Seek Control to Suppress Vibrations of Hard Disk Drives Using Adaptive Filtering

Semba, T.; White, Matthew

doi:10.1109/tmech.2008.2001036

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…However, the dynamics of disk drives, although complex, are largely linear, and thus disk drives are candidates for control-design methodologies for linear systems. The track seek must balance the need for rapid movement with the need for low noise in consumer applications, e.g., desktop computers [77], low power consumption in mobile applications, e.g., laptops [78], and low emitted vibration due to reaction forces and moments in applications with multiple drives in a single rack, e.g., server systems [79]. The seek control must also account for saturation of the amplifier and prominent hysteresis nonlinearities in the friction of the pivot bearing [80].…”

Section: B Servo System Functions and Challengesmentioning

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: B Servo System Functions and Challengesmentioning

confidence: 99%

Control Methods in Data-Storage Systems

Cherubini

Chung

Messner

et al. 2012

IEEE Trans. Contr. Syst. Technol.

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“…Glugla et al [13] proposed a delay compensation LMS vibration control algorithm of the FIR filter structure by modifying the gradient operator. Semba et al [14] carried out simulations and experimental verification of the hard drive FIR filtering adaptive vibration control and contrasted switch control results. Tammi [15] compared the LMS algorithm of the FIR filter with the adaptive control method of frequency convergence, and pointed out that the adaptive control method of frequency convergence was simpler and had a better control effect.…”

Section: Introductionmentioning

confidence: 99%

Analysis and implementation of a structural vibration control algorithm based on an IIR adaptive filter

Huang

Luo

et al. 2013

Smart Mater. Struct.

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With the wide application of large-scale flexible structures in spacecraft, vibration control problems in these structures have become important design issues. The filtered-X least mean square (FXLMS) algorithm is the most popular one in current active vibration control using adaptive filtering. It assumes that the source of interference can be measured and the interference source is considered as the reference signal input to the controller. However, in the actual control system, this assumption is not accurate, because it does not consider the impact of the reference signal on the output feedback signal. In this paper, an adaptive vibration active control algorithm based on an infinite impulse response (IIR) filter structure (FULMS, filtered-U least mean square) is proposed. The algorithm is based on an FXLMS algorithm framework, which replaces the finite impulse response (FIR) filter with an IIR filter. This paper focuses on the structural design of the controller, the process of the FULMS filtering control method, the design of the experimental model object, and the experimental platform construction for the entire control system. The comparison of the FXLMS algorithm with FULMS is theoretically analyzed and experimentally validated. The results show that the FULMS algorithm converges faster and controls better. The design of the FULMS controller is feasible and effective and has greater value in practical applications of aerospace engineering.

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Frequency-shaping optimal compensation of low fly-height vibration in high density HDD servo systems

Huang

Venkataramanan

et al. 2011

2011 9th IEEE International Conference on Control and Automation (ICCA)

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In this work, a novel robust observer-based frequency-shaping optimal feedback (OBFSOF) controller is designed to actively compensate low fly height vibration (LFHV) in hard disk drive (HDD) servo systems. LFHV is a new vibration source due to continuous contact of the read/write head with the media in high density HDDs. The main characteristics of LFHV are the time-varying phase and magnitude, and the wideband frequency spectrum. Differing from many existing non-repeatable runout (NRRO) compensation schemes that focus on a finite number of dominant frequency components, the proposed OBFSOF scheme can suppress infinitely many frequency components concurrently, meanwhile keep robust stability to model uncertainties and disturbances. The effectiveness of the proposed OBFSOF scheme is verified by theoretical analysis and numerical simulations on a real HDD model. By replacing the linear part of PTOS controller with the proposed OBFSOF controller, the maximal LFHV magnitude is decreased by 62.8% comparing with the PTOS controller during the track following stage.

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Seek Control to Suppress Vibrations of Hard Disk Drives Using Adaptive Filtering

Cited by 10 publications

References 25 publications

Control Methods in Data-Storage Systems

Control Methods in Data-Storage Systems

Analysis and implementation of a structural vibration control algorithm based on an IIR adaptive filter

Frequency-shaping optimal compensation of low fly-height vibration in high density HDD servo systems

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