Tracking Control System with Equivalent Perfect Tracking Control for Optical Disks

Ogata, Tokoku; Sakimura, Naohide; Nakazaki, Tatsuya; Ohishi, Kiyoshi; Miyazaki, Toshimasa; Koide, Daiichi; Tokumaru, Haruki; Takano, Yoshimichi

doi:10.1541/ieejias.132.1121

Cited by 4 publications

(5 citation statements)

References 23 publications

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“…We have already proposed an error prediction tracking control system with an equivalentperfect tracking control (E-PTC) system. [9][10][11] The experimental results of the E-PTC system indicated adequate suppression of the tracking error. However, it is difficult to design the control parameter for actual multi-harmonic disturbances.…”

Section: Introductionmentioning

confidence: 90%

“…Equation (9) shows the conventional eccentric disturbance model that has been used. The results of a simulation using…”

Section: Conventional Simple Model Simulationmentioning

confidence: 99%

“…Using the pseudoinverse matrix, we have already proposed that it is possible to compose the E-PTC system. [9][10][11] The E-PTC system enables the entire system to be composed of a single sampling frequency. The inverse system of the E-PTC system can be represented in its pre-multi-rate state, as shown in Eqs.…”

Section: Perfect Tracking Controlmentioning

confidence: 99%

See 2 more Smart Citations

Double Feedforward Control System Based on Precise Disturbance Modeling for Optical Disk

Sakimura

Nakazaki

Ohishi

et al. 2013

Jpn. J. Appl. Phys.

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Optical disk drive systems must realize high-precision tracking control for their proper operation. For this purpose, we previously proposed a tracking control system that is composed of a high-gain servo controller (HGSC) and a feedforward controller with an equivalent-perfect tracking control (E-PTC) system. However, it is difficult to design the control parameter for actual multi-harmonic disturbances. In this paper, we propose a precise disturbance model of an actual optical disk using the experimental spectrum data of a feedback controller and describe the design of a fine tracking control system. In addition, we propose a double feedforward control (DFFC) system for further high-precision control. The proposed DFFC system is constructed using two zero phase error tracking (ZPET) control systems based on error prediction and trajectory command prediction. Our experimental results confirm that the proposed system effectively suppresses the tracking error at 6000 rpm, which is the disk rotation speed of Digital Versatile Disk Recordable (DVD+R).

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Section: Introductionmentioning

confidence: 90%

“…Equation (9) shows the conventional eccentric disturbance model that has been used. The results of a simulation using…”

Section: Conventional Simple Model Simulationmentioning

confidence: 99%

See 1 more Smart Citation

Double Feedforward Control System Based on Precise Disturbance Modeling for Optical Disk

Sakimura

Nakazaki

Ohishi

et al. 2013

Jpn. J. Appl. Phys.

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“…The conventional PTC system realizes a high-precision system; however, the whole system is complicated, and the processing time is long. This problem is solved by using an equivalent-perfect tracking control (E-PTC) as the de-sign method for the feedforward control system, and the good performance of this approach was confirmed experimentally (12) (13) .…”

Section: Introductionmentioning

confidence: 95%

Fine Tracking Control System based on Double Equivalent-Perfect Tracking Control System and Error-Based Disturbance Observer for Optical Disk

et al. 2015

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Recently, high-precision tracking control has been required for optical disks. For this purpose, we have previously proposed a tracking control system that is composed of an equivalent-perfect tracking control (E-PTC). However, the conventional control system is not able to operate the inverse system properly for the state equation. In this paper, we propose a new double E-PTC system. With this new system, the inverse system for the state equation operates properly. In addition, we propose a double E-PTC system with an error-based disturbance observer using a notch filter for non-periodic disturbance suppression. The proposed system achieves more precise control and experimental results demonstrate its effectiveness.

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“…Moreover, designing a feedforward controller is difficult because the general optical disk systems do not obtain a reference signal (3)- (5) . In order to overcome these problems, we previously has proposed several focusing and tracking control systems, such as a robust feedforward tracking controller based on zero phase error tracking (ZPET) control and prediction of tracking error (6) (7) , a ZPET controller with a multi-harmonic disturbance suppression loop (8) and equivalent-perfect tracking control (E-PTC) (9) .…”

Section: Introductionmentioning

confidence: 99%

Short Trajectory Control between Focusing and Tracking Based on Two-Dimensional Equivalent-Perfect Tracking Control for Optical Disk

et al. 2015

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A pickup system for optical disks operates in the horizontal and vertical directions for tracking and focusing, respectively. The conventional optical disk system is designed for each direction of operation. The conventional system becomes slow in moving to the next point because it does not consider the operation trajectory. Thus, because the point-to-point movement becomes longer, there is possibility that the tracking performance is deteriorated in highspeed rotation. In order to achieve faster operation, we develop a concurrent control method of tracking and focusing on an optical disk and realize short trajectory control. In this paper, a new two-dimensional feedforward control system is proposed, which has concurrent control of focusing and tracking. The feedforward controller is based on equivalentperfect tracking control (E-PTC). The experimental results show the effectiveness of the proposed control system.

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Tracking Control System with Equivalent Perfect Tracking Control for Optical Disks

Cited by 4 publications

References 23 publications

Double Feedforward Control System Based on Precise Disturbance Modeling for Optical Disk

Double Feedforward Control System Based on Precise Disturbance Modeling for Optical Disk

Fine Tracking Control System based on Double Equivalent-Perfect Tracking Control System and Error-Based Disturbance Observer for Optical Disk

Short Trajectory Control between Focusing and Tracking Based on Two-Dimensional Equivalent-Perfect Tracking Control for Optical Disk

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