Vibrations in Contact Magnetic Recording System: Basic Features, Analytical Solution and Novel Numerical Method

Sheng, Gang; Liu, B.; Zhu, Yao-Long

doi:10.1142/9789812815903_0018

Cited by 3 publications

(1 citation statement)

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“…Sinclari [47] to estimate how hard did a head hit a di sk. Sheng, et al [48] proposed a theoretical model of one-degree-of-freedom-system for the head-di sk contact vibrati on stud y, and gave out a bilinear model of the system restoring force.…”

Section: Dynamics Of Head Disk Interfacementioning

confidence: 99%

Drop and impact dynamics analysis of hard disk drive (HDD) systems

Gu¹

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Nowadays, hard disk drives (HDDs) are widely used in portable consumer appliances and gadgets. These HODs are more susceptibl e to shock and vibration during using. Their shock performance under operation and non-operati on is becoming an increas ingly important iss ue. One important damage mode of the HOD is the " head slap" behaviour, which is triggered by a shock load th at exceeds th e suspension preload, causing the head to fl y off from the disk and then slap on the di sk. Thus, the particles generated on the disk med ium may cause contamination problem. The head slap should be stri ctl y avo ided. One approach for dea ling with the shock problems is to des ign a robust mechanica l system and slider/di sk interface. It is very clear that the trend of the HOD development is higher areal density and higher speed. The size of the HOD and its components become smaller and smaller. The improved perform ance of the mechanical parts has been of great sign ificance in thi s progress. A better understandin g of dynamic characteristi cs of the mechanica l parts is essenti al. To investigate the drop and impact dynamic characteristics of hard di sk dri ves, both experiments and numeri ca l simulations are conducted here. First ly, the boundary cond ition of disk of an HOD was in vestigated by finite element ana lysis and experimental tests. Modal analys is is conducted with simplifi ed FE model and the results are compared with experimental results. The rea l boundary cond ition of disk is simu lated with FE model considering the contact between clamp and disk and the contact between disk and hub. Based on the contact model , des ign

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Section: Dynamics Of Head Disk Interfacementioning

confidence: 99%

Drop and impact dynamics analysis of hard disk drive (HDD) systems

Gu¹

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Nonlinear dynamics of sub-10nm flying height air bearing slider in modern hard disk recording system

Sheng

Dukkipati

Pang

2006

Mechanism and Machine Theory

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Three-Dimensional Motion of Sliders Contacting Media

Kiely

Hsia

2006

Journal of Tribology

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Characterization of slider motion induced by contact is becoming a critical aspect of developing advanced head-disk interfaces. While vertical motion induced by contact has been studied, very little is known about off- and down-track motions. We have applied three separate laser Doppler vibrometers to measure slider movement in three orthogonal directions simultaneously. We have measured the position of a slider as it undergoes a transition from flying to making full contact with the media surface. We find that slider motion varies considerably with varying levels of contact and that motion in all three directions is considerable. Spectral decomposition is used to identify the vibration modes that are excited in each direction, and we find that for most of the test velocities, modes excited in the vertical direction give rise to motion in the two orthogonal directions. In addition, we present a depiction of the vertical, down-track, and off-track position changes by plotting the position of the slider in real space coordinates to help visualize more completely how the slider moves in space. These trajectories depict the periodic, elliptical path the slider takes and identify how the paths change with contact. Analysis of motion identifies that at some levels of contact, a majority of motion is repeatable, but that nonrepeatable components increase with the amount of contact. Additionally, down-track motion is the only component whose magnitude increases monotonically with increasing contact.

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Vibrations in Contact Magnetic Recording System: Basic Features, Analytical Solution and Novel Numerical Method

Cited by 3 publications

References 0 publications

Drop and impact dynamics analysis of hard disk drive (HDD) systems

Drop and impact dynamics analysis of hard disk drive (HDD) systems

Nonlinear dynamics of sub-10nm flying height air bearing slider in modern hard disk recording system

Three-Dimensional Motion of Sliders Contacting Media

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