Autors: Yordanova, S. T. Title: A Frequency Domain Approach for Design of Stable Fuzzy Logic Systems with Parallel Distributed Compensation Keywords: Frequency response, Fuzzy logic control system design, Nyquist plot, Parallel distributed compensation, Real time temperature control, TakagiSugenoKang plant model, Nonlinear system stability Abstract: Most industrial processes are nonlinear, multivariable, with time delay, variable parameters and model uncertainty, subjected to disturbances. There exist methods that compensate the impact of these plant peculiarities but are developed for linear control systems. Most of them are based on the system frequency response since they give a compact and easy design solution. A novel frequency domain approach is suggested for the design of fuzzy logic nonlinear systems with parallel distributed compensation (PDC) from requirements for global nonlinear system stability, robustness and good performance. It uses modified transfer functions based TakagiSugenoKang (TSK) plant model and PDC and the merits of the linear control frequency design methods. The modified PDCTSK system is represented by a number of equivalent linear systems for which equivalent frequency responses are defined and frequency domain design criteria applied to ensure stability, robustness and desired performance. References Issue

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