Control of a system in the presence of flexible modes
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The primary research objective is to investigate the control of flexible space structures - mobile satellite communication systems in particular. Solar-powered satellites require a high level of accuracy in attitude stabilization and large-angle maneuvering. Furthermore, they have to be least sensitive to disturbances affecting the structure, possibly coming from several sources, such as mechanical vibrations due to flexible panels appended to the spacecraft. In this thesis, we address the problem of robust adaptive disturbance rejection in a control system of a flexible structure. The intent is to guarantee stability and maximum rejection of the disturbances. For the achievement of this purpose, a Linear Quadratic Gaussian (LGQ) controller is designed using Loop Transfer Recovery (LTR) in order to increase the robustness of the system. A second approach is to design a nonminimum-phase structural filter and to examine its effect on the system's stability.
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Vibration Reduction for Flexible Spacecraft Attitude Control Using PWPF Modulator and Smart Structures Song, Gangbing; Agrawal, Brij N. (1999);This paper presents a new approach to vibration reduction of flexible spacecraft during attitude control by using Pulse Width Pulse Frequency (PWPF) Modulator for thruster firing and smart materials for active vibration ...
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