TY - JOUR T1 - A Non-PDC H∞ Output Feedback Controller Design for T-S Fuzzy Systems with Unknown Premise Variables and Control Constraints via LMI TT - طراحی یک کنترلگر بازخورد خروجی ∞H غیر PDC برای سیستمهای فازی T-S با متغیرهای مقدم قواعد نامعلوم و دارای محدودیت کنترلی بر پایه LMI JF - joc-isice JO - joc-isice VL - 6 IS - 1 UR - http://joc.kntu.ac.ir/article-1-68-en.html Y1 - 2012 SP - 51 EP - 60 KW - H∞ observer-based control KW - Descriptor redundancy approach KW - T-S fuzzy system KW - fuzzy Lyapunov function KW - linear matrix inequality (LMI). N2 - In this paper, non-PDC H∞ observer-based controller design for disturbed T-S fuzzy systems with unknown premise variables is addressed for the first time. Unlike the available non-PDC-based approaches, real state variables are not used in the controller equation. Moreover, using the descriptor redundancy approach, the observer and controller gains are calculated by solving some strict linear matrix inequalities (LMIs). A fuzzy Lyapunov function approach is utilized to obtain less conservative design conditions than previous methods. Furthermore, in order to satisfy an arbitrary upper bound on the absolute value of the control signal, additional design conditions are obtained which depend on the upper bounds of the initial states of the observer. The effectiveness of the proposed method is shown via a numerical simulation. M3 ER -