Stable H-infinity controller design for time-delay systems

This paper investigates stable suboptimal H-infinity controllers for a class of single-input single-output time-delay systems. For a given plant and weighting functions, the optimal controller minimizing the mixed sensitivity (and the central suboptimal controller) may be unstable with finitely or infinitely many poles in complex right half-plane. For each of these cases search algorithms are proposed to find stable suboptimal H-infinity controllers. These design methods are illustrated with examples.

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