Numerical analysis of flying-height fluctuation and positioning error of magnetic head due to flow induced by disk rotation

Author

Tokuyama, M. ; Yamaguchi, Y. ; Miyata, S. ; Kato, C.

Author_Institution

Hitachi Ltd., Tsuchiura, Japan

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

5139

Lastpage

5141

Abstract

A numerical analysis method is proposed for the evaluation of flying-height fluctuation and positioning error necessary for designing high-recording-density and high-disk-speed disk drives. Flying-height fluctuation and positioning error of a head are calculated by applying flow force fluctuation, which is calculated using a finite-element-method program for turbulent flow around the suspension of the head to a vibration analysis program for the head and its suspension. In the flow analysis, a pseudo-three-dimensional flow model based on experimental observation is used. In this model, three kinds of vortex street cells are distributed along the span of the suspension. The calculated fluctuations of a head between two corotating 356-mm-diameter disks at 3600 rpm agree with those measured in an actual 356-mm disk drive

Keywords

finite element analysis; magnetic disc storage; magnetic heads; turbulence; vibrations; finite-element-method program; flow induced by disk rotation; flying-height fluctuation; high-disk-speed disk drives; magnetic head; positioning error; pseudo-three-dimensional flow model; turbulent flow; vibration analysis program; vortex street cells; Asia; Boundary conditions; Disk drives; Disk recording; Fluctuations; Magnetic analysis; Magnetic heads; Magnetic levitation; Numerical analysis; Rotation measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278766

Filename

278766