W., "Effect of Aerodynamic and Angle- of-Attack Uncertainties on the Blended Entry Flight Control System of the Space Shuttle from Mach 10 to 2.5", NASA TP-2283, 1984. Restrepo, C. and Valasek, J., "Preliminary Study Using Forward Reaction Control System Jets During Space Shuttle Entry", Paper 2006-6073, AIAA Guidance, Navigation, and Control Conference and Exhibit, 2006
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3 MAE 142 SAMPEX State Model x = [ 1 2 3 r N 1 N 2 N 3 ] Angular rate about 1-axis [rad/s] Angular rate about 2-axis [rad/s] Angular rate about 3-axis [rad/s] Reaction wheel angular rate [rad/s] Disturbance torque about 1-axis [N] Disturbance torque about 2-axis [N] Disturbance torque about 3-axis [N] ˙ 1 = I 22 I 33 I 11 2 3 I r I 11 3 r N 1 I 11 ˙ 2 = I 33 I 11 I 22 1 3 N 2 I 22 ˙ 3 = I 11 I 22 I 33 1 2 I r I 33 1 r N 3 I 33 ˙ r = 0 ˙ N 1 = 0 ˙ N 2 = 0 ˙ N 3 = 0 ˙ x t = f [ x t ] I 23 = 0 note (for simplicity):
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4 MAE 142 Open-Loop Attitude Maneuvers Consider a “bang-bang” control law to change the pitch attitude of a spacecraft.
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