Fuzzy logic control of an unstable biological reactor | Zendy

Inamdar Satish R. | Zendy; Chiu MinSen | Zendy

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Fuzzy logic control of an unstable biological reactor

Author(s) -

Inamdar Satish R.,

Chiu MinSen

Publication year - 1997

Publication title -

chemical engineering and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.403

H-Index - 81

eISSN - 1521-4125

pISSN - 0930-7516

DOI - 10.1002/ceat.270200609

Subject(s) - control theory (sociology) , fuzzy logic , nonlinear system , controller (irrigation) , work (physics) , steady state (chemistry) , mathematics , variable (mathematics) , servo , engineering , control engineering , computer science , control (management) , physics , chemistry , artificial intelligence , mathematical analysis , mechanical engineering , quantum mechanics , agronomy , biology

In the present work, we employ a fuzzy logic controller (FLC) to control the unstable state of a nonlinear biological reaction. The state variable vectors consist of cell density and substrate concentration. The dilution rate is used as a manipulated variable to control the reaction dynamics. An analytic form of FLC employing Zadeh AND logic along with Center of Mass defuzzification method is considered. Simulations reveal that for servo response test, the FLC shows satisfactory performance for natural unsteady states for which a conventional PI controller is known to fail. Further simulations also show that the FLC gives satisfactory regulatory response and is relatively insensitive to the deviations in model parameters.

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