Dynamics of a HDD spindle system due to the change of FDBs

Author

Jang, G.H. ; Park, K.Y.

Author_Institution

PREM, Hanyang Univ., Seoul

fYear

2009

fDate

14-16 Jan. 2009

Firstpage

1

Lastpage

2

Abstract

This research investigates the effect of FDBs on the dynamics of a HDD spindle system. Flying height of the HDD spindle system is determined by using the static analysis of the FDBs, and the stiffness and damping coefficients are calculated by using the dynamic analysis of the FDBs. Free vibration characteristics and shock response of the HDD spindle system are analyzed by using the finite element method and the mode superposition method. Experimental modal test is also performed to verify the accuracy of the proposed method. This research shows that the stiffness coefficients of journal bearing mostly affect the rocking frequencies because their magnitudes are within the range of the stiffness of supporting structure. It also shows that the damping coefficients of thrust bearing mostly affect the axial frequency because the stiffness of thrust bearing is much smaller that that of supporting structure.

Keywords

damping; disc drives; elastic constants; finite element analysis; hard discs; HDD spindle system; axial frequency; damping coefficients; finite element method; fluid dynamic bearing static analysis; flying height; free vibration; journal bearing; mode superposition method; rocking frequency; shock response; stiffness coefficients; thrust bearing; Damping; Electric shock; Finite element methods; Fluid dynamics; Frequency; Performance evaluation; Spinning; Spirals; Testing; Vibrations; Finite element method; Fluid dynamic bearing; Mode superposition method;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetic Recording Conference, 2009. APMRC '09. Asia-Pacific

Conference_Location

Singapore

Print_ISBN

978-9810-82191-3

Type

conf

DOI

10.1109/APMRC.2009.4925396

Filename

4925396