Dynamic Responses of a Metro Train-Bridge System under Train-Braking: Field Measurements and Data Analysis

• Published in: Sensors (Basel, Switzerland) Vol. 20; no. 3; p. 735
• Main Authors: He, Xuhui, Yu, Kehui, Cai, Chenzhi, Zou, Yunfeng, Zhu, Xiaojie
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 29.01.2020; MDPI
• Subjects: acceleration; Accelerometers; choi-williams distribution; Continuous bridges; elevated metro line; Experiments; Fourier transforms; High speed rail; Signal processing; train-bridge system; Undercarriages; Vibration measurement; wavelet coherence; Wavelet transforms; China; Choi-Williams distribution; acceleration; train-bridge system; wavelet coherence; elevated metro line
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s20030735

This paper focuses on the dynamic responses of a metro train-bridge system under train-braking. Experiments were performed on the elevated Metro Line 21 of Guangzhou (China). A continuous, three-span, rigid-frame bridge (42 m + 65 m + 42 m) and a standard B-type metro train were selected. The acceleration signals were measured at the center-points of the main span and one side-span, and the acceleration signals of the car body and the bogie frame were measured simultaneously. The train-bridge system's vibration characteristics and any correlations with time and frequency were investigated. The Choi-Williams distribution method and wavelet coherence were introduced to analyze the obtained acceleration signals of the metro train-bridge system. The results showed that the Choi-Williams distribution provided a more explicit understanding of the time-frequency domain. The correlations between different parts of the bridge and the train-bridge system under braking conditions were revealed. The present study provides a series of measured dynamic responses of the metro train-bridge system under train-braking, which could be used as a reference in further investigations.