Robust H_∞ control with multiple constraints forthe track-following system of an optical disk drive
Moon-Noh Lee; Jung-Ho Moon; Kyoung Bog Jin; Myung Jin Chung
Industrial Electronics, IEEE Transactions on
Volume 45, Issue 4, Aug 1998 Page(s):638 - 645
Digital Object Identifier   10.1109/41.704893
Summary:In this paper, the authors design a tracking controller which satisfies transient response specifications and maintains tracking error within a tolerable limit for the uncertain track-following system of an optical disk drive. To this end, a robust H_∞ control problem, with regional stability constraints and sinusoidal disturbance rejection is considered. The internal model principle is used for rejecting the sinusoidal disturbance caused by eccentric rotation of the disk. The authors show that a condition satisfying the regional stability constraints can be expressed in terms of a linear matrix inequality (LMI) using the Lyapunov theory and S-procedure. Finally, a tracking controller is obtained by solving an LMI optimization problem involving two LMIs. The proposed controller design method is evaluated through an experiment

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