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Satellite Attitude Control with Consideration of the Fuel Sloshing Dynamics

Haghparast, Behfar | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53567 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Salarieh, Hassan; Nejat Pishkenari, Hossein
  7. Abstract:
  8. Modeling and Controlling of a satellites fuel slosh is considered a vital problem in the field of satellite attitude control. In this paper modeling and control of the attitude of a satellite carrying a partially filled spherical fuel tank, which uses the diaphragm as a propellant management device (PMD), has been studied. The fuel slosh dynamics is modeled using a spherical pendulum with two degrees of freedom and a rigid arm, which represents the first mode of sloshing. The effects of the diaphragm that surround the fuel surface, are considered as torsional springs and dampers attached to the satellite body. The combined dynamics equations of the satellite rigid motion and the fuel slosh motion are attained using the Lagrange method considering six degrees of freedom for the satellite rigid body and two degrees of freedom for the fuel. The nonlinear control method based on the back-stepping method (back-stepping method, back-stepping sliding mode, adaptive back-stepping sliding mode) is used for the control of the satellite attitude. The stability of the controllers has been proved using Lyapunov functions. Since fuel state variables cannot be measured as system output, and because the controller design requires fuel state variables, a nonlinear observer based on the Thau method is provided to access the fuel state variables. But because the Thau observer is only able to estimating fuel state variables and cannot estimate fuel parameters, a cubature Kalman filter is proposed that, in addition to estimating fuel state variables, also estimates fuel model parameters. Finally, the performance of the proposed controllers and observers are evaluated using the numerical simulations
  9. Keywords:
  10. Satellites ; Nonlinear Observer ; Kalman Filters ; Nonlinear Control ; Spherical Pendulum ; Fuel Sloshing ; Satellite Attitude Control ; Back-Stepping Method ; Thau Observer ; Adaptive Back-Stepping Sliding Mode

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