为研究地铁列车在双层车辆段运行引起的上盖建筑振动及室内结构噪声特性，以国内某双层车辆段上盖物业工程为研究对象，采用现场实测和数值模拟相结合的方法，系统分析了双层车辆段上盖建筑振动与辐射二次结构噪声传递规律。基于大地-车辆段-上盖建筑有限元模型，分析了列车荷载作用下，运用库上盖建筑的振动传递特性，再利用声传递向量法分析了上盖建筑室内结构辐射噪声及其特性，最后对室内各板件的噪声辐射贡献度及吸声平板降噪效果进行了研究。分析结果表明：由于高频振动经过土体衰减迅速，在80 Hz以上频段，二层行车引起的上盖建筑底层振动显著大于一层行车；运用库车致上盖建筑振动在第10层衰减至最低水平，随着楼层的继续增加，振动出现放大现象；在40 Hz处天花板和地板对卧室场点声学贡献度最大，其中在顶层采用吸声材料后的降噪效果最为明显。
Abstract
In order to study the vibration and indoor structural noise characteristics of the over-track building caused by the operation of metro in the double-deck depot, taking the over-track building property project of the first double-deck depot in China as the research object, the propagation law of vibration and radiated secondary structural noise of the over-track building in the double-deck depot is systematically analyzed by using the method of field measurement and numerical simulation. Based on the finite element model of earth-depot-over-track building, the vibration propagation characteristics of the over-track building under train load are calculated, and then the radiated noise and its characteristics of the indoor structure of the over-track building are analyzed by using the acoustic transfer vector method. Finally, the noise radiation contribution of indoor panels and the noise reduction effect of sound-absorbing plates are studied. The analysis results show that because the high-frequency vibration attenuates rapidly through the soil, at the frequency band above 80Hz, the ground floor vibration of over-track building caused by train operation on the second floor is significantly greater than that on the first floor; The vibration of the over-track building caused by the vibration caused by the train in the operation depot is attenuated to the lowest level on the 10th floor, and then the vibration is amplified with the continuous increase of the floor; At 40 Hz, the ceiling and floor contribute the most to the acoustics of the bedroom site, and the noise reduction effect is the most obvious when the sound-absorbing material is used on the top floor.
关键词
双层车辆段 /
振动传递规律 /
二次结构噪声 /
声学贡献量分析 /
吸声系数
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Key words
double-deck depot /
propagation law /
secondary structure noise /
acoustic contribution analysis /
sound absorption coefficient
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