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Translational and Rotational Dynamics and Control Of an All-Thruster Satellite Considering Fuel Slosh

Jalali Farahani, Mahan | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52719 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Assadian, Nima
  7. Abstract:
  8. The purpose of the present study is to model and control a 6DOF satellite dynamics with a rigid body in the Earth’s orbit including the fuel slosh. The satellite manages and controls its attitude and position by twelve ON-OFF thrusters installed alongside the principal body axes. Moreover, due to using the liquid fuel to feed these thrusters, fuel slosh may have a strong dynamical effect on the satellite translational and rotational dynamics and control. The thrusters’ activation may result in fuel slosh and the impact of their frequent switching ON-OFF on fuel is considered in this study. The thrusters force magnitude, switching intervals, and their frequencies can affect the magnitude of fuel slosh which is controlled by proper control actions. Attitude and position sensors are modeled ideally and only the effect of the noise on their output is considered. Furthermore, to increase the accuracy and reliability of the results, attitude and orbital perturbation are included in modeling. In this thesis, such effects are controlled by sliding mode controls as possible after modeling the 6DOF satellite with fuel slosh. The result of numerical simulation from the sliding mode controller shows that the attitude, position, and fuel slosh are successfully controlled
  9. Keywords:
  10. All-Thruster Satellite ; Fuel Sloshing ; Sliding Mode Control ; Rotational Dynamic ; Six Degree of Freedom Satellite Control ; Translational Motion ; Relative Motion

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