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Multivariable gain-scheduled fuzzy logic control of an exothermic reactor

DSpace at IIT Bombay

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Title Multivariable gain-scheduled fuzzy logic control of an exothermic reactor
 
Creator SARMA, P
 
Subject internal model control
control-systems
stability
plant
exothermic
fuzzy logic
offset
gain-schedule
reactor
scaling gain
 
Description Fuzzy logic control frequently exhibits superior performance to classical linear controllers even for 'hard', mathematically well defined plants, as described in this paper. The case-study of a highly nonlinear exothermic continuous stirred tank reactor, which poses a multivariable control problem with two interacting loops and open-loop instability, is used. The behaviour of the fuzzy logic controller is compared with that of a PID controller. A smooth. easily tuneable gain-schedule is designed to handle offset-like problems with a fuzzy controller. It is analytically shown that such a gain-schedule is the simpler, intuitive equivalent of a manipulation of the corresponding fuzzy membership functions. The fuzzy controller structure chosen is a parsimonious one, with the choice of Gaussian bell-shaped membership functions generating a smooth input/output surface with nontrivial inferencing spanning the entire input space. This provides a clear, non-heuristic reason to select Gaussian over triangular shapes for membership functions. The gain-scheduled fuzzy controller shows excellent control performance, significantly outperforming the PID controllers in both servo and regulatory modes. The disturbance rejection behaviour of the modified fuzzy controller is observed to be particularly good. (C) 2002 . .
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-25T15:30:39Z
2011-12-26T12:57:07Z
2011-12-27T05:46:56Z
2011-08-25T15:30:39Z
2011-12-26T12:57:07Z
2011-12-27T05:46:56Z
2001
 
Type Article
 
Identifier ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE, 14(4), 457-471
0952-1976
http://dx.doi.org/10.1016/S0952-1976(01)00003-3
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11061
http://hdl.handle.net/10054/11061
 
Language en