© The Institution of Engineering and Technology
This study is concerned with the problem of output feedback fuzzy H∞-tracking control design for nonlinear time-delay systems. Initially, a discrete-time Takagi–Sugeno (T–S) modelling approach is applied. Then a general and extended structure for the controller is assumed. Finally, a linear matrix inequality (LMI) approach is offered to find the possible solutions. The final design will result in the closed-loop stability of the system together with minimising the H∞-tracking control norm to some reference and bounded signals. Despite the existing results which offer a set of coupled LMIs and a double step algorithm to find a possible solution, the authors' results are a single step and less conservative. Moreover, the authors let the time delay to exist both in state and input matrices of the T–S fuzzy model. Two simulation examples are given to illustrate the effectiveness of the obtained method in comparison with the existing ones.
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