Research on ultrasonic-based wheel-rail contact patch and stress detection system

被引：0

作者：

Pan, Gao ^{[1
]}

Wang, Xuemei ^{[1
]}

Ni, Wenbo ^{[1
]}

Ding, Junjun ^{[1
]}

机构：

[1] School of Mechanical Engineering, Southwest Jiaotong University, Chengdu,610031, China

来源：

Journal of Railway Science and Engineering | 2022年 / 19卷 / 09期

关键词：

Contact patch - Contact state - Contact Stress - Contact stress distributions - Pressure reflections - Sound pressure reflection coefficient - Sound pressures - Stresses distribution - Wheel-rail - Wheel/rail contact;

D O I：

10.19713/j.cnki.43-1423/u.T20211158

中图分类号：

学科分类号：

摘要：

Aiming at the problem that it is difficult to effectively detect wheel-rail contact patch and contact stress distribution, a system suitable for static wheel-rail contact state detection was designed according to the quasi-static spring model of the contact surface and ultrasonic pulse reflection method. The system used a water-immersed spot focusing ultrasonic probe for detection, which was mainly composed of mechanical parts, ultrasonic excitation, and acquisition system, contact patch and stress analysis display system. The mechanical parts included a wheel-rail loading mechanism and a two-axis scanning mechanism, which respectively realized the fixation and loading of the wheel-rail, and the planar scanning movement of clamping the ultrasonic probe. The ultrasonic excitation and acquisition system realized the motion control of the scanning mechanism, and the excitation, acquisition and transmission of ultrasonic data and the reception of corresponding command. The contact patch and stress analysis display system realized the reception and processing of ultrasonic data, as well as the real-time display and storage of test results. Before the tests, the calibration experiment was carried out to establish the relationship between the ultrasonic sound pressure reflection coefficient and the contact stress. Then the wheel-rail contact patch and stress distribution detection experiment was done, and the contact patch and stress distribution image of the wheel-rail specimen under 20～70 kN load were obtained. Finally, cubic spline interpolation was used to optimize the results. The experimental results show that the proposed detection method and designed system can effectively detect the static wheel-rail contact patch geometry and its contact stress distribution, reflecting the real wheel-rail contact state. It is of great significance for wheel-rail optimization design, lifetime prediction and track maintenance. © 2022, Central South University Press. All rights reserved.

引用

页码：2720 / 2729