The Verification of Rail Thermal Stress Measurement System

  • Duan Xiangyu School of Mechanical, Electronic Control Engineering, Beijing Jiaotong University, No.3 Shangyuancun, Haidian District, Beijing 100044, China; Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology (Beijing Jiaotong University), Ministry of Education, No.3 Shangyuancun, Haidian District Beijing 100044, China
  • Zhu Liqiang School of Mechanical, Electronic Control Engineering, Beijing Jiaotong University, No.3 Shangyuancun, Haidian District, Beijing 100044, China; Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology (Beijing Jiaotong University), Ministry of Education, No.3 Shangyuancun, Haidian District Beijing 100044, China
  • Yu Zujun School of Mechanical, Electronic Control Engineering, Beijing Jiaotong University, No.3 Shangyuancun, Haidian District, Beijing 100044, China; Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology (Beijing Jiaotong University), Ministry of Education, No.3 Shangyuancun, Haidian District Beijing 100044, China
  • Xu Xining School of Mechanical, Electronic Control Engineering, Beijing Jiaotong University, No.3 Shangyuancun, Haidian District, Beijing 100044, China; Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology (Beijing Jiaotong University), Ministry of Education, No.3 Shangyuancun, Haidian District Beijing 100044, China

Abstract

Continuous Welded Rail (CWR) is widely used in modern railways. With the absence of the expansion joints, CWR cannot expansion freely when the temperature changes, which could cause buckling in hot weather or breakage in cold weather. Therefore, rail thermal stress measuring system plays an important role in the safe operation of railways. This paper designed a thermal stress measurement system based on the acoustoelastic effect of the ultrasonic guided wave. A large-scale rail testbed was built to simulate the thermal stress in the rail track, and to establish the relationship of time-delay of guided wave and thermal stress. After laboratory testing, the system was installed in several railway lines in China for field tests. The results showed that the system was stable and accurate in stress measurement. The performance and potentials of the system were discussed.

Keywords: system verification, continuous welded rail, thermal stress, guided wave
Published online
2019-04-16
How to Cite
Xiangyu, D., Liqiang, Z., Zujun, Y. and Xining, X. “The Verification of Rail Thermal Stress Measurement System”, Periodica Polytechnica Transportation Engineering. doi: https://doi.org/10.3311/PPtr.12062.
Section
Articles