Plenary Lecture, SIGNAL PROCESSING, ROBOTICS and AUTOMATION (ISPRA '09), Cambridge, UK, February 21-23, 2009

Plenary Lecture

On Some Properties of Fuzzy Systems


Professor Constantin Volosencu
Department of Automatics and Applied Informatics
Faculty of Automatics and Computers
“Politehnica” University of Timisoara
Bd. V. Parvan nr. 2
Timisoara, 300223

Abstract: The paper presents a short review of some main properties of fuzzy systems useful in control. Fuzzy rule bases and fuzzy systems may be seen as applications between real or fuzzy sets. They have algebraic properties as commutative law, neutral element and symmetric elements. The fuzzy systems, implemented using different rule bases, fuzzy values, membership functions, fuzzyfication and defuzzification methods have sector property. The paper is emphasising a spatial sector property, useful in stability analysis with Lyapunov techniques. The fuzzy systems may be characterised with SISO and MIMO transfer characteristics. These transfer characteristics are used in the pseudo-equivalence of the fuzzy PI controllers with linear PI controllers. The paper presents a way to use translated SISO transfer characteristics and gain characteristics of fuzzy blocks in the design of fuzzy control systems and stability analysis. Based on transient characteristics of fuzzy control systems some quality criteria are presented.

Brief Biography of the Speaker:
Prof. Constantin Volosencu graduated in 1981 the Faculty of Electrotechnics, “Traian Vuia” Polytechnic Institute of Timisoara, Romania, as an engineer in automatics and computers and he is doctor in control systems at “Politehnica” University of Timisoara. In present he is professor at “Politehnica” University of Timisoara, Faculty of Automatics and Computers, Department of Automatics and Applied Informatics. His research interest is in linear control systems, fuzzy control, neural networks, control of electrical drives, modelling, simulation, identification and sensor networks. He is author of 9 books and more then 100 scientific papers, published at international conferences and journals. He was manager of over 30 national an international research projects.
Constantin Volosencu worked from 1981 to 1990 at “Electrotimis” Enterprise Timisoara, in the field of the control systems for industrial machines, where he developed control equipments for a large scale of machineries, which are the objects of 27 patents.


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