Axial Shock-Induced Motion of the Air-Oil Interface of Fluid Dynamic Bearings of a Non-Operating Hard Disk Drive

Author

Jung, K.M. ; Jang, G.H.

Author_Institution

Dept. of Mech. Eng., Hanyang Univ., Seoul, South Korea

Volume

47

Issue

7

fYear

2011

fDate

7/1/2011 12:00:00 AM

Firstpage

1911

Lastpage

1917

Abstract

We investigated the axial shock-induced motion of the air-oil interface of the fluid dynamic bearings (FDBs) of a non-operating (HDD) by experiment and simulation. We empirically determined the motion of the rotor with respect to the stator and the oil leakage due to axial shock. We applied the finite volume method and the volume of fluid method to simulate the axial shock-induced motion of the fluid lubricant of FDBs considering the two-phase flow of air and oil and the surface tension at the air-oil interface. The thrust plate and shaft were assumed to move as a rigid body. Our findings allow us to explain the phenomenon of the break-up of the air-oil interface of FBDs caused by axial shock. We also discuss the effects of the magnitude of the shock and oil viscosity on the break-up of the air-oil interface.

Keywords

disc drives; finite volume methods; hard discs; lubricants; machine bearings; rotors; shock waves; two-phase flow; FDB; HDD; air-oil interface; axial shock-induced motion; finite volume method; fluid dynamic bearings; fluid lubricant; nonoperating hard disk drive; oil viscosity; surface tension; thrust plate; two-phase flow; Atmospheric modeling; Electric shock; Lubricants; Mathematical model; Numerical models; Rotors; Viscosity; Air-oil interface; break-up phenomena; fluid dynamic bearings (FDBs); non-operating shock; two-phase flow;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2134838

Filename

5928993