Abstract: The sound barrier design has become a major theme concerned by international academic circles. Setting sound barriers on both sides of railroad track is an effective and economic method for railway’s noise control. The diffraction attenuation calculation is the kernel content of the sound barrier design, and the equivalent frequency of the sound barrier is one of the important parameters for the diffraction attenuation calculation. In order to raise the efficiency of sound barrier design, the noise frequency characteristics of freight trains in different locomotive traction and at different operating speed are studied by testing. Meanwhile, the sound barrier equivalent frequencies of freight trains under different working conditions are obtained by statistical analysis of the measured field data.

Key words: acoustics, sound barrier, attenuation caculation, frequency characteristic, equivalent frequency

摘要： 声屏障设计研究一直是国内外广泛关注的课题，在线路两侧正确地设置声屏障不仅提高噪声控制的主动性，也将降低项目的投资。然而，绕射衰减计算是声屏障设计的重要步骤，声屏障的等效频率又是声屏障绕射衰减计算的重要参数之一。为准确、快捷的进行声屏障设计，需针对不同机车牵引类型，不同时速下货物列车的噪声频率特性进行试验研究，通过对实测数据进行统计分析，由此可得到不同工况下货物列车的声屏障等效频率。

关键词: 声学, 声屏障, 衰减计算, 频率特性, 等效频率