Technical communique: Identification of dynamical systems with a robust interval fuzzy model

  • Authors:
  • Igor ŠKrjanc;SašO Blaič;Osvaldo Agamennoni

  • Affiliations:
  • Faculty of Electrical Engineering, University of Ljubljana, Traška 25, 1000 Ljubljana, Slovenia;Faculty of Electrical Engineering, University of Ljubljana, Traška 25, 1000 Ljubljana, Slovenia;Universidad Nacional del Sur, Bahia Blanca 8000, Argentina

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2005

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Abstract

In this paper we present a new method of interval fuzzy model identification. The method combines a fuzzy identification methodology with some ideas from linear programming theory. On a finite set of measured data, an optimality criterion that minimizes the maximal estimation error between the data and the proposed fuzzy model output is used. The idea is then extended to modelling the optimal lower and upper bound functions that define the band that contains all the measurement values. This results in a lower and an upper fuzzy model or a fuzzy model with a set of lower and upper parameters. The model is called the interval fuzzy model (INFUMO). The method can be used when describing a family of uncertain nonlinear functions or when the systems with uncertain physical parameters are observed. We believe that the fuzzy interval model can be very efficiently used, especially in fault detection and in robust control design.