Numerical solution on the mixed lubrication of wheel/rail contact interface under wet conditions

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (19) : 261-268.

WANG Xiaopeng,PENG Wenyu,ZHAO Xinze,TIAN Hongliang,XI Neng, ZHAO Meiyun

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Abstract

The contact interface of wheel/rail is situated in mixed lubrication state under the conditions of rain, snow or humid environment. The fluid dynamic pressure effect is obvicus, causing the adhesion coefficient to decrease, which results in the decrease of adhesion. A mixed lubrication model was established with considering the real surface roughness of the elliptical contact. A numerical simulation was carried out on the lubrication state of the rolling contact interface of wheel/rail and the calculation solutions for the rough machined surface and the smooth surface were compared. The results show that the adhesion coefficient is mainly depended on the ratio of asperity contact pressure to the total pressure in mixed lubrication. When the train is running with high speed, the wheel/rail contact interface is in mixed lubrication conditions and the adhesion coefficient is small. So, it is not conductive to the train operating safety and smoothness under water lubrication with high speed. Compared with dry contact, the wheel/rail contact pair has smaller contact pressure peak under mixed lubrication with water medium. And mixed lubrication is beneficial to improve the service life of wheel/rail contact pairs. The study provides a theoretical foundation for the surface design of wheel and rail systems.

Key words

Wheel/Rail / Mixed elastohydrodynamic lubrication / Rough surface / Water lubrication / Adhesion

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WANG Xiaopeng,PENG Wenyu,ZHAO Xinze,TIAN Hongliang,XI Neng, ZHAO Meiyun. Numerical solution on the mixed lubrication of wheel/rail contact interface under wet conditions[J]. Journal of Vibration and Shock, 2019, 38(19): 261-268

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