充液飞行器大角度操纵变结构控制

VARIABLE-STRUCTURE CONTROL OF LIQUID-FILLED SPACECRAFT LARGE-ANGLE MANEUVERS

The liquid-filled spacecraft large-angle maneuver problem is investigated using the principles of variable-structure control theory. A control law, that constrains the state to follow the sliding mode in the state space, is designed on the basis of a nonlinear, simplified model of the completely liquid-filled spacecraft dynamics. The sliding mode is obtained by solving an optimal control problem posed in a reduced space, the solution being the angular velocities of the spacecraft as functions of the attitude variables. It is shown that the motion along the sliding mode is insensitive to parameter variations and unmodeled effects.