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TECHNICAL PAPERS

Effects of Load System Dynamics on the Film Thickness in EHL Contacts During Start Up

[+] Author and Article Information
G. Popovici, C. H. Venner

University of Twente, Faculty of Engineering Technology, Dept. of Engineering Fluid Dynamics, P.O. Box 217, 7500 AE Enschede, The Netherlands

P. M. Lugt

SKF ERC b.v., P.O. Box 2350, 3430 DT Nieuwegein, The Netherlands

J. Tribol 126(2), 258-266 (Apr 19, 2004) (9 pages) doi:10.1115/1.1645296 History: Received February 13, 2003; Revised July 14, 2003; Online April 19, 2004
Copyright © 2004 by ASME
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References

Figures

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Film thickness h at y=0 at different times after start up for ā=50 [m/s2 ] and K̄=1.0 (a), K̄=2.0, (b), and K̄=4.0 (c)
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Central film thickness hc (top) and mutual approach δ (bottom) as a function of time t for ā=50 and K̄=0.0, 1.0, 2.0, and 4.0. Ω=5.13
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Pseudo Interference plot of the dimensionless film thickness H as a function of X and Y at different times in the simulation of start up for Ω=5.13 and K̄=4.0. Displayed are from top to bottom t=6, 9, 12, 15, and 180 [ms].
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(a) Loading system with lever and mass, (b) Representation as single mass system, and (c) Simplification to only inertia effect
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Central film thickness hc as a function of time t for different accelerations ā=50, 20, 10, and 5 [m/s2 ] as measured on a ball on disc apparatus
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Film thickness h at y=0 (centerline) as a function of x at different times when starting up with different accelerations ā=“∞” (top left), 50 (top right), 20 (bottom left), and 10 (bottom right) [m/s2 ]
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Pressure p at y=0 (centerline) as a function of x at different times when starting for ā=“∞”
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Central film thickness hc (top) and mutual approach (bottom) as a function of time t for different accelerations ā=∞, 50, 20, 10, and 5 [m/s2 ]
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Central film thickness hc (top) and mutual approach δ (bottom) as a function of time t for ā=∞ and Ω=2.56, 5.13, 10.26, and 20.52

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