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Abstract

A Newton-Raphson scheme is used to solve the transient elastohydrodynamic lubrication line-contact problem with two-sided features and waviness for moderate loads. Surface features such as dents, bumps and waviness are studied; pressure and film thickness distributions in time are presented for each case. The analytical solution of Greenwood and Morales-Espejel for transient one-sided waviness is extended for two-sided waviness and the results compared with numerical simulations; they show again that the transient solution is made of two steady state components (one from each surface) travelling with each surface velocity and two propagated waves coming from the inlet (pumping-up effect from each surface) travelling with the average velocity of the lubricant. The results are in good agreement with theoretical predictions; they also establish the importance of the complementary function's shift of phase to determine the distributions of the pressure and the film thickness with time for a fixed location.

Keywords

transient EHL two-sided roughness

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Kinematics of two-sided surface features in elastohydrodynamic lubrication

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