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Actuator Failure-Tolerant Predictive Control of an All-Thruster Satellite in Coupled Translational and Rotational Motion using Neural Networks

Tavakoli, Mohammad Mahdi | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 51381 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Asadian, Nima
  7. Abstract:
  8. In this thesis, the problem of failure-tolerant control of the satellite in coupled orbital and rotational motion is investigated. All of the actuators of the satellite are thrusters and only the failure of the actuators is considered. At first, the equations of coupled relative translational-rotational motion of the satellite are derived. Then, the required specifications of the approapriate control method for the problem is explored with the conclution that the controller must be able to predict the behavior or planning the future trajectory of the satellite. In the next step, model predictive control, which has the required specifications, is used to control the coupled translational-rotatioal motion of the satellite without any failure and/or fault. In the main section of the thesis, neural network is used in such a way that the model predictive controller can recover the thruster failure. To this end, after modelling the failure and fault of the thrusters, a static neural network is used to detect and quantify the thrusters faults and/or failures online. In this way, the neural network updates the model of the satellite in the model predictive control and thus, maintains the functionality of the controller and prevents unstability. In the next stage, the numerical integration of satellite model for the prediction stage of the controller is replaced with a dynamic neural network. The effectiveness of these approaches is shown with numerical simulations
  9. Keywords:
  10. Model Predictive Control ; Neural Network ; Satellite Control ; Fault-tolerant Control ; Six Degree of Freedom Satellite Control ; All-Thruster Satellite

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