Robust Control of CD-ROM Drives Using Multirate Disturbance Observer.

Okuyama, Atsushi; Soma, Masayo; Yonetani, Takashi; Yanagihara, Norihisa; Mii, Yasuhiro; Yamada, Hidehito

doi:10.1299/jsmec.41.806

Cited by 8 publications

(1 citation statement)

References 6 publications

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“…Moreover, the designing of a feedforward controller is difficult because general optical disk systems do not receive a reference signal. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] To overcome these problems, we have previously proposed several focusing and tracking control systems such as a robust feedforward tracking controller based on zero phase error tracking (ZPET) feedforward control and prediction of the tracking error. [26][27][28] Generally, the focusing actuator and the tracking actuator are controlled separately.…”

Section: Introductionmentioning

confidence: 99%

Single-rate two-dimensional feedforward control system for optical disk systems in consideration of the phase delay

Ohashi¹,

Yoshida²,

Ohishi³

et al. 2015

Jpn. J. Appl. Phys.

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The size of digital content has been on the increasing in recent times, and this has been led to the need for correspondingly scaling up the capacity of digital storage media. Therefore, a high-precision focusing and tracking control system are required for an optical disk. A pickup system for optical disks operates in the horizontal and vertical directions for tracking and focusing, respectively. Thus, this paper proposes a new single-rate two-dimensional feedforward control system, which is the concurrent control of focusing and tracking. The feedforward controller is based on a zero phase error tracking (ZPET) control. Experimental results show the effectiveness of the proposed control system.

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Section: Introductionmentioning

confidence: 99%

Single-rate two-dimensional feedforward control system for optical disk systems in consideration of the phase delay

Ohashi¹,

Yoshida²,

Ohishi³

et al. 2015

Jpn. J. Appl. Phys.

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Focusing control system for suppressing multi-harmonic disturbances in high speed optical disk systems

Nakazaki

Ogata

Ohishi

et al. 2012

2012 12th IEEE International Workshop on Advanced Motion Control (AMC)

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Recently, the size of digital content has continued to increase; therefore digital storage media have been required to increase capacity by narrowing the track pitch and the gap length between the optical head and the disk. On the other hand, anew optical disk has achieved a rotation speed of over 15,000 rpm. To meet these demands, several control systems for optical disks are proposed to achieve high-precision tracking control. In this paper, a high-precision focusing control system is proposed. The proposed control system consists of a feedback controller and a feedforward controller. The feedback controller design is based on a high-gain servo controller (HGSC). The feedforward controller design is based on a zero phase error tracking (ZPET) controller and an additional loop for suppressing multi-harmonic disturbances. The experimental results show the proposed control system has a fine focusing performance against fundamental periodic disturbances and high-order disturbances.

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Minimum tracking & focusing trajectory control based on two-dimensional equivalent PTC for optical disk

Ohashi

Sakimura

Ohishi

et al. 2014

2014 IEEE 13th International Workshop on Advanced Motion Control (AMC)

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Robust Control of CD-ROM Drives Using Multirate Disturbance Observer.

Cited by 8 publications

References 6 publications

Single-rate two-dimensional feedforward control system for optical disk systems in consideration of the phase delay

Single-rate two-dimensional feedforward control system for optical disk systems in consideration of the phase delay

Focusing control system for suppressing multi-harmonic disturbances in high speed optical disk systems

Minimum tracking & focusing trajectory control based on two-dimensional equivalent PTC for optical disk

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Robust Control of CD-ROM Drives Using Multirate Disturbance Observer.

Cited by 8 publications

References 6 publications

Single-rate two-dimensional feedforward control system for optical disk systems in consideration of the phase delay

Single-rate two-dimensional feedforward control system for optical disk systems in consideration of the phase delay

Focusing control system for suppressing multi-harmonic disturbances in high speed optical disk systems

Minimum tracking &amp; focusing trajectory control based on two-dimensional equivalent PTC for optical disk

Contact Info

Product

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Minimum tracking & focusing trajectory control based on two-dimensional equivalent PTC for optical disk