Hybrid equations for translational and rotational motion of flexible spacecraft

Equations of motion of a generic spacecraft with a rigid main body, and with flexible appendages, rotors, and jets on or in the main body were obtained by hybrid coordinate modeling. The equations were linearized to obtain the motion equations of three-axis stabilized spacecraft. The reduction of the exact motion equations to those describing the motion of a multibody spacecraft, composed of rigid main body with finite moments of inertia and of point masses with zero moments of inertia, is outlined.