Analysis on Essential Characteristics of the Polygonal Wear of Locomotive Wheels and Its Effect on Wheel/Rail Dynamic Impact

doi:10.3901/JME.2021.04.130

Abstract

Abstract: Serious wheel polygonal wear usually causes violent interactions between wheel and rail, which reduces the fatigue life of vehicle-track system and threats the running safety of the train. To investigate the essential characteristics of the polygonal wear of locomotive wheels as well as its effects on the locomotive vibrations, extensive measurements of wheel polygonal wear of electric locomotives are conducted, and the vibration performance of normal-operated and abnormal-operated locomotives are also obtained. To figure out the effect of wheel re-profiling on elimination of wheel polygonal wear, tracking measurements of wheel polygonal wear during one re-profiling period are conducted. The test results show that the high-order polygonal wear of the locomotive wheel is the main cause of abnormal vibrations of locomotive wheelset; the wheels of normal operational locomotives mainly exhibit low-order polygonal wear. However the wheels with frequent occurrence of abnormal vibration contain obvious 15～25 order polygonal wear by contrast, the corresponding center wavelength is in the range of 158～250 mm. The high-order polygonal wear cannot be removed thoroughly by the Q-type under-floor wheel lathe, and developed significantly after a period of service. Based on the locomotive-track dynamic simulation, the effect of the characteristics of the polygonal wear on dynamic interaction of wheel/rail system is analyzed systematically, and the safety limits of the polygonal wear are put forward.

Key words: electric locomotive, polygonal wear of wheels, abnormal vibration, locomotive/track coupled dynamics, safety limits

CLC Number:

U213

YANG Yunfan, LIU Zhiqiang, GAO Xianbo, LING Liang, WANG Kaiyun, ZHAI Wanming. Analysis on Essential Characteristics of the Polygonal Wear of Locomotive Wheels and Its Effect on Wheel/Rail Dynamic Impact[J]. Journal of Mechanical Engineering, 2021, 57(4): 130-139.

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