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.
Highlights
Ballastless track is a track structure that guarantees the reliable operation of highspeed railways due to its high smoothness, high stability, and low maintenance [1]
This paper proposes a long-term and real-time monitoring method for deformed track slabs based on wavelet packet energy (WPE) using fiber optic accelerometers to record traininduced vibration
The China Railway Track System (CRTS) II track slab was laid on a high-speed railway with a high embankment, which was a laminated structure that mainly consisted of a rail and fastener system, concrete track slab, cement asphalt (CA) mortar layer, concrete supporting layer, and roadbed from top to bottom [6]
Summary
Ballastless track is a track structure that guarantees the reliable operation of highspeed railways due to its high smoothness, high stability, and low maintenance [1]. The train-induced vibration response monitoring method [14,15] is based on the principle that deformation alters both the physical properties as well as the dynamic characteristics of track slab [16]. This method is not limited by the working time, and it does not affect the train operation, so it can be considered a real-time and global non-destructive monitoring technique [17].
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