不同顶端结构声屏障绕射声衰减量模拟分析

摘要

In order to study the influence of different top structures of the sound barriers on the effect of sound diffraction attenuation, the attenuation formula in GB/T17247.2-1998 standard was used to analyze and calculate the diffraction attenuation of four kinds of common apex structures. The optimal configuration was selected according to the curve of diffraction attenuation change in 0-5 000 Hz frequency range. The results show that the Y-type and T-type structure’ s diffraction attenuations are the largest and nearly the same. Then, using the acoustic software Virtual Lab, the sound insulation simulation was done for the Y-type and T-type structures. And their noise-reduction effects were determined according to the distribution of sound pressure level in the acoustic shadow. The results show that the sound pressure level’s reduction area of the Y-type structure is wider than that of the T-type. Then, the insertion losses of the two structures were calculated. The results show that the noise reduction effect of the Y-type structure is better than that of the T-type.%针对不同顶端结构的声屏障对绕射声衰减量的影响，对四种常见的顶端结构利用国标GB/T17247.2-1998中规定的绕射声衰减量公式进行计算分析，根据0-5000 Hz频域段内四种结构的绕射量变化曲线选择出最佳构型，结果表明Y形和T形结构绕射声衰减量最多，且几乎相等；然后通过声学软件Virtual Lab对Y形和T形结构进行隔声效果仿真分析，根据声影区内声压级分布情况判断降噪效果，结果显示Y形结构的声压级较T形降低覆盖面积更广，并计算这两种结构的插入损失，结果显示Y形结构较T形障板的降噪效果更好。