高架道路渐变空腔微穿孔声屏障的设计和降噪

Design and noise reduction of elevated road barrier of micro-perforated panels with linear-change cavity

针对道路交通噪声的频谱特性,提出了一种采用渐变空腔的微穿孔声屏障,根据微穿孔吸声理论推导了渐变空腔微穿孔声屏障吸声性能的计算方法,并对其吸声性能进行预测计算和实验室测量。采用RLS90预测模型计算渐变空腔微穿孔声屏障的降噪效果,并对高架道路试验工程段进行了声屏障降噪效果的现场测量。结果表明,渐变空腔微穿孔声屏障在道路噪声的主要频谱范围内具有良好的吸声性能,吸声频带为2个倍频程,峰值可达0.7;高架道路声屏障降噪效果的计算值和实测值吻合良好,声屏障和防撞墙总高度为4m,对6层以下高度的建筑物有良好的降噪效果,最大降噪效果达10.3dB。

A new type of elevated road noise barrier employing micro-perforated panels with liner-change cavity was installed and evaluated. Noise reduction evaluation of noise barrier of test elevated road according to RLS 90 model was compared with measurement results on site. Results showed that the new barrier had good acoustic absorption in main road noise frequency range with 2 absorption bandwidth and maximum absorption coefficient of 0.7. Installing the noise barrier of 4 m high in an elevated road may reduce the noise level by up to 10.3 dB.