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Robust Control of Flexible Satellite in Rendezvous and Docking with Thruster Actuators

Abbasi, Roohollah | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52394 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Asadian, Nima
  7. Abstract:
  8. The primary purpose of this research is to model, control and simulate a flexible and fully actuated satellite, equipped with twelve on-off thruster actuators, in rendezvous and docking maneuver. Flexibility of the satellite is modeled by considering two flexible and asymmetrical multi section solar panels with rotational springs and dampers in joints, attached to a central rigid body. Solar panel sections have been modeled in the form of Euler-Bernoulli beam by using assumed mode method and taking into account finite bending mode-shapes. The governing differential equations are obtained using Lagrange method. Then, the dynamic model is validated by comparing the simulation results of the model with the NX Siemens modelling software results. After that, sliding mode controller is used for robust coupled attitude and position control of a satellite in rendezvous and docking, in presence of parametric and modeling uncertainties. Dynamic of on-off thruster have also considered and vibration of flexible parts of satellite have been controlled. Computed control commands using the integral sliding mode control law has been allocated to the thrusters by control assignment algorithm. Then PWPF modulator turned it into on-off signal commands. The results obtained from different scenarios and Monte-Carlo simulation, show the efficiency of the sliding mode control for the flexible satellite in rendezvous and docking maneuvers. In addition, it has been shown that the proposed controller can minimize the vibration of flexible parts in presence of uncertainties such as modeling errors and external disturbances
  9. Keywords:
  10. Robust Control ; Rendezvous and Docking Problem ; Uncertainty ; Fully Actuates Satellite ; Thruster

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