A Theoretical Analysis Considering Cavitation Occurrence in Oil-Lubricated Spiral-Grooved Journal Bearings With Experimental Verification

[+] Author and Article Information
Tomoko Hirayama

Department of Mechanical and Systems Eng., Ryukoku Univ., Japan

Takeo Sakurai

Department of Precision Eng., Graduate School of Eng., Kyoto Univ., Japan

Hiroshi Yabe

Department of Mechanical Eng., Osaka Electro-Communication Univ., Japan

J. Tribol 126(3), 490-498 (Jun 28, 2004) (9 pages) doi:10.1115/1.1691436 History: Received April 12, 2002; Revised July 24, 2003; Online June 28, 2004
Copyright © 2004 by ASME
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Folberg, L., and Jakobsson, B., 1957, “The Finite Journal Bearing Considering Vaporization,” Trans. Chalmers Univ. Tech., Goteborg, 190 , pp. 1–116.
Olsson, K., 1965, “Cavitation in Dynamically Loaded Bearings,” Trans. Chalmers Univ. Tech., Goteborg.
Elrod, H. G., and Adams, M. L., 1974, “A Computer Program for Cavitation and Starvation Program,” Cavitation and Related Phenomena in Lubrication, Mechanical Engineering Publications for the Institute of Tribology, The University of Leeds, England, pp. 33–41.
Elrod,  H. G., 1981, “A Cavitation Algorithm,” ASME J. Lubr. Technol., 103(3), pp. 350–354.
Jang,  G. H., and Chang,  D. I., 2000, “Analysis of a Hydrodynamic Herringbone Grooved Journal Bearing Considering Cavitation,” ASME J. Tribol., 122(1), pp. 103–109.
Hirs,  G. G., 1965, “The Load Capacity and Stability Characteristics of Hydrodynamic Grooved Journal Bearings,” ASLE Trans., 8(3), pp. 296–305.
Ikeuchi,  K., and Mori,  H., 1987, “The Effects of Cavity Fluctuation on the Elastic and Damping Properties of Journal Bearings,” Trans. Jpn. Soc. Mech. Eng., Ser. C , 53(485), pp. 136–143 (in Japanese).
Kobayashi,  T., 1999, “Numerical Analysis of Herringbone-Grooved Gas-Lubricated Journal Bearings Using a Multigrid Technique,” ASME J. Tribol., 121(1), pp. 148–156.
Kawabata,  N., 1988, “A Study on the Numerical Analysis of Fluid Film Lubrication by the Boundary Fitted Coordinates System,” JSME Int. J., Ser. III, 31(1), pp. 107–113.
Kawabata,  N., Ozawa,  Y., Kamaya,  S., and Miyake,  Y., 1989, “Static Characteristics of the Regular and Reversible Rotation Type Herringbone Grooved Journal Bearing,” ASME J. Tribol., 111(3), pp. 484–490.
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A schematic diagram of hard disk drive system with spiral-grooved bearing
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Geometry of a spiral-grooved journal bearing
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Section of finite difference grid and control domain
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Schematic diagram of a spiral-grooved journal bearing
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Computational procedure
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Theoretical pressure maps under an eccentric state (ε=0.2, SMR system, “non-ground-down” type bearing): (a) for the case with neglecting the cavitation occurrence; and (b) for the case with considering the cavitation occurrence by equivalent flow model.
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Pressure distributions on Q-Q section in Fig. 6
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Experimental apparatus (upper shows the schematic diagram and lower the photo)
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Cavitation regions in the bearing clearance (350 rpm, nonground-down type, 38.5 degrees centigrade; left: experimental photos, right: analytical cavitation contour charts): (a) at concentric state; and (b) at eccentric state (ε=0.3).
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An example of establishment of experimental data by pressure measurements
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Experimental and theoretical pressure distributions on A and B sections (350 rpm, nonground-down type, 38.5 degrees centigrade): (a) on A section; and (b) on B section.
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Cavitated area ratio versus eccentricity ratio
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Load capacity and attitude angle versus eccentricity ratio (usage of symbols and lines is in the same manner as in Fig. 12): (a) load capacity; and (b) attitude angle.
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Bearing stiffnesses versus eccentricity ratio (usage of symbols and lines is in the same manner as in Fig. 12): (a) direct bearing stiffness; and (b) cross-coupling bearing stiffness.



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