Author:
Kifayat Mammadova, Matanat Hasanquliyeva Kifayat Mammadova, Matanat Hasanquliyeva
Abstract
The proposed synthesis algorithm for a fuzzy – logical proportional – differential (Fuzzy PD) controller is a simple and allows using a standard form of description of linguistic variables and a minimum set of control rules (with number of three or five rules). One of the successful applications that used fuzzy control is liquid tank level control. The purpose of the proposed synthesis algorithm is to design a simulation system of fuzzy logic controller for liquid tank level control by using simulation package which is Fuzzy Logic Toolbox and Simulink in MatLab software. By doing some modification of this algorithm, the design will be very useful for the system relates to liquid level control that widely used in industry nowadays.
The influence of its barbecues on the process obtained by synthesis with a PD controller is shown. It became clear that by selecting coefficients, we could get high-speed transitions and the required quality without extreme settings. It was not possible to obtain the required process using a fuzzy controller of 3 rules. This is because the price of the derivative, that is, the rate of change in the liquid level in the tank, is not taken into account. This was taken into account in the fuzzy controller and a time adjustment of no more than 10 seconds was obtained. Fuzzy controller of 5 rules and copy of PD-controller - normalization of input and output gave close results in terms of quality and accuracy.
Keywords: controller, fuzzy logic controller, linguistic rules, fuzzification, defuzzification, liquid tank, toolbox, Simulink, PD – controller, overshoot, steading.
Publisher
Education Support and Investment Fund NGO
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