• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 55 Issue 1
Jan.  2020
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Article Contents
ZHANG Xun, ZHAO Yu, RUAN Linghui, LIU Rui, LI Xiaozhen. Time-Frequency Characteristics of Box-Girder Vibration and Noise Based on Wavelet Transform[J]. Journal of Southwest Jiaotong University, 2020, 55(1): 109-117. doi: 10.3969/j.issn.0258-2724.20170768
Citation: ZHANG Xun, ZHAO Yu, RUAN Linghui, LIU Rui, LI Xiaozhen. Time-Frequency Characteristics of Box-Girder Vibration and Noise Based on Wavelet Transform[J]. Journal of Southwest Jiaotong University, 2020, 55(1): 109-117. doi: 10.3969/j.issn.0258-2724.20170768

Time-Frequency Characteristics of Box-Girder Vibration and Noise Based on Wavelet Transform

doi: 10.3969/j.issn.0258-2724.20170768
  • Received Date: 01 Dec 2017
  • Rev Recd Date: 24 Feb 2018
  • Available Online: 14 Sep 2018
  • Publish Date: 01 Feb 2020
  • In order to explore time-frequency characteristics of train-induced box-girder vibration and noise, a simply-supported concrete box-girder with a span of 32 m was selected as the case, the vibration and near-field noise of the box-girder slabs were measured, and the signals were processed by using wavelet transform with the modified Littlewood-Paley (MLP) wavelet basis. Two indexes of wavelet ridge curve and wavelet energy ratio were introduced to quantitatively analyze time-frequency characteristics. On this basis, how train speed and driving direction affect time-frequency characteristics were discussed. The results show that compared with the Morlet basis and the Mexihat basis, the MLP basis can better depict the localization of box-girder vibration and noise in both time and frequency domains. Box-girder noise has less variation in frequency than the vibration, and the former’s wavelet energy is more concentrated in frequency domain. The variation of flange vibration and web vibration in frequency domain are sensitive to train speed and driving direction, respectively. The frequency range of 45 to 60 Hz is vital for box-girder noise mitigation.

     

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