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Chaotic and Oscillatory Behavior Analysis and Control of a Bioreactor

Hoseinzadeh, Leila | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42423 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shahrokhi, Mohammad
  7. Abstract:
  8. In this thesis, a bioreactor with oscillatory and chaotic behavior has been studied and a control method has been proposed. This bioreactor shows oscillations for some special values of its parameters. The system dynamic is chaotic when a forced perturbation on the feed concentration is imposed. Dynamic behavior of this oscillatory and chaotic reactor has been illustrated. The main objective is control of product concentration. To do this, first system control is considered by proposing several control strategies for SISO case, then system in MIMO case is studied for achieving a globally controllable system. In SISO case, the performances of controllers are compared based on an objective function under the same conditions. Simulations results show that all of the proposed strategies have acceptable performances, though adaptive generalized predictive control (AGPC) has the most desired performance regarding robustness features, for SISO system. It is proved that the SISO system is not controllable in some regions; therefore by adding another manipulated variable, the system becomes controllable in all domains. To control the multi input system a state feedback controller based on the process linearized model has been proposed. The suggested controller possesses integral action on desired concentration to eliminate the offset. In this case only concentration of product is controlled. Afterwards a MIMO sliding mode control is proposed to control product and substrate concentration simultaneously. Results indicate that this controller operates in an acceptable manner. For controllers which require system states for their implementation, state observer has been designed and incorporated into the control system
  9. Keywords:
  10. Chaos Theory ; Control ; Bioreactor ; Multi-Input Systems ; Observer ; Volatility

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