Browsing by Subject "H-infinity control"

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    Implementation of stabilizing controllers for retarded delay systems
    (Elsevier Ltd., 2024-11-26) Bonnet, C; Özbay, Hitay; Yeğin, Mustafa Oğuz; Gümüşsoy, S.
    This paper proposes a way to efficiently implement stabilizing controllers for delay systems of the retarded type. We indeed choose a particular controller (central controller) in the set of all stabilizing controllers and decompose its transfer function in terms of stable delay systems and Finite Impulse Response (FIR) filters. The central controller is written in such a way that the corresponding Matlab/Simulink implementation scheme is obvious. We illustrate that all stabilizing controllers can be implemented by using stable components only around the central controller. We also discuss stability robustness in the presence of implementation errors. The method is illustrated in an example. Copyright (c) 2024 The Authors.
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    Sensitivity minimization by stable controllers for a class of unstable time-delay systems
    (IEEE, 2006) Gümüşsoy, S.; Özbay, Hitay
    In this paper sensitivity minimization problem is considered for a class of unstable time delay systems. Our goal is to find a stable controller stabilizing the feedback system and giving rise to smallest H∞ norm for the sensitivity function. This problem has been solved by Ganesh and Pearson (1986) for finite dimensional plants using Nevanlinna-Pick interpolation. We extend their technique to include possibly unstable time delay systems. Moreover, we illustrate suboptimal solutions, and their robust implementation.