Design of Fuzzy Logic Controller for a Spherical tank system and itsReal time implementation

摘要

A real time implementation of Fuzzy logic controller (FLC) for a spherical tank to control liquid level is studied. Control of liquid level in a spherical tank is highly non linear due to variation in the area of cross section of level system with change in shape .System identification of spherical tank system is done using black box model which is identified to be non linear and approximated to be a First order plus dead time model .Here the conventional PI controller parameters are designed based on Ziegler-Nicholas method and its servo & regulatory responses are compared with Fuzzy logic controller based on mamdani model. The real time implementation of the process is designed and implemented in MATLAB using VMAT-01 Data Acquisition Module .It is observed from the results of Fuzzy Logic controller out performs in no overshoot, faster settling time, better set point tracking and produces lower performances indices like Integral square error(ISE)