基于FE-SEA法的上盖建筑宽频段振动与噪声分析与控制
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作者单位:

1.华东交通大学 土木建筑学院;2.华东交通大学 轨道交通基础设施性能监测与保障国家重点实验室;3.华东交通大学 轨道交通基础设施性能监测与保障国家重点实验室

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中图分类号:

TB533;U231

基金项目:

国家杰出青年科学基金(52225210)


Analysis and control of wide-band vibration and noise of roof building based on FE-SEA method
Author:
Affiliation:

1.School of Civil Engineering and Architecture,East China Jiaotong University;2.State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University;3.State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure;4.East China Jiaotong University

Fund Project:

National Science Fund for Distinguished Young Scholars (No. 52225210)

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    摘要:

    为分析地铁车辆段运行对上盖建筑振动与室内二次结构噪声影响,基于FE-SEA混合法理论,以某地铁车辆段上盖建筑为依托,建立车辆-轨道-盖板-上盖建筑耦合模型,开展了地铁振动作用下不同频域范围内上盖建筑振动与室内二次结构噪声分析。揭示上盖建筑振动产生机理,探究上盖建筑振动与噪声传播规律。研究结果表明:采用FE-SEA混合法分析预测上盖建筑振动及室内结构噪声,具有较高的准确性;上盖建筑各楼板振动受固有频率影响,主频振动位于31.5~50Hz的低频段内;车致上盖建筑振动Z振级在第九层衰减至最低水平,随着楼层增加,振动出现放大现象;各典型房间二次结构噪声声压主要集中于20~80Hz范围内,不同典型房间的A声级随着楼层增加均出现先减小后增大的现象;施加隔振支座可以起到较好地减振效果,可以有效地降低结构自振频率,并降低上盖结构对高于这一频率的振动响应。研究结果可为地铁车辆段上盖建筑振动预测和减隔振工程措施提供有益参考。

    Abstract:

    Using the FE-SEA mixed method theory, this study establishes a coupling model of vehicle-track-cover-upper covered building to analyze the impact of subway car depot operation on vibration and indoor secondary structure noise in an upper covered building. The vibration and noise of the roof building and indoor secondary structure in different frequency domains are analyzed under the influence of subway vibrations. The mechanism underlying the generation of vibrations in overlying buildings is unveiled, while also delving into the propagation laws governing vibration and noise in such structures. Results show that the FE-SEA mixed method accurately predicts roof-building vibrations and indoor structural noise. Each floor"s vibration is affected by natural frequency, with main-frequency vibrations located in low-frequency bands between 31.5~50Hz. Vehicle-induced roof-building Z-vibration levels attenuate to their lowest point on the ninth floor before magnifying as floors increase; typical room secondary structure noise pressure mainly concentrates within 20~80Hz ranges, with A-levels decreasing then increasing as floors rise; application of vibration isolation support effectively reduces natural frequencies while reducing higher-frequency responses from roof structures above this range. These findings provide useful reference for predicting, reducing, or isolating subway-depot-related vibrations.

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历史
  • 收稿日期:2024-03-07
  • 最后修改日期:2024-05-15
  • 录用日期:2024-05-19
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