Abstract: The acoustic performances of Yshaped, multiwedgeshaped, and Tshaped structures of noise barrier are simulated by using acoustic softwareRAYNOISE. In the region of 30m height and 50m width behind the sound barrier, the simulation result of noise reduction effect is obtained. The result indicates that the multiwedgeshaped structure is the best for noise reduction. Its insertion loss can reach 14.5dB in the region of 2m height and 50m width behind the noise barrier. The noise barrier of the Tshaped structure has good acoustic performance in the region of lower height behind the noise barrier. The insertion loss of the Yshaped structure decreases slightly when the height of the measurement point increases. The influence of sound absorption material on noise reduction is studied. The result indicates that the distribution of sound absorptionmaterial has no influence on the noise reduction effect in the region just behind the barrier. The possible reason is that the reflection between the barrier and the vehicle is not considered in the simulation.

Key words: acoustics, structure of noise barrier, simulation, Yshaped structure, multiwedgeshaped, Tshaped ructure

摘要：

利用声学仿真软件RAYNOISE对Y形分叉形、多重楔形、T形弧形结构的声屏障在屏障后高度为30m，距离为50m范围内进行降噪效果的仿真模拟。结果显示，与直立形声屏障相比，多重楔形声屏障具有较好的降噪性能，在距离声屏障50m，高度2m时插入损失达到14.5dB。T形弧形顶声屏障在高度较低区域具有较好的降噪性能。Y形分叉形声屏障的插入损失随着声屏障后敏感点高度的增加，下降较少。研究吸声材料对声屏障降噪性能的影响，在能够实现的吸声材料的吸声系数的条件下，吸声材料的布置对声屏障后声影区的降噪效果没有影响，原因可能是没有考虑声波在屏障和车体之间多次反射的影响。

关键词: 声学, 声屏障结构, 模拟, Y形分叉形, 多重楔形, T形弧形顶