Many elastohydrodynamically lubricated contacts in practical applications, e.g., in bearings, operate in the starved lubrication regime. As a result their performance is sensitive to variations of the lubricant layers present on the surfaces, which form the supply to the contact. Their shape is often determined by previous overrollings of the track and also by replenishment mechanisms and various migration effects. Variations of the layers induced in the direction of rolling lead to a time-varying lubricant supply to the contact. In this paper, by means of numerical simulations using a starved lubrication model, the film thickness modulations in the center of the contact induced by a harmonically varying inlet supply have been investigated. First, for a given load condition and layer wavelength, the effect of the nominal layer thickness (degree of starvation) and the layer variation amplitude is illustrated. Subsequently, using results for different load conditions, wavelengths, and degrees of starvation, it is shown that the response of the contact to such variations is determined by a nondimensional parameter, which represents the ratio of the entrainment length of the contact to the wavelength of the induced variation, and by the degree of starvation. A simple formula is presented for use in engineering predicting the ratio of the amplitude of the film modulations in the center of the contact to the amplitude of the layer variations in the inlet.
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October 2008
Research Papers
Film Thickness Modulations in Starved Elastohydrodynamically Lubricated Contacts Induced by Time-Varying Lubricant Supply
C. H. Venner,
C. H. Venner
Faculty of Engineering Technology, Department of Engineering Fluid Dynamics,
University of Twente
, P.O. Box 217, 7500 AE Enschede, The Netherlands
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G. Popovici,
G. Popovici
SKF Engineering and Research Centre
, P.O. Box 2350, 3430 DT Nieuwegein, The Netherlands
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P. M. Lugt,
P. M. Lugt
SKF Engineering and Research Centre
, P.O. Box 2350, 3430 DT Nieuwegein, The Netherlands
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M. Organisciak
M. Organisciak
LAMCOS,
INSA de Lyon
, 20 Avenue Albert Einstein, 69621 Villeurbanne Cedex, France
Search for other works by this author on:
C. H. Venner
Faculty of Engineering Technology, Department of Engineering Fluid Dynamics,
University of Twente
, P.O. Box 217, 7500 AE Enschede, The Netherlands
G. Popovici
SKF Engineering and Research Centre
, P.O. Box 2350, 3430 DT Nieuwegein, The Netherlands
P. M. Lugt
SKF Engineering and Research Centre
, P.O. Box 2350, 3430 DT Nieuwegein, The Netherlands
M. Organisciak
LAMCOS,
INSA de Lyon
, 20 Avenue Albert Einstein, 69621 Villeurbanne Cedex, FranceJ. Tribol. Oct 2008, 130(4): 041501 (10 pages)
Published Online: August 1, 2008
Article history
Received:
December 8, 2006
Revised:
May 29, 2008
Published:
August 1, 2008
Citation
Venner, C. H., Popovici, G., Lugt, P. M., and Organisciak, M. (August 1, 2008). "Film Thickness Modulations in Starved Elastohydrodynamically Lubricated Contacts Induced by Time-Varying Lubricant Supply." ASME. J. Tribol. October 2008; 130(4): 041501. https://doi.org/10.1115/1.2958069
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