Characterization of lateral tape motion and disturbances in the servo position error signal of a linear tape drive

Jose, Jan; Taylor, Ryan J.; Callafon, Raymond A. de; Talke, Frank E.

doi:10.1016/j.triboint.2005.01.011

Cited by 10 publications

(4 citation statements)

References 7 publications

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“…The disturbance rejection transfer function can be approximated as a high-pass filtering function with a cutoff frequency that roughly corresponds to the control bandwidth. In [62], system identification methods are used to estimate a high-order filter that accurately models the dynamics of the disturbance rejection transfer function and the spectral content of additional disturbances that contribute to the PES, besides the LTM. Using the estimated model in conjunction with LTM measurements obtained by optical sensors, the PES can be accurately predicted and the impact of additional disturbances, e.g., servo pattern written-in errors occurring during tape manufacturing, can be evaluated independently of LTM.…”

Section: Track Followingmentioning

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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Section: Track Followingmentioning

confidence: 99%

Control Methods in Data-Storage Systems

Cherubini

Chung

Messner

et al. 2012

IEEE Trans. Contr. Syst. Technol.

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“…Therefore, greater length of media vibrates; which causes the spring and damping parameters to be time varying. Moreover, other sources of uncertainty are caused by the supply and take-up motor dynamics, mechanical vibrations of travelling tape and interfacing dynamics between travelling tape and read/write actuator (Jose et al 2005).…”

Section: Tracking System Simulation Based On Integral Controlmentioning

confidence: 99%

Robust regulation and tracking system design for multivariable control of the tape transport mechanism

2012

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Tape mechanisms must be able to transport the tape with a constant velocity for achieving high rate of data transfer. In this paper, a multivariable model of tape transport mechanism including the take-up and supply reel servos for tape tension control and capstan servo for speed control is considered. To achieve desired performance, pole-placement approach based on general canonical control form (GCCF) is used. Instead of using expensive tension sensors, an observer is designed. A regulator system is developed for disturbance rejection; and a modified integral control is designed for perfect tracking of desired setpoints in tape speed and tensions. Since the real dynamic model associates with parametric uncertainties, an algorithm is developed for robust pole-placement. Eigenvalues of the uncertain control system are chosen such that appropriate responses are achieved while control efforts remain small bounded. Results show that robust performance is obtained for uncertain models with various parametric uncertainties.

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“…Dynamics of lateral web motion has been analyzed by Shelton 48 and Benson, 2 among many others. More recently, Taylor et al 21,51 and Machida and Wickert. 27 investigated the lateral tape motion for linear tape drives.…”

Section: Introductionmentioning

confidence: 97%

W3 Mechanics of Thin, Flexible, Translating Media and Their Interactions with Surrounding Air

Müftü

2005

IIP

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Thin, flexible, continuous structures known as webs are used in a wide range of industrial applications. These structures interact with the surrounding air in beneficial or detrimental ways, depending on the application and the process parameters. A review of the literature related to modeling and experimental work on (mostly) the steady state fluid-structure interactions is given. Equilibrium equations of web mechanics, and the inertia dominated and viscosity dominated air flows are presented. Simulation examples from four different industrial applications; web/air-bar interactions; roller/web interactions for permeable and impermeable webs; and the flat-top recording-head/magnetic-tape interactions, are presented.

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Characterization of lateral tape motion and disturbances in the servo position error signal of a linear tape drive

Cited by 10 publications

References 7 publications

Control Methods in Data-Storage Systems

Control Methods in Data-Storage Systems

Robust regulation and tracking system design for multivariable control of the tape transport mechanism

W3 Mechanics of Thin, Flexible, Translating Media and Their Interactions with Surrounding Air

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