Abstract: The paper proposes a new development method dedicated to a class of fuzzy control systems containing Takagi-Sugeno PI-fuzzy controllers to control SISO linear / linearized plants. The considered controllers are characterized by variable number of triangular input membership functions. The method is expressed in terms of relatively simple steps that use the prediction of the limit cycles on the basis of the gain-phase margin analysis and on the design results from the linear case. The method is applied to the development of a class of PI-fuzzy controllers for servo systems, and it is accompanied by the sensitivity analysis with respect to the parametric variations of the controlled plant and validated by a case study.
Stefan Preitl was born in Timisoara, Romania, in 1943. He received the Dipl. Eng. degree in Electrical Engineering, and the Ph.D. degree in Measurement Techniques from the "Traian Vuia" Polytechnic Institute of Timisoara in 1966 and 1983, respectively. He is a Professor in the Department of Automation and Applied Informatics of the "Politehnica" University of Timisoara since 1992, and doctoral supervisor in Automation since 1990. He published more than 170 papers in scientific journals, refereed conference proceedings and contributions to books in the field of Automatic Control. His research interests are conventional and advanced structures and algorithms for automatic control applied to power systems or servo-systems, control systems of electrical drives, methodical aspects of teaching and development of computer-assisted education. Prof. Preitl is vice-president of the Romanian Society of Control Engineering and Technical Informatics (SRAIT), member of IEEE, honorary member of the Hungarian Fuzzy Association and member of the IFAC Technical Committee on Control Design.
Radu-Emil Precup was born in Lugoj, Romania, in 1963. He received the Dipl. Eng. degree in Automation and Computers from the "Traian Vuia" Polytechnic Institute of Timisoara in 1987, the diploma in Mathematics from the West University of Timisoara in 1993, and the Ph.D. degree in Automatic Systems from the "Politehnica" University of Timisoara (PUT), Romania, in 1996. After gaining industrial experience at the Infoservice SA, Timisoara, he joined the PUT in 1991, where he is currently a Professor in the Department of Automation and Applied Informatics and doctoral supervisor in Automation since 2004. His research interests include development and analysis of intelligent control systems, computer-aided design of control systems, modelling and optimisation, where he has authored or co-authored several books and over 120 papers in scientific journals, refereed conference proceedings and contributions to books. Prof. Precup is member of IEEE, honorary member of the Hungarian Fuzzy Association and of the IFAC Technical Committee on Cognition and Control.
