Estimation of wheel/rail adhesion coefficient under wet condition with measured boundary friction coefficient and real contact area

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• 作者：Hua Chen^a ; ^{chen@rtri.or.jp"" rel=""nofollow} ; Makoto Ishida^a ; Akira Namura^a ; Koan-Sok Baek^b ; Tsunamitsu Nakahara^c ; Bruno Leban^d ; Massimiliano Pau^d
• 关键词：Wheel/rail ; Adhesion ; Wet ; Boundary friction coefficient ; Ultrasonic wave
• 刊名：Wear
• 出版年：2011
• 出版时间：18 May 2011
• 年：2011
• 卷：271
• 期：1-2
• 页码：32-39
• 全文大小：1537 K

文摘

This paper describes how to improve the prediction method of the adhesion coefficient by means of the experimentally estimated boundary friction coefficient obtained by two kinds of twin-disc rolling contact machines and the ratio of real contact area to nominal contact area (RCA/NCA) obtained by ultrasonic measurement. The previous prediction method that the authors had already proposed in the last paper was based on Greenwood–Tripp's rough surface contact model; however, in this study, the authors adopted Lee & Ren's rough surfaces contact model and focused on the RCA/NCA measured by ultrasonic wave in order to predict the adhesion coefficient under wet conditions with the actual surface contact conditions. As a result, regarding the tendency of adhesion coefficient decreasing with an increase of running speed, a good agreement has been obtained between the results obtained by the prediction method proposed in this study and the measured results obtained by the field-test of Japanese Shinkansen vehicle (series 200).