Abstract
The effects of multi-body dynamic interaction on attitude control and momentum management of the Space Station Freedom are investigated with emphasis on the impact of the Mobile Remote Manipulator System and Mobile Transporter operations. In particular, the peformance and stability of both classical and modern controllers are evaluated by nonlinear simulations of a rigid, two-body vehicle with prescribed motion of the second body relative to the core body. It is shown that the Mobile Transporter maneuver with a large payload can affect the overall system response significantly and in certain cases the Space Station control system can become unstable. The instability, caused by more than 30% changes in the overall inertia property, indicates a need for an adaptive control or gain scheduling for the large payload maneuvers.
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