Double-command fuzzy control of a nonlinear CSTR

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In this research, double-command control of a nonlinear chemical system is addressed. The system is a stirred tank reactor; two flows of liquid with different concentrations enter the system through two valves and another flow exits the tank with a concentration between the two input concentrations. Fuzzy logic was employed to design a model-free double-command controller for this system in the simulation environment. In order to avoid output chattering and frequent change of control command (leading to frequent closing-opening of control valves, in practice) a damper rule is added to the fuzzy control system. A feedforward (steady state) control law is also derived from the nonlinear mathematical model of the system to be added to feedback (fuzzy) controller generating transient control command. The hybrid control system leads to a very smooth change of control input, which suits real applications. The proposed control system offers much lower error integral, control command change and processing time in comparison with neuro-predictive controllers.

Original languageEnglish
Pages (from-to)19-31
Number of pages13
JournalKorean Journal of Chemical Engineering
Volume27
Issue number1
DOIs
Publication statusPublished - Jan 2010

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Fuzzy control
Control systems
Controllers
Plant shutdowns
Fuzzy logic
Flow of fluids
Mathematical models
Feedback
Processing

Keywords

  • CSTR
  • Fuzzy Control
  • Hybrid Control
  • Nonlinear System
  • Steady State Control

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Double-command fuzzy control of a nonlinear CSTR. / Mohammadzaheri, Morteza; Chen, Lei.

In: Korean Journal of Chemical Engineering, Vol. 27, No. 1, 01.2010, p. 19-31.

Research output: Contribution to journalArticle

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