Robust H/sub ∞/ control with multiple constraints for the track-following system of an optical disk drive

This paper is concerned with the seek control of Optical Disk Drives (ODDs). We propose a direct Seek Control Scheme (SCS) that provides fast data access capability and robust stability for high-performance Optical Disk Drives. Although an optical disk drive has a significant advantage of random accessibility, increased rotational speed of a disk and limitations of mechanical structure always make it impossible for the conventional SCS to achieve stable and satisfactory seek performance. The conventional seek control technique utilizes only the coarse actuator without any maneuvering of the fine actuator. In this paper, we analyze the problems that may arise when the conventional SCS is applied to high-speed rotational ODD and propose a new SCS that employs both the coarse and fine actuators. With assistance of the fine actuator, however, the seek control system is designed such that its performance is guaranteed for various disturbances and mechanical limitations. Simulations and experiments show the improvements of the proposed direct SCS implemented on a practical DVD-ROM drive system.

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A new direct Seek Control Design of Optical Disk Drives

Dong

Wang

Zhou

2005

Microsyst Technol

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Robust adaptive nonlinear control for uncertain control-affine systems and its applications

2008

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This paper addresses the robust tracking control problem for a class of uncertain nonlinear systems with time-varying parameters, perturbed by external disturbances. The unknown time-varying parameters and disturbances are neither required to be periodic nor to have known bounds. Depending on the characteristics of disturbance signals, two adaptivebased control algorithms are developed. First, an adaptive H ∞ control is designed that achieves: (i) an H ∞ tracking performance when the external disturbances are L 2 signals, and (ii) the convergence of tracking error to zero if the disturbances are bounded and L 2 signals. Then a novel adaptive control algorithm is proposed, only with the assumption of boundedness of disturbances, to drive the tracking error to zero. The designed tracking controllers are then used for controlling a cart-pendulum system, as an underactuated mechanical system, and chaos synchronization of uncertain Genesio-Tesi chaotic system. Numerical simulations are also given to demonstrate the effectiveness of the proposed control schemes.

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Robust disturbance observer for the track-following control system of an optical disk drive

Ryoo

Doh

Chung

2004

Control Engineering Practice

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Robust H/sub ∞/ control with multiple constraints for the track-following system of an optical disk drive

Cited by 34 publications

References 18 publications

A new direct Seek Control Design of Optical Disk Drives

A new direct Seek Control Design of Optical Disk Drives

Robust adaptive nonlinear control for uncertain control-affine systems and its applications

Robust disturbance observer for the track-following control system of an optical disk drive

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