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TECHNICAL PAPERS

An Asperity Contact Model for the Slider Air Bearing

[+] Author and Article Information
Weidong Huang, David B. Bogy

Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94710

Masayuki Honchi

Hitachi, Ltd., 2880 Kozu, Odawara-shi, Kanagawa-ken, 256 Japan

J. Tribol 122(2), 436-443 (Jun 29, 1999) (8 pages) doi:10.1115/1.555379 History: Received February 04, 1999; Revised June 29, 1999
Copyright © 2000 by ASME
Topics: Force , Bearings , Disks
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References

Anaya-Dufresne,  M., and Sinclair,  G. B., 1997, “On the Breakdown under Contact Conditions of Reynolds Equation for Gas Lubricated Bearings,” ASME J. Tribol., 119, pp. 71–75.
Huang,  W., and Bogy,  D. B., 1998, “An investigation of a Slider Air Bearing with an Asperity Contact by a Three-Dimensional Direct Simulation Monte Carlo Method,” IEEE Trans. Magn., 34, No. 4, pp. 1810–1812.
Cha,  E., and Bogy,  D. B., 1995, “Numerical Simulations of Slider Interaction with Multiple Asperity Using Hertzian Contact Model,” ASME J. Tribol., 117, pp. 575–579.
Greenwood,  J. A., and Williamson,  J. B. P., 1966, “Contact of Nominally Flat Surface,” Proc. R. Soc. London, Ser. A, 295, pp. 300–319.
Chang,  W. R., Etsion,  I., and Bogy,  D. B., 1987, “An Elastic-Plastic Model for the Contact of Rough Surfaces,” ASME J. Tribol., 109, pp. 257–263.
Hu, Y., 1996, “Head-Disk-Suspension Dynamics,” Doctoral Dissertation, Dept. of Mechanical Engineering, University of California at Berkeley.
Wahl,  M. H., Kwon,  H., and Talke,  F. E., 1997, “Simulation of Asperity Contacts at the Head/Disk Interface of Tri-Pad Sliders During Steady-State Flying,” Tribol. Trans., 40, No. 1, pp. 75–80.
Lacey,  C. A., and Talke,  F. E., 1992, “Measurement and Simulation of Partial Contact at the Head/Tape Interface,” ASME J. Tribol., 114, pp. 646–652.
Mitsuya,  Y., 1984, “A Simulation Method for Hydrodynamic Lubrication of Surface with Two-Dimensional Isotropic or Anisotropic Roughness Using Mixed Averaged Thickness,” Bull. JSME, 27, No. 231, pp. 2036–2044.
Mitsuya,  Y., Ohkubo,  T., and Ota,  H., 1989, “Averaged Reynolds Equation Extended to Gas Lubrication Possessing Surface Roughness in the Slip Flow Regime: Approximate Method and Confirmation Experiments,” ASME J. Tribol., 111, pp. 495–503.
Mitsuya,  Y., and Hayashi,  T., 1990, “Numerical Study of Film Thickness Averaging in Compressible Lubricating Films Incurring Stationary Surface Roughness,” ASME J. Tribol., 112, pp. 230–237.
Patir,  N., and Cheng,  H. S., 1978, “An Average Flow Model for Determining the Effects of Three-Dimensional Roughness on Partial Hydrodynamic Lubrication,” ASME J. Lubr. Technol., 100, pp. 12–17.
Patir,  N., and Cheng,  H. S., 1979, “Application of Average Flow Model to Lubrication between Rough Sliding Surfaces,” ASME J. Lubr. Technol., 101, pp. 220–230.
Bhushan,  B., Yang,  L., Gao,  G., Suri,  S., Miller,  R. A., and Marchon,  B., 1995, “Friction and Wear Studies of Magnetic Thin-film Rigid Disks with Glass-ceramic, Glass and Aluminum-magnesium Substrates,” Wear, 190, pp. 44–59.
Huang,  W., Bogy,  D. B., and Garcia,  A. L., 1997, “Three-Dimensional Direct Simulation Monte Carlo Method for Slider Air Bearings,” Phys. Fluids, 9, pp. 1764–1769.
Machcha,  A., McMillan,  T., and Talke,  F. E., 1996, “The Tribology of Tri-Pad Sliders with Hydrogenated and Nitrogenated Disks,” IEEE Trans. Magn., 32, p. 5.
Lu, S., 1997, “Numerical Simulation of Slider Air Bearings,” Doctoral Dissertation, Dept. of Mechanical Engineering, University of California at Berkeley.

Figures

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Effect of the STD of the asperity height on the 50 percent tri-pad slider. (a) Contact air bearing force; (b) flying height; (c) pitch angle.
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Effect of RPM on the 50 percent Nutcracker slider. (a) Contact air bearing force; (b) flying height; (c) pitch angle.
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Contact air bearing force comparison between DSMC and MGL with NFZ condition added
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Air bearing surface of the tri-pad slider
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Effect of rpm on the 50 percent tri-pad slider. (a) Contact air bearing force; (b) flying height; (c) pitch angle.
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Effect of the radial position on the 50 percent tri-pad slider. (a) Contact air bearing force; (b) flying height; (c) pitch angle.
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Effect of RPM on the 30 percent tri-pad slider. (a) Contact air bearing force; (b) flying height; (c) pitch angle.
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Number of the contact asperity for the 30 percent tri-pad slider
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GW contact force for the 30 percent tri-pad slider
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Contact forces at different disk speeds
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Air bearing surface of the Nutcracker slider

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