Robust feedforward tracking servo system for optical disk recording system

Ohishi, Kiyoshi; Kudo, Kenji; Hayakawa, Yasuhiro; Yanagisawa, Hitoshi; Koide, Daiichi; Tokumaru, Haruki

doi:10.1109/iecon.2001.975545

Cited by 26 publications

(12 citation statements)

References 6 publications

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“…In optical disk recording systems, the beam spot position cannot be measured, the disks are removable, and eccentricity is different for every track; thus, 2-DOF control similar to that of HDDs cannot be implemented. In this context, the authors have already proposed a method of predicting the target position of optical disks by using the tracking error, and have implemented a robust feedforward-based control system at a disk rotation speed of 1000 rpm [8][9][10]. However, the tracking error is extremely small compared to the target position, and hence faster and more accurate control may be expected when using direct feedforward control with respect to tracking error.…”

Section: Introductionmentioning

confidence: 96%

Robust feedforward control system considering sudden disturbance for optical disk recording system

Ohishi

Miyazaki

Inomata

et al. 2006

Electrical Engineering Japan

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SUMMARYThis paper proposes a new robust feedforward tracking servo system for optical disk recording systems in the case of a sudden disturbance for the optical disk recording system. In optical recording systems, the tracking servo system must suppress tracking error below its tolerance. This paper designs the robust feedback control system by using the coprime factorization and disturbance observer. The proposed robust feedback control system suppresses the sudden disturbance caused by walking and running. The detecting signal of optical disk recording systems is only a tracking error. Hence, the feedforward controller of the proposed tracking control system is constructed based on both Zero Phase Error Tracking (ZPET) control theory and prediction of tracking error. The experimental results point out that the proposed tracking servo system has a quick and precise tracking response and keeps the residual tracking error below its tolerance.

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Section: Introductionmentioning

confidence: 96%

Robust feedforward control system considering sudden disturbance for optical disk recording system

Ohishi

Miyazaki

Inomata

et al. 2006

Electrical Engineering Japan

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“…Generally, the tracking controller of the beam spot is the digital feedback controller with high-speed sampling [2] [3][4] [5]. Because the next generation optical disk system will become the narrower track pitch and the more high rotation speed, the cut-off frequency of the tracking control system should be the over 2kHz.…”

Section: Introductionmentioning

confidence: 99%

Single rate fine perfect tracking controller for high speed optical disk system

Miyazaki

Ohishi

Yoshida

et al. 2008

2008 34th Annual Conference of IEEE Industrial Electronics

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The tracking control system of next-generation optical disk system requires a high precision and robustness against periodic disturbance and sudden disturbance. The nextgeneration optical disk system will have the high rotational speed such as more than 10000[rpm]. Therefore, it is difficult for only conventional feedback control system to realize the high-precision and robust tracking control system. This paper proposes a single rate fine perfect tracking controller which is a new high performance tracking control system based on perfect tracking controller using only plant system model. Usually, perfect tracking controller is the multi rate controller. However, tracking control system of optical system has a rich input information, because the tracking error signal is analog signal. Therefore, this paper proposes a perfect tracking controller who operates by a single rate. The numerical simulation results point out that the proposed system realizes the high precision tracking control on condition of the disk rotation speed 8000[rpm], which is equal to CD system of 40 X speed.

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“…Because in ODDs only the TE signal is available, a modified estimation method achieves improved performance [150], and multi-loop DOBs provide further improvement [151]. Robust DOBs that take the model uncertainty into account have also been used [152], [153].…”

Section: ) Focus Servomentioning

confidence: 99%

Control Methods in Data-Storage Systems

Cherubini

Chung

Messner

et al. 2012

IEEE Trans. Contr. Syst. Technol.

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Abstract-The recording performance of data-storage devices, in which write/read elements move relative to a storage medium to reliably store and retrieve information, depends on the capability of servo mechanisms to provide the necessary positioning accuracy. The desired characteristics of servo mechanisms for datastorage systems include robustness against variations of environmental parameters, high resolution, accuracy, stability, and fast response. This paper presents a comprehensive overview of advanced servo-control methods for data storage. The applications are to well-established recording technologies, including magnetic tape and magnetic disk systems as well as CD/DVD/Blue-Ray optical data-storage systems. Moreover, newer holographic and nearfield optical systems and the emerging probe-storage technology are also addressed. Emphasis is given to the potential exhibited by the technologies considered for achieving ultra-high storage capacity, as required by the exploding demand in data-storage capacity for archival systems and massive multimedia data storage.Index Terms-Control systems, hard-disk drive, holographic data storage, optical-disk drive, scanning-probe data storage, servomechanism, tape drive.

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Robust feedforward tracking servo system for optical disk recording system

Cited by 26 publications

References 6 publications

Robust feedforward control system considering sudden disturbance for optical disk recording system

Robust feedforward control system considering sudden disturbance for optical disk recording system

Single rate fine perfect tracking controller for high speed optical disk system

Control Methods in Data-Storage Systems

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