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TECHNICAL PAPERS

A Study on Rolling Element Skew Measurement in a Tapered Roller Bearing With a Specialized Capacitance Probe

[+] Author and Article Information
Yeyuan Yang, Steven Danyluk

Georgia Institute of Technology, George W. Woodruff School of Mechanical Engineering, Atlanta, GA 30332-0405

Michael Hoeprich

The Timken Company, Canton, OH 44706-0927

J. Tribol 122(3), 534-538 (Sep 21, 1999) (5 pages) doi:10.1115/1.555397 History: Received November 23, 1998; Revised September 21, 1999
Copyright © 2000 by ASME
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References

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Palmgren, A., 1959, Ball and Roller Bearing Engineering, 3rd ed., Burbank, PA.
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Zanoria,  E. S., Hamall,  K., Danyluk,  S., and Zharin,  A. L., 1997, “The Nonvibrating Kelvin Probe and its Application for Monitoring Surface Wear,” J. Test. Eval., 25, pp. 233–238.
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Nonnenmacher,  M., O’Boyle,  M., and Wickramasinghe,  H. K., 1992, “Surface Investigations with a Kelvin Probe Force Microscope,” Ultramicroscopy, 42–44, pp. 268–273.
Yano, D., 1997, “Application of a Contact Potential Difference Probe to Detection of Nano-Meter Thick Lubricant on a Hard Disk,” M. S. thesis, Georgia Institute of Technology, Atlanta, GA.
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Figures

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Relationship of skew angle with speed under two lubrications
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Comparison of CPD signal from two channels, the phase difference between two channels varies with lubrication condition: (a) under oil lubrication; (b) large end of the roller lubricated with grease.
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The typical CPD signal generated by a roller passing beneath the probe
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Calculated between the probe and roller surface for various probe/roller spacings and speed
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(a) Coordinate frames for calculating capacitance between roller and probe (side view), and (b) sub-coordinate for integrating capacitance within the probe (top view)
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A schematic showing how to generate the capacitance between the CPD probe and the bearing roller (a), and the motion of roller relative to probe (b)
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Graphical representation for mathematical calculation of the skew angle
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A schematic of experimental setup

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