Train-Induced Vibration Monitoring of Track Slab under Long-Term Temperature Load Using Fiber-Optic Accelerometers

Abstract

The train-induced vibration response provides a flexible solution for the real-time monitoring deformation of high-speed railway track slab in actual operation. This paper proposes a long-term real-time monitoring method for track slab deformation based on wavelet packet energy (WPE) using fiber optic accelerometers to record train-induced vibration. We found that the vibration response law of track slab deformation could be established by using the WPE of the frequency band covering the first- and second-order frequencies induced by the adjacent carriages. A field test was carried out for more than one year on the Beijing–Shanghai high-speed railway to investigate the train-induced vibration response law of track slab that was continuously deformed under a long-term temperature load. The maximum values of the WPE characteristic index appeared in winter and summer, and they were positively correlated with the temperature difference between the air environment and the track slab under the daily temperature load. These results were demonstrated to be consistent with the track slab deformation law for long-term and daily temperature loads. The novel method based on fiber optic accelerometers and WPE provides a new method for the long-term and real-time monitoring of track slab deformation.

Design study of a nonlinear electromagnetic converter using magnetic spring

“…This work concerns also the possibility to operate in different oscillating environments such as automotive vibrating devices and industrial equipment characterized by low vibration amplitudes and frequencies. Specifically, the conceived harvester can be employed to harvest energy from vibration induced by passing trains [12].…”

Random-Forest Machine Learning Approach for High-Speed Railway Track Slab Deformation Identification Using Track-Side Vibration Monitoring

“…Therefore, the real-time monitoring of track slab performance and the identification of the damage condition of track slabs are essential for long-term safe operation of the HSR. Existing track slab defect detection methods can be divided into three categories: visual inspection [15,16], nondestructive testing (NDT) [4,11,[17][18][19][20][21][22], and structural health monitoring (SHM) [23][24][25][26][27]. Most of the visual inspection methods rely on a variety of track inspection equipment, such as road rulers, gauges, and various customized equipment.…”

“…Therefore, with the aid of advanced sensing technology, real-time monitoring methods for track structure defects have been developed. Some approaches used fiber optic sensors for the real-time monitoring of track structure deformation caused by temperature [23], and for measuring the lateral displacement of the track structure [24]. Another approach used distributed fiber optics to monitor and locate cracks in the track slab [25] as well as to monitor the load deflection behavior of the track [26] and the arching deformation of the track slab [27].…”

Application Study on Fiber Optic Monitoring and Identification of CRTS-II-Slab Ballastless Track Debonding on Viaduct

“…The partners of the authors in this paper have developed interferometric fiber optic accelerometers for vibration measurement [39]. These sensors were used for measuring the vibration of a CRTS-II-slab track and investigating the relationship between temperature and track vibration [40]. Different from the previous investigations, a monitoring scheme that facilitates interlayer debonding detection of inservice CRTS II slab track and diminishes the influence of environmental and operational conditions on feature and indicator comparison is developed in this study.…”