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

被引：0
|
作者：
Zhang X. [1 ]
Zhao Y. [2 ]
Ruan L. [1 ]
Liu R. [1 ]
Li X. [1 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[2] Zhejiang Municipal Engineering Design Institute Co. Ltd., Shanghai Municipal Engineering Design Institute (Group) Co. Ltd., Hangzhou
来源：
Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University | 2020年 / 55卷 / 01期
关键词：
Box-girder; Noise; Time-frequency characteristic; Vibration; Wavelet transform;
D O I：
10.3969/j.issn.0258-2724.20170768
中图分类号：
学科分类号：
摘要：
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. © 2020, Editorial Department of Journal of Southwest Jiaotong University. All right reserved.
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页码：109 / 117
页数：8
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