高架道路声屏障的降噪效果

详细介绍了德国RLS 90道路交通噪声预测模型,运用RLS 90模型对具有典型道路参数的高架道路试验段在不同距离、不同高度下进行了辐射噪声和声屏障降噪效果特性的预测计算,并进行了实际测量.结果表明,高架道路对低于其路面高度的近距离区域有显著的噪声遮蔽作用,对于高架道路,声屏障对路面高度附近的区域降噪效果最佳,4 m高声屏障的最大降噪效果达10 dB.结果还表明,采用RLS 90模型得到的高架道路噪声级和声屏障降噪效果计算值和实测数据吻合良好.

Noise reduction effect of sound barrier of elevated road

Based on RLS 90 model, noise and barrier effect of test elevated road section at different distance and different height were calculated and compared with measurement result. For near area lower than its height, elevated road shields noise remarkably. As to elevated road, noise barrier can get best noise reduction near the height of road surface. 10 dB noise reduction can be expected for 4 m high barrier. Comparisons of calculation and on-site measurement results of barrier performance of test elevated section show that results obtained from RLS 90 model are in concord with measurement results.