Performance Evaluation of Fuzzy based Water bath System with Variation in Number of Linguistic Variables and Membership Function Range

Abstract

The proposed work describes the designing of water bath system based on fuzzy logic and
performance evaluation of fuzzy logic controller in Water-Bath temperature control system using SIMULINK
and MATLAB Fuzzy Logic Toolbox. The motto of this paper is using fuzzy logic for controller design which
outperforms conventional controllers like PID and gives water-bath output with maximum smoothness,
uniformity and minimum overshoot. Performance evaluation has been done for this system using Triangular and
Gaussian membership function. Number of linguistic variable (fuzzy sets) used are nine and eleven for each
membership function. Also each membership function is tested with MF base range width 0.8 and 1. The
evaluation is done for the parameters rise time, settling time, overshoot. The fuzzy inference used is of
MAMDANI type and centre of gravity (COG) technique used for defuzzification.