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基于小波变换分析箱梁振动噪声的时频特性

张迅 赵宇 阮灵辉 刘蕊 李小珍

张迅, 赵宇, 阮灵辉, 刘蕊, 李小珍. 基于小波变换分析箱梁振动噪声的时频特性[J]. 西南交通大学学报, 2020, 55(1): 109-117. doi: 10.3969/j.issn.0258-2724.20170768
引用本文: 张迅, 赵宇, 阮灵辉, 刘蕊, 李小珍. 基于小波变换分析箱梁振动噪声的时频特性[J]. 西南交通大学学报, 2020, 55(1): 109-117. doi: 10.3969/j.issn.0258-2724.20170768
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

基于小波变换分析箱梁振动噪声的时频特性

doi: 10.3969/j.issn.0258-2724.20170768
基金项目: 国家自然科学基金(51778534,51978580)
详细信息
    作者简介:

    张迅(1985—),男,副教授,博士,研究方向为铁路桥梁减振降噪,E-mail:zhxunxun@swjtu.edu.cn

  • 中图分类号: U24; TB53

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

  • 摘要: 为探讨列车激励引起箱梁振动噪声的时频特性,以32 m混凝土简支箱梁为例,现场实测箱梁各板件的振动和近场噪声,并采用小波变换结合MLP (modified Littlewood-Paley)小波基的方法进行信号处理. 引入小波脊线和小波能量比两个指标对信号的时频特性进行定量分析,在此基础上,探讨了行车速度和行车方向的影响规律. 研究结果表明:相比Morlet小波和Mexihat小波,MLP小波更清晰地刻画箱梁振动噪声在时-频两域的局部集中特性;箱梁噪声比振动的频变程度要小,且前者的小波能量在频域上更为集中;翼板振动和腹板振动的频变特性分别对行车速度和行车方向敏感;45~60 Hz范围是箱梁噪声控制的关键频率范围.

     

  • 图 1  跨中横断面测点布置(单位:m)

    Figure 1.  Layout of measuring points at mid-span (unit: m)

    图 2  不同小波基处理得到的时频分布

    Figure 2.  Time-frequency distribution obtained by different wavelet basis functions

    图 3  振动加速度的时频分布

    Figure 3.  Time-frequency distribution of vibration accelerations

    图 4  声压的时频分布图

    Figure 4.  Time-frequency distribution of sound pressures

    图 5  振动加速度和声压的小波脊线

    Figure 5.  Wavelet ridge curves of acceleration and sound pressure

    图 6  振动加速度和声压的小波能量比

    Figure 6.  Wavelet energy ratios of acceleration and sound pressure

    图 7  行车速度对小波脊线的影响

    Figure 7.  Influence of train speed on wavelet ridge curves

    图 8  近轨120 km/h下翼板振动的时频分布

    Figure 8.  Time-frequency distribution of flange vibration at near-track side at train speed of 120 km/h

    图 9  行车速度对小波能量比的影响

    Figure 9.  Influence of train speed on wavelet energy ratios

    图 10  行车方向对小波脊线的影响

    Figure 10.  Influence of train driving direction on wavelet ridge curves

    图 11  行车方向对小波能量比的影响

    Figure 11.  Influence of train driving direction on wavelet energy ratios

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出版历程
  • 收稿日期:  2017-12-01
  • 修回日期:  2018-02-24
  • 网络出版日期:  2018-09-14
  • 刊出日期:  2020-02-01

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