Modeling and experimental analysis of the vibrations in hard disk drives

Author

Ferretti, Gianni ; Magnani, GianAntonio ; Rocco, Paolo

Author_Institution

Dipt. di Elettronica e Inf., Politecnico di Milano, Italy

Volume

7

Issue

2

fYear

2002

fDate

6/1/2002 12:00:00 AM

Firstpage

152

Lastpage

160

Abstract

A combined methodology, based on dynamic modeling and experimental measures, is used to study the vibrations in hard disk drives, in a frequency range up to 1 kHz. A lumped parameter model of the disks/spindle assembly is developed, where only the disk modes coupled with the spindle motion are retained. The proposed model has been validated by comparison with experimental results. Using the model, the sources of axial and radial vibrations measured in a single plate commercial hard disk drive have been explained. Among them are the disk structural resonances, due to compliances in bearings and disks, displacements of the center of mass from the rotation axis and unbalanced magnetic forces. On the other hand, no evidence has been found of the influence of torque disturbances on the measured vibrations

Keywords

disc drives; hard discs; vibrations; 0 to 1 kHz; axial vibrations; bearings; compliances; disk modes; dynamic modeling; hard disk drives; lumped parameter model; radial vibrations; single plate disk drive; spindle motion; structural resonances; unbalanced magnetic forces; Assembly; Disk drives; Frequency measurement; Hard disks; Magnetic forces; Resonance; Resonant frequency; Springs; Torque; Vibration measurement;

fLanguage

English

Journal_Title

Mechatronics, IEEE/ASME Transactions on

Publisher

ieee

ISSN

1083-4435

Type

jour

DOI

10.1109/TMECH.2002.1011252

Filename

1011252