High Frequency Radial Mode Vibration in Hard Disk Drive

Author

Ku, Chiao-Ping Roger ; Juang, Jia-Yang ; Sun, Xiaotian ; Huang, Lidu ; Huang, Fu-Ying

Author_Institution

Hitachi Global Storage Technol., San Jose, CA, USA

Volume

47

Issue

7

fYear

2011

fDate

7/1/2011 12:00:00 AM

Firstpage

1893

Lastpage

1898

Abstract

In this paper, a 3.5-in computer hard disk drive consisting of a rotating-shaft fluid dynamic bearing spindle motor and 4-disk spinning at 15 000 rpm under external linear vibration is analyzed by commercial finite element analysis software. Predicted frequency response functions of the head-disk off-track motion per unit input acceleration are compared to measured hard disk drive position-error signals on a shaker table. Both theoretical and experimental results show a huge disk pack radial motion near 1600 Hz under linear in-plane vibration. The mode shape analysis indicates that the large radial motion without noticeable disk bending is mainly due to the bending of the motor bracket and shaft. The characteristics of the high frequency radial mode are discussed with the variation of fluid dynamic bearing parameters with the verification of experimental results.

Keywords

disc drives; finite element analysis; frequency response; hard discs; machine bearings; vibrations; computer hard disk drive; disk bending; disk pack radial motion; finite element analysis software; frequency response function; head-disk off-track motion; high frequency radial mode vibration; linear in-plane vibration; mode shape analysis; rotating-shaft fluid dynamic bearing spindle motor; Damping; Finite element methods; Hard disks; Lubricants; Shape; Vibration measurement; Vibrations; Fluid dynamic bearings; frequency response function; hard disk drives; spindle motors; vibration;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2131637

Filename

5928999