Estimation method of corrugation state based on wheel-rail vertical force

被引：0
|
作者：
Niu L.-B. [1 ]
Hu X.-Y. [2 ]
Yang F. [1 ]
Qiang W.-L. [1 ]
机构：
[1] Infrastructure Inspection Research Institute, China Academy of Railway Sciences Co., Ltd., Beijing
[2] Railway Science and Technology Research and Development Center, China Academy of Railway Sciences Co., Ltd., Beijing
来源：
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | 2023年 / 23卷 / 03期
关键词：
corrugation; grinding decision; high-speed railway; track dynamic detection; wheel-rail dynamics; wheel-rail relation;
D O I：
10.19818/j.cnki.1671-1637.2023.03.006
中图分类号：
学科分类号：
摘要：
In order to find out the mapping relationship between wheel-rail vertical force and corrugation state and to evaluate quantitatively the severity of the corrugation by using wheel-rail force inspection data, the typical parameters from CRTS II high-speed railway and electric multiple units in service in China were employed to construct a three-dimensional wheel-rail dynamics finite element model. The characteristics of the irregularities on the rail surface at the corrugation section were refined, and the simulation accuracy of the constructed model was verified by the time-frequency data of the measured wheel-rail vertical force from the high-speed comprehensive inspection car at the corrugation section in the high-speed railway. On this basis, the wheel-rail vertical forces excited by the corrugation with a wavelength between 40 mm and 180 mm at the running speed of 300 km · h-1were simulated, and their distribution characteristics in time-frequency domain were analyzed. The change rate of rail surface irregularity was introduced to characterize the changing characteristics of the corrugation along the longitudinal direction of the rail. The nonlinear least square method and rational equation were used to fit the functional relationship between the large values of the wheel-rail vertical force and the change rates of rail surface irregularity under different wavelengths. The influence of rail vibration mode of the Pinned-Pinned natural resonant frequency and its half-value on the fitting parameter curves was analyzed. A method based on the wheel-rail vertical force was derived to estimate the valley depth of the corrugation. The valley depth estimation method was tentatively tested in the high-speed railway to evaluate the corrugation, 32 sets of corrugation sections were found, and the measured and estimated valley depths at the sections were compared. Analysis results show that the correlation coefficient between the estimated and measured valley depths is 0. 97, so they have a high linear correlation. The root mean square error between the estimated and measured valley depths is approximately 0. 01 mm when the estimated valley depth is greater than 0. 08 mm, and the misjudgment rate in making decisions on rail grinding based on the estimated valley depth is approximately 6.25%, indicating that the estimation method of valley depth has good applicability in actual high-speed railway. © 2023 Chang'an University. All rights reserved.
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页码：89 / 102
页数：13
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