地铁波磨对轮轨动力特性影响及其安全阈值分析

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Abstract The rail corrugation and the rail vibration accelerations in the common track bed section on a metro line were measured. The vehicle-track coupling dynamic model for metro was established to analyze the influences of rail corrugation with different characteristics on the wheel-rail system dynamic characteristics and to propose the wave depth safety threshold for rail grinding to control corrugation were determined. The results showed that rail corrugation mainly occurs on the inner rail in the small radius curve section with the main wavelength of 200~250mm and the maximum wave depth about 0.8mm. The short-pitch corrugation appears in the straight section with the main wavelength of 40mm and the maximum depth of 0.1mm. The main wavelength of rail corrugation corresponds to the main frequency of the vibration of rail structure. The rail corrugation, especially the short-pitch corrugation with wavelength below 70mm, causes strong vibration of rail structure and deteriorates the wheel-rail interaction. The wheel-rail vertical force fluctuates periodically with the wavelength of corrugation, which in one period the impact vibration of wheel-rail system reaches the peak value at 1/4 wavelength. The influence of rail corrugation on the wheel-rail dynamic response decreases with wavelength and increases with wave depth. The corrugation safety limits for rail grinding in the existing regulations are applicable to long-wavelength corrugation, but for the short-pitch corrugation with wavelength below 70mm, the corresponding wave depth safety threshold values of 30, 40, 50 and 60mm are recommended to be 0.08, 0.11, 0.12 and 0.21mm respectively at the speed of 80 km/h. It is needed to grind the rail in time when the wave depth of corrugation exceeds the safety threshold.

Key words： metro rail corrugation field measurement vehicle-track coupled dynamics safety threshold

Received: 22 October 2020 Published: 15 March 2022

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	Articles by authors
	ZHANG Pengfei
	YAO Dian
	FENG Qingsong
	LEI Xiaoyan
	LIU Qingjie

Cite this article:

ZHANG Pengfei,YAO Dian,FENG Qingsong, et al. Effects of metro rail corrugation on wheel-track system dynamic characteristics and its wave depth safety threshold[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(5): 123-130.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I5/123

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