地铁列车振动源强离散机理测试分析
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TB533+.2; X827

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(国家自然科学基金资助项目(51978043);北京市自然科学基金资助项目(3184047);中央高校基本科研业务费专项基金资助项目(2019YJS115)


Analysis Mechanism of Vibration Source Dispersion Induced by Metro Trains Through In-situ Test
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    摘要:

    为了分析地铁列车振动源强离散特征以及不同频段的控制因素,对某地铁线路的同一区间内2个断面进行现场原位测试。从时域、频域多角度出发,统计分析全天测试样本。结果表明:测试断面振动源强离散超过15 dB,且呈现与列车编组相关的周期性;早、晚高峰时段振动源强并没有显著增大;同一列车多次通过固定测试断面引起的振动响应差异主要受6.3 Hz以下频段的离散性影响,该频段主要源于列车的准静态激励,与列车的载重直接相关;不同列车间8~250 Hz频段内的振动响应由车轮不圆顺状态的差异性控制,该频段内分频振动加速度级差异最大接近20 dB,直接导致全天内实测振动源强样本的显著离散。

    Abstract:

    In order to analyze the discrete characteristics of the vibration source of subway trains and the dominating factors in different frequency bands, two sections in the same part of a subway line are tested in situ. The whole-day test samples are statistically analyzed from time domain and frequency domain. The results show that the vibration source intensity of the test section has a dispersion of more than 15dB, and presents periodicity related to train formation: the vibration source intensity does not increase significantly during the morning and evening peak hours; the vibration response difference caused by the same train passing through the fixed test section multiple times, mainly affected by the discreteness of the frequency band below 6.3 Hz; this frequency band is mainly derived from the quasi-static excitation of the train, and is directly related to the load of the train: the vibration response in the 8~250 Hz frequency band between different trains is dominated by the difference of the wheel out-of-roundness state; the maximum difference of the frequency division vibration acceleration level in this frequency band is close to 20dB, which directly leads to the significant dispersion of the measured vibration source intensity samples throughout the day.

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  • 在线发布日期: 2020-08-27
  • 出版日期: 2020-08-30
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