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Dynamic Modelling and Control of a Double Tethered Towing System for Flexible Non-Functional Satellites Removal

Sajadi Monfared, Ali | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56103 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Assadian, Nima
  7. Abstract:
  8. Space debris have increasing importance for space missions. The towing removal scheme is one of the most promising ways for active removal of these debris from LEO orbits. In this approach, an active propelled satellite captures the debris via a space tether and a tethered net which by producing a force opposite to its velocity, it will cause deorbiting and burning the debris in the dense atmosphere. One of the issues with this technique is the danger of tether rupture which for solving that two tethers instead of one can be used. In this research study of active removal of flexible space debris via double tethered towing system has been done. Dynamic modeling has been done with Newton’s and Lagrange’s methods. And for decreasing flexible panels infinite degrees of freedom, Galerkin and assumed mode methods have been used and the results have been compared. Also for attitude control of the active satellite, sliding mode control has been used. The results show the good performance of controller in nominal and off-nominal conditions. Analysis showed that changing the magnitude of thrust force, elasticity, and damping of tethers doesn’t have a considerable effect on attitude dynamic behavior of the debris. Also by Monte Carlo simulation, it was cleared that the place of tether attachment points to the debris does have a great effect on its libration amplitude. But overall its disturbing effect on active satellite’s attitude control is bounded
  9. Keywords:
  10. Sliding Mode Control ; Flexible Satellites ; Active Debris Removal Mission ; Space Debris ; Towing Removal ; Coupled Rotational and Translational Motion ; Dynamic Modeling

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