基于声传递向量法的槽形梁结构低频噪声研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (19) : 132-138.

论文

刘林芽，秦佳良，雷晓燕，刘全民，宋瑞，曾峰

作者信息 +

Low frequency noise of a trough girder structure based on acoustic transfer vector method

LIU Linya, QIN Jialiang, LEI Xiaoyan, SONG Rui, LIU Quan, ZENG Feng

Author information +

文章历史 +

摘要

轨道交通槽形梁结构在列车动载作用下会辐射低频噪声，这种低频噪声对人体健康危害很大。以轨道交通30m的简支槽形梁为研究对象，基于车辆-轨道耦合动力学模型，利用有限元法计算了列车荷载作用下槽形梁的振动响应，再利用声传递向量法分析了槽形梁结构辐射噪声及其特性，最后对槽形梁结构各板件的噪声辐射贡献进行了研究。分析结果表明：轨道交通槽形梁底板的垂向振动速度振级和腹板的横向振动速度振级的峰值频率均为63Hz，且底板的垂向振动响应是最大的。槽形梁结构噪声的线性声压级的峰值频率在63Hz附近，且当频率为63Hz时，槽形梁结构噪声的辐射范围最广，衰减得最慢。槽形梁结构噪声辐射的主要区域在梁体的正上方和梁体的正下方，且梁体正上方的结构噪声要大于正下方。槽形梁底板对结构噪声的贡献量是最大的，其次是腹板，翼缘板对槽形梁结构噪声的影响很小。

Abstract

The low frequency noise radiated by trough girder structures in rail transit under dynamic load of trains is very harmful to human health.Taking a 30 m long rail transit trough girder simply supported as the study object, based on the vehicle-track coupled dynamic model, the vibration response of the trough girder under the action of train loads was calculated using the finite element method.Then, characteristics of the radiated noise of the trough girder structure were analyzed with the acoustic transfer vector method.Finally, contributions of the trough girder’s panels to radiated noise were studied.The results showed that both the peak frequency of the vertical vibration velocity level of the trough girder’s bottom deck and that of the transverse vibration velocity level of the trough girder’s web are 63 Hz, and the bottom deck’s vertical vibration response is the largest; the peak frequency of the linear sound pressure level of the trough girder structure-borne noise is near 63 Hz, its radiation region is the widest and its attenuation is the slowest at 63 Hz; the noise radiation main region is on the top and bottom of the girder, the noise on the top of the girder is larger than that on the bottom of the girder; the contribution of the girder bottom deck to noise is the largest, the second one is the girder web, and the influence of the girder flange slab on structure-borne noise is very small.

导出引用

刘林芽，秦佳良，雷晓燕，刘全民，宋瑞，曾峰. 基于声传递向量法的槽形梁结构低频噪声研究[J]. 振动与冲击, 2018, 37(19): 132-138

LIU Linya, QIN Jialiang, LEI Xiaoyan, SONG Rui, LIU Quan, ZENG Feng. Low frequency noise of a trough girder structure based on acoustic transfer vector method[J]. Journal of Vibration and Shock, 2018, 37(19): 132-138

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