Characterization and Compensation of Disturbances Caused by Head-Disk Contact in Hard Disk Drives

White, Matthew

doi:10.1109/acc.2007.4282564

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…In [12], the effect of disk roughness on CIV is addressed. In [13] and [14], the characteristics of CIV have been investigated when the contact between the head and disk is light or partial.…”

Section: Introductionmentioning

confidence: 99%

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Contact-Induced Vibration in Dual-Stage Hard Disk Drive Servo Systems and Its Compensator Design

Huang

Venkataramanan

2014

IEEE Trans. Ind. Electron.

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This paper presents the experimental observation results of contact-induced vibration (CIV) and its compensator design in dual-stage hard disk drive servo systems, where the vibration is caused by the continuous contact of read/write head and recording media. Consistent relationships between the center frequencies and magnitudes of the vibration modes and the tested fly height, rotation speed, and track position are clearly observed and analyzed. It reveals that the CIVs excite and amplify only the resonance modes of the system. In consequence, the so-called P Q method is adopted to perform the compensator design. As such, the relative contributions to system output from the voice coil motor and lead-zirconium-titanate actuator subsystems can be well assigned in the frequency domain. The remarkable performance of the well-designed compensator is demonstrated by simulation.Index Terms-Contact-induced vibration (CIV), fly height, hard disk drive (HDD), rotational speed, servo systems, track position, vibration control, vibration measurement.

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Section: Introductionmentioning

confidence: 99%

“…In particular, a repetitive controller is applied to suppress the main repeatable runout (RRO) part of CIV in [13]. Recently, effort has been made in [3] and [15]- [18] to further exploit the characteristics of CIV and servo controller design for the heavy-contact case, where the single-stage HDD servo structure is used.…”

Section: Introductionmentioning

confidence: 99%

Contact-Induced Vibration in Dual-Stage Hard Disk Drive Servo Systems and Its Compensator Design

Huang

Venkataramanan

2014

IEEE Trans. Ind. Electron.

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“…Three main obstacles are: (i) CIV modeling; (ii) actuator bandwidth limit; and (iii) the performance requirement for a very fast or deadbeat type vibration control. Recently, and have investigated the charactereistics of CIV when the contact between head‐disk interface is light or partial. In particular, repetitive controller is applied to suppress the main repeatable runout (RRO) part of CIV in .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, and have investigated the charactereistics of CIV when the contact between head‐disk interface is light or partial. In particular, repetitive controller is applied to suppress the main repeatable runout (RRO) part of CIV in . Our previous work presents the investigation and modeling result of CIV for the heavy contact case, where the CIV peaks are located in medium frequency range.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Compensation of Contact‐Induced Vibration in High Density HDD Servo Systems Using Phase Lead Peak Filter Method

Xu¹,

Huang²,

Venkataramanan³

2013

Asian Journal of Control

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In this paper, a phase lead peak filter (PLPF) design method is adopted to adaptively compensate for high frequency contact‐induced vibration (CIV) in hard disk drive (HDD) servo systems. Based on the prior investigation of CIV, a baseline feedback controller is first employed to stabilize the servo loop, and then add‐on peak filters are connected in parallel with the baseline controller to further suppress the vibrations in the high frequency range. The proposed CIV compensation scheme has a simple control structure, is capable of dealing with multiple vibration modes that may not be within the bandwidth of open‐loop transfer function, and is robust to the change of CIV in frequency and magnitude. The performance of the proposed method in CIV compensation is validated by simulation and experiment.

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“…In such extremely small spacing, contacts between disks and sliders are inevitable and may occur more frequently or even constantly such as in the contact recording (9) . The interference between the disk and the slider which carries the R/W head will lead to off-track motion of the R/W head as well as suspension vibration by exciting the structural resonance modes (10), (11) .…”

Section: Introductionmentioning

confidence: 99%

Stable Peak Filtering Method to Reject High Frequency Disturbance in Hard Disk Drives

Fan

2010

JAMDSM

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In this paper, novel solutions are provided for designing the disturbance filter when there are significant plant dynamics within the bandwidth of the filter. The filter zero is designed appropriately so that the root loci originating from both the filter poles and the lightly damped plant poles go to the stable region under certain low gain condition. By providing compromised departure angles from filter poles and plant poles, the stability margin especially the gain margin is dramatically increased. The resulting closed-loop systems can provide large gain attenuation at the resonance frequency, and thus have more disturbance rejection capability.

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Characterization and Compensation of Disturbances Caused by Head-Disk Contact in Hard Disk Drives

Cited by 3 publications

References 6 publications

Contact-Induced Vibration in Dual-Stage Hard Disk Drive Servo Systems and Its Compensator Design

Contact-Induced Vibration in Dual-Stage Hard Disk Drive Servo Systems and Its Compensator Design

Adaptive Compensation of Contact‐Induced Vibration in High Density HDD Servo Systems Using Phase Lead Peak Filter Method

Stable Peak Filtering Method to Reject High Frequency Disturbance in Hard Disk Drives

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