Zhang Jianxiang, Huang Wenzhu, Zhang Wentao, Li Fang, Du Yanliang
State Key Laboratory of Transducer Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
Sensors (Basel). 2021 Jan 25;21(3):787. doi: 10.3390/s21030787.
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.
列车引起的振动响应为实际运行中的高速铁路轨道板变形实时监测提供了一种灵活的解决方案。本文提出了一种基于小波包能量（WPE）的轨道板变形长期实时监测方法，该方法利用光纤加速度计记录列车引起的振动。我们发现，通过使用覆盖相邻车厢引起的一阶和二阶频率的频带的WPE，可以建立轨道板变形的振动响应规律。在京沪高速铁路上进行了为期一年多的现场试验，以研究在长期温度荷载作用下持续变形的轨道板的列车引起的振动响应规律。WPE特征指标的最大值出现在冬季和夏季，并且它们与日温度荷载下空气环境与轨道板之间的温差呈正相关。这些结果被证明与长期和日温度荷载下的轨道板变形规律一致。基于光纤加速度计和WPE的新方法为轨道板变形的长期实时监测提供了一种新方法。
