Robust H control for uncertain nonlinear active magnetic bearing systems via takagi-sugeno fuzzy models

Dong Hwan Lee, Jin Bae Park, Young Hoon Joo, Kuo Chi Lin, Chan Ho Ham

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


In this paper, a systematic procedure to design the robust H , fuzzy controller for a nonlinear active magnetic bearing (AMB) system affected by time-varying parametric uncertainties is presented. First, the continuous-time Takagi-Sugeno (T-S) fuzzy model is employed to represent the nonlinear AMB system. Next, based on the obtained fuzzy model, sufficient conditions are derived in terms of linear matrix inequalities (LMIs) for robust stability and H, performance of the control system. The main feature of this paper is that some drawbacks existing in the previous approaches such as truncation errors and nonconvex bilinear matrix inequality (BMI) problem are eliminated by utilizing the homogeneous fuzzy model which includes no bias terms in the local state space models rather than the affine one which includes bias terms. Hence, the design method presented here will prove to be more tractable and accessible than the previous ones. Finally, numerical simulations demonstrate the effectiveness of the proposed approach.

Original languageEnglish
Pages (from-to)636-646
Number of pages11
JournalInternational Journal of Control, Automation and Systems
Issue number3
Publication statusPublished - 2010 Jun

Bibliographical note

Funding Information:
Manuscript received December 1, 2009; revised March 5, 2010; accepted March 18, 2010. Recommended by Editorial Board member Yangmin Li under the direction of Editor Jae Weon Choi. This work was partially supported by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) (KRF-2009-220-D00034).

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Computer Science Applications


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