漏声对于高架结构声屏障降噪效果的影响

The influence of leakage noise on the noise drops efficiency of elevated structure noise barrier

声屏障是阻挡高架交通线路噪声传播的有效技术手段,而由声屏障与人行道存在的缝隙造成的漏声导致其降噪效果下降.通过建立缩尺比例模型研究了既有铁路高架结构的漏声,确定其对声屏障降噪效果的影响.结果表明,随着缝宽由小变大,声屏障隔声量的下降幅度先变大后变小.

Noise barrier was an effective technical means to prevent noise from spreading; but at home and abroad, the efficiency of noise drop of existing railway lines descended greatly, in which the leakage noise was the reasons created mainly from the seam existed in the sound barrier and sidewalk. The leakage noise of elevated mail structure of existing railway lines was studied through setting up reduced proportion model and confirmed its influence on the efficiency of noise drop of the barrier. The drop scope of sound insulation amount of noise barrier changed from large to small along with the seam changed from small to large.