Robust Following Control of Optical Disk Recording System Based on ZPET Control and Sudden Disturbance Observer
| Authors: | Ohishi Kiyoshi, Nagaoka University of Technology, Japan
Hayano Toru, Nagaoka University of Technology, Japan
Miyazaki Toshimasa, Nagaoka National College of Technology, Japan
Koide Daiichi, NHK Science and Technical Research Laboratories, Japan
Tokumaru Haruki, NHK Science and Technical Research Laboratories, Japan |
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| Topic: | 4.2 Mechatronic Systems |
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| Session: | Mechatronic Applications |
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| Keywords: | Optical disks, Tracking systems, Robust control, Coprime factorization, Feedforward control, Disturbance rejection |
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Abstract
In optical recording system, the tracking servo system must follow the track of optical disk against the influence of the track eccentricity and the force disturbance. In tracking servo system, the influence of the track eccentricity becomes periodic disturbance. The influence of force disturbance is sudden disturbance. This paper proposes a new robust tracking servo system for optical disk recording system with feedforward controller and sudden disturbance observer. In order to suppress the periodic disturbance, this paper designs the feedforward control system with prediction of tracking error. For suppressing the sudden disturbance, this paper proposes the sudden disturbance observer by using the predictive tracking error. The experimental results point out that the proposed tracking servo system has a precise tracking response against both periodic disturbance and sudden disturbance.
