A nonlinear dynamic filter to improve disturbance rejection in optical storage drives

Heertjes, Marcel; Sperling, F.B.

doi:10.1109/cdc.2003.1271674

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…However, boosting the low-frequency gain of the controller may weaken the phase-lead property around the cutoff frequency, and thus degrade the dampening property. To avoid this difficulty in designing a nominal track servo, several approaches have been proposed based on the disturbance observers (Kim [2002(Kim [ , 2003, Kim and Hong [2002], Shim et al [2003Shim et al [ , 2004), the repetitive control (Doh et al [2006], Steinbuch et al [2007], Doh et al [2002], Dong et al [2003]) or a nonlinear control (Heertjes and Sperling [2003]).…”

Section: Track Servomentioning

confidence: 99%

“…Thus, the conventional trade-off between disturbance rejection and measurement noise sensitivity is needed. In Heertjes and Sperling [2003], disturbance rejection is improved by using a nonlinear dynamic filter, which is an additional gain to the feedback controller, and the small gain theorem is used to guarantee absolute stability. Performance is also quantified using a measure derived from the linear sensitivity functions (Heertjes and Steinbuch [2004]).…”

Section: Fault Detection and Shock Disturbancementioning

confidence: 99%

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A Survey of Control Issues in Optical Data Storage Systems

Kim

Lee

Chung

2011

IFAC Proceedings Volumes

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Section: Track Servomentioning

confidence: 99%

Section: Fault Detection and Shock Disturbancementioning

confidence: 99%

A Survey of Control Issues in Optical Data Storage Systems

Kim

Lee

Chung

2011

IFAC Proceedings Volumes

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“…The surface faults impose an upper limit on the controller bandwidth, which is in conflict with the minimization of the disturbances channels, since those controllers have a high bandwidth. (Heertjes and Sperling, 2003) and (Heertjes and Steinbuch, 2004) indirectly handle the surface faults by the use of non-linear filters to improve controller sensibility without making the controllers more sensitive towards the surface faults.…”

Section: Introductionmentioning

confidence: 99%

Feature-based handling of surface faults in compact disc players

Odgaard

Stoustrup

Andersen

et al. 2006

Control Engineering Practice

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Compact Disc players have been on the market in more than two decades, and a majority of the involved control problems have been solved. However, there are still problems with playing Compact Discs related to surface faults like scratches and fingerprints. Two servo control loops are used to keep the Optical Pickup Unit focused and radially on the information track of the Compact Disc. The problem is to design servo controllers which are well suited for handling surface faults which disturbs the position measurement and still react sufficiently against normal disturbances like mechanical shocks. In this paper a novel method called feature based control is presented. The method is based on a fault tolerant control scheme, which uses extracted features of the surface faults to remove those from the detector signals used for control during the occurrence of surface faults. The extracted features are Karhunen-Loève approximations of the surface faults. The performance of the feature based control scheme controlling Compact Disc Players playing Compact Discs with surface faults have been validated by experimental work with positive conclusive results.

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“…The use of estimators to obtain accurate TE information when the optical pickup passes surface defects has been considered in [135], [169], and [170]. A nonlinear dynamic filter providing an additional gain to the feedback controller can be used to improve disturbance rejection [145], [171]. An experimental performance analysis based on frequency-domain measurements has also been made [172].…”

Section: ) Focus Servomentioning

confidence: 99%

“…Boosting the low-frequency gain of the controller may weaken the phase-lead property around the cutoff frequency and thus degrade the dampening property. To avoid this difficulty in designing a nominal track servo, various approaches have been proposed based on disturbance observers [136], [138]- [141], repetitive control [121], [142]- [144], or nonlinear control [145].…”

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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A nonlinear dynamic filter to improve disturbance rejection in optical storage drives

Cited by 6 publications

References 2 publications

A Survey of Control Issues in Optical Data Storage Systems

A Survey of Control Issues in Optical Data Storage Systems

Feature-based handling of surface faults in compact disc players

Control Methods in Data-Storage Systems

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