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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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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