DYNAMICS AND CONTROL OF THE WISP SHUTTLE-ANTENNAE SYSTEM

This paper deals with the dynamics and control of planar spin-up and s lewing of the Space Shuttle carrying two 150 meter long, flexible ante nna booms. An order-n formulation of the dynamical equations based on a model that facilitates a study of large deflection of beams is given . A recently developed theory of dead-beat control for vibration suppr ession is applied for the spin-up and slewing maneuvers. Open loop con trol of spin-up is achieved with small residual vibration. Slewing thr ough 90 degrees in less than sixteen minutes is demonstrated by combin ing input shaping with closed loop control. Robustness of the control to modeling errors in frequency is illustrated.