Command shaping for a flexible satellite platform controlled by advanced fly-wheels systems |
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| Institution: | 1. ESA, Advanced Concepts Team, ESTEC Keplerlaan 1, Postbus 299, 2200 AG, Noordwijk, The Netherlands;2. Center of Applied Space Technology and Microgravity, University of Bremen, Germany;1. Beijing Institute of Technology, School of Aerospace Engineering, 100081 Beijing, People''s Republic of China;2. Beijing Institute of Control Engineering, National Laboratory of Space Intelligent Control, 100094 Beijing, People''s Republic of China;1. Department of Industrial Engineering, The University of Jordan, Amman 11942, Jordan;2. Engineering Systems & Management, Masdar Institute of Science & Technology, United Arab Emirates |
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| Abstract: | In this paper we consider the coupling between the flexibility of a spacecraft equipped with variable speed control moment Gyros and its attitude control system, in the framework of command shaping techniques. The analysis is performed on the set of equation of motion written in an explicit form describing a flexible platform and N wheels gimballed to it. The attitude control system is designed upon a Lyapunov based feedback relying upon a rigid body model. Whenever the structure is not stiff enough, flexibility degrades the performances of the controller that fails to track the desired history. We therefore study the possibility of altering the tracking signal fed to the controller trying to get rid of the relevant frequencies notch filtering them in order to reduce vibrations. The results obtained for a test case attitude acquisition maneuver are presented and the benefit deriving from the command shaping technique evaluated and discussed. |
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