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Research Papers: Magnetic Storage

An Efficient FE Analysis for Complex Low Flying Air-Bearing Slider Designs in Hard Disk Drives—Part I: Static Solution

[+] Author and Article Information
Puneet Bhargava

Department of Mechanical Engineering, Computer Mechanics Laboratory, University of California, Berkeley, Berkeley, CA 94720puneet@cml.me.berkeley.edu

David B. Bogy

Department of Mechanical Engineering, Computer Mechanics Laboratory, University of California, Berkeley, Berkeley, CA 94720

J. Tribol 131(3), 031902 (Jun 15, 2009) (10 pages) doi:10.1115/1.3140606 History: Received October 05, 2006; Revised June 01, 2008; Published June 15, 2009

Prediction of the steady state flying height and attitude of air-bearing sliders in hard disk drives via simulations is the basis of their design process. Over the past few years air-bearing surfaces have become increasingly complex incorporating deep etches and steep wall profiles. In this paper we present a novel method of solving the inverse problem for air-bearing sliders in hard disk drives that works well for such new designs. We also present a new method for calculating the static air-bearing stiffness by solving three linear systems of equations. The formulation is implemented, and convergence studies are carried out for the method. Mesh refinements based on flux jumps and pressure gradients are found to work better than those based on other criteria.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

System coordinate system

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Figure 2

Coarse level system matrix fill pattern

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Figure 3

Slider designs and coarse level meshes used for simulations

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Figure 4

Grid convergence for Slider 1 forward problem

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Figure 5

Force error for Slider 1 forward problem

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Figure 6

Converged pressure profile for Slider 1

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Figure 7

Grid convergence for Slider 1 using various refinement strategies

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Figure 8

Grid convergence for Slider 2 using various refinement strategies

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Figure 9

Grid convergence for Slider 1 inverse problem

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Figure 10

Mesh levels for Slider 1 inverse problem

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Figure 11

Grid convergence for Slider 2 inverse problem

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Figure 12

Grid convergence for Slider 3 inverse problem

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