Refined dynamical analysis of multi-tethered satellite formations |
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| Institution: | 1. Università del Salento, Department of Engineering, 73100 Lecce, Italy;2. Universitat Politècnica de Catalunya, Escola d''Enginyeria de Telecomunicació i Aeroespacial de Castelldefels (EETAC), 08860 Castelldefels, Spain;1. National Key Laboratory of Aerospace Flight Dynamics, Northwestern Polytechnical University, Xi''an 710072, China;2. Research Center for Intelligent Robotics, School of Astronautics, Northwestern Polytechnical University, Xi''an 710072, China;3. No. 203 Research Institute, China Ordance Industries, Xi''an 710065, China;1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, Jiangsu, China;2. Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada |
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| Abstract: | The dynamics of a multi-tethered satellite formation is considered here, in order to derive a minimum complexity model that successfully represents its dynamics under the action of gravity gradient force and tether tension, where tethers are modeled by means of a sequence of point-masses and massless springs (bead model). The results thus obtained are compared with those derived for a simple, massless tether model, in order to highlight the effects of tether mass on the resulting open-loop behavior. The analysis is performed by means of numerical simulation of the considered models. Once the dynamic behavior of the formation is identified for the nominal values of tether characteristics, the problems raised by the presence of tether mass are highlighted and possible solutions are outlined, when possible. A parametric analysis with respect to the tether linear mass, damping and stiffness is also discussed. |
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