关键词: 声学, 声屏障, 顶端结构, 绕射量, 仿真分析, 插入损失

Abstract:

According to the sound barrier’s different top structures on the effect of diffracted attenuation, using the attenuation formula in GB/T17247.2-1998 to analyze and calculate four kinds of common apex structures’ diffracted attenuation, Selecting an optimal configuration according to diffracted attenuation change curve of the 0-5000Hz frequency-domain segment, the results showed that the Y-type and T-type structure’s diffracted attenuation is the most and nearly equal; Then using acoustic software virtual lab to do sound insulation simulation on Y-type and T-type structure, determined the noise-reduction effect according to the distribution of sound pressure level in the acoustic shadow, The result showed that the sound pressure level’s reduce area of Y-type structure is wider than T-type, And then calculated the insertion loss of the two structures. The results showed that the noise reduction effect of the Y-type structure is better than that of the T-type.