Anharmonic variations in elastohydrodynamic film thickness resulting from harmonically varying entrainment velocity

2009 ◽  
Vol 224 (3) ◽  
pp. 239-247 ◽  
Author(s):  
P Kumar ◽  
M M Khonsari ◽  
S Bair
Keyword(s):  
Film Thickness ◽  
Entrainment Velocity ◽  
Elastohydrodynamic Film Thickness

Paper 14: Measurement of Film Thickness in a Taper Roller Bearing

1969 ◽  
Vol 184 (12) ◽  
pp. 103-110
Author(s):  
D. A. Jones ◽  
A. B. Crease
Keyword(s):  
Film Thickness ◽  
Surface Finish ◽  
Thrust Bearing ◽  
Roller Bearing ◽  
Rolling Contacts ◽  
Rolling Elements ◽  
Elastohydrodynamic Film Thickness ◽  
Taper Roller Bearing

This paper describes an attempt to measure the elastohydrodynamic film thickness generated within the rolling contacts of a conventional taper roller thrust bearing. The technique used is simple and unambiguous and should be capable of application irrespective of the surface finish or geometry of the rolling elements.

The effect of an oscillatory entrainment velocity on the film thickness in thermal EHL point contact

2015 ◽  
Vol 90 ◽  
pp. 519-532 ◽  
Author(s):  
Jianjun Zhang ◽  
Peiran Yang ◽  
Jing Wang ◽  
Feng Guo
Keyword(s):  
Film Thickness ◽  
Point Contact ◽  
Entrainment Velocity ◽  
Thermal Ehl

Quantitative elastohydrodynamic film thickness of mechanically degraded oil

2013 ◽  
Vol 64 ◽  
pp. 33-38 ◽  
Author(s):  
Scott Bair ◽  
Ivan Krupka ◽  
Petr Sperka ◽  
Martin Hartl
Keyword(s):  
Film Thickness ◽  
Elastohydrodynamic Film Thickness

Study of Elastohydrodynamic Film Shape Under Different Directions of Velocity Vectors

2011 ◽  
Author(s):  
Milan Omasta ◽  
Ivan Krupka ◽  
Martin Hartl
Keyword(s):  
Thin Film ◽  
Experimental Study ◽  
Film Thickness ◽  
Velocity Vector ◽  
Point Contact ◽  
Sliding Velocity ◽  
Hypoid Gears ◽  
Entrainment Velocity ◽  
Vector Direction

Some machines elements such as hypoid gears and Wildhaber-Novikov gears works under conditions where the surface velocities are variously oriented, thus the entrainment and sliding velocities act at different directions. The influence of sliding velocity vector direction with respect to entrainment velocity vector has not been sufficiently determined yet. So, the aim of current experimental study is to investigate effect of slide-to-roll ratio and direction of sliding velocity vector with respect to entrainment velocity vector on elastohydrodynamic (EHD) film thickness using thin-film colorimetric interferometry in smooth glass-steel point contact.

Surface roughness modification in elastohydrodynamic line contacts operating in the elastic piezoviscous regime

1998 ◽  
Vol 212 (2) ◽  
pp. 145-162 ◽  
Author(s):  
C. J. Hooke
Keyword(s):  
Surface Roughness ◽  
Spatial Distribution ◽  
Analytical Solution ◽  
Film Thickness ◽  
Numerical Solutions ◽  
Entrainment Velocity ◽  
Original Surface ◽  
Ehd Lubrication ◽  
Line Contacts

In heavily loaded elastohydrodynamic (EHD) lubrication contacts operating in the piezoviscous regime, the original surface roughness is largely flattened as it enters the conjunction and is replaced by an inlet generated clearance variation. This clearance variation is convected through the contact at the entrainment velocity. It has a spatial distribution that differs (except for rolling without slip) from the original surface and a different amplitude. This amplitude may be smaller or greater than that of the original profile. An analytical solution of this behaviour is presented for contacts operating well inside the elastic piezoviscous regime for the situation where the roughness is relatively small compared with the film thickness. This solution allows the main features of surface roughness modification to be understood and produces results that compare well with the few numerical solutions available.

Elastohydrodynamic Film Thickness and Tractions for Oil-in-Water Emulsions

2004 ◽  
Vol 47 (1) ◽  
pp. 123-129 ◽  
Author(s):  
HAIXIA YANG ◽  
STEVEN R. SCHMID ◽  
THOMAS J. KASUN ◽  
RONALD A. REICH
Keyword(s):  
Film Thickness ◽  
Oil In Water ◽  
Elastohydrodynamic Film Thickness
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