H∞ output feedback control design for uncertain fuzzy singularly perturbed systems: an LMI approach

  • Authors:

  • Wudhichai Assawinchaichote;Sing Kiong Nguang;Peng Shi

  • Affiliations:

  • The Department of Electronics and Telecommunications Engineering, King Mongkut's University of Technology, Thonburi, 91 Suksawads 48 Rd., Bangkok 10140, Thailand;The Department of Electrical and Computer Engineering, The University of Auckland, Private Bag 92019 Auckland, New Zealand;The Division of Mathematics and Statistics, School of Technology, University of Glamorgan, Pontypridd, Wales CF37 1DL, UK

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2004

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Abstract

This paper examines the problem of designing a robust H"~ output feedback controller for a class of singularly perturbed systems described by a Takagi-Sugeno fuzzy model. Based on a linear matrix inequality (LMI) approach, LMI-based sufficient conditions for the uncertain singularly perturbed nonlinear systems to have an H"~ performance are derived. To eliminate the ill-conditioning caused by the interaction of slow and fast dynamic modes, solutions to the problem are presented in terms of LMIs which are independent of the singular perturbation @?. The proposed approach does not involve the separation of states into slow and fast ones and it can be applied not only to standard, but also to nonstandard singularly perturbed nonlinear systems. A numerical example is provided to illustrate the design developed in this paper.