Fluid dynamics mechanism of disk flutter by measuring the pressure between disks

Author

Imai, Satomitsu

Author_Institution

Data Storage & Retrieval Syst. Div., Hitachi Ltd., Kanagawa, Japan

Volume

37

Issue

2

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

837

Lastpage

841

Abstract

The mechanism of disk flutter excitation in hard disk drives was experimentally examined in terms of the fluid dynamics. The sensors for measuring the pressure between the rotating disks were used. It was found that there was correlation between the pressure fluctuation amplitude and the flutter amplitude and that the pressure fluctuation was strongly influenced by the rotational speed and the disk-to-shroud spacing, especially in the outer disk. The pressure fluctuation was caused mainly by the winding of the flow in the disk rotational direction. This winding of the flow produced a nonuniform pressure distribution and it led to flutter excitation force. The pressure fluctuation and the disk flutter can be decreased by reducing the disk-to-shroud spacing which restricts the winding of the flow

Keywords

disc drives; hard discs; pressure sensors; vibrations; disk flutter; disk rotational direction; disk-to-shroud spacing; fluid dynamics mechanism; flutter amplitude; hard disk drives; nonuniform pressure distribution; pressure fluctuation amplitude; pressure sensors; rotational speed; Disk drives; Fluctuations; Fluid dynamics; Fluid flow measurement; Force measurement; Magnetic heads; Magnetic sensors; Pressure measurement; Rotation measurement; Vibration measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.917626

Filename

917626