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RESEARCH PAPERS

Finite Element Analysis of the Coupled Journal and Thrust Bearing in a Computer Hard Disk Drive

[+] Author and Article Information
G. H. Jang

PREM, Department of Mechanical Engineering,  Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Republic of Koreaghjang@hanyang.ac.kr

S. H. Lee, H. W. Kim

PREM, Department of Mechanical Engineering,  Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Republic of Korea

J. Tribol 128(2), 335-340 (Oct 17, 2005) (6 pages) doi:10.1115/1.2162918 History: Received July 11, 2005; Revised October 17, 2005

This paper proposes a method to calculate the characteristics of a coupled fluid dynamic journal and thrust bearing of a hard disk drive (HDD) spindle motor. The governing equations for the journal and thrust bearings are the two-dimensional Reynolds equations in the θz and rθ planes, respectively. The finite element method is appropriately applied to analyze the coupled bearing under the conditions of the continuity of mass and pressure at the interface between the journal and thrust bearings. The pressure in the coupled bearing was calculated by applying the Reynolds boundary condition. The validity of this application was verified by comparing the analytical results of the flying height at various rotating speeds with experimental results. The characteristics of the coupled journal and thrust bearing were also investigated due to the Reynolds and Half-Sommerfeld boundary conditions and the coupled and separate analysis. This research demonstrates that the proposed method can accurately and realistically describe the coupled fluid dynamic bearing in a HDD system.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Structure of a 3.5in. HDD spindle motor with the FDBs

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Figure 2

Coordinate system of the coupled journal and thrust bearing in a HDD

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Figure 3

Boundary condition of the coupled journal and thrust bearing

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Figure 4

Finite element model and pressure distribution of the FDBs

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Figure 5

Simulated results of flying height at various rotating speeds

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Figure 6

Experimental results of flying height at various rotating speeds

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Figure 7

Comparison of the cavitation region of the journal bearing due to the internal boundary conditions: (a) Half-Sommerfeld BC and (b) Reynolds BC

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Figure 8

Cavitation region of the upper and the lower journal bearing in separate analysis: (a) upper journal bearing and (b) lower journal bearing

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