Measurements of basic acoustical properties of the porous pavement and their applications to the estimation of road traffic noise reduction
Measurements of basic acoustical properties of the porous pavement and their applications to the estimation of road traffic noise reduction
复制标题
多孔路面基本声学特性的测量及其在道路交通噪声降低估算中的应用
DOI：
10.1250/ast.20.63
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
R. Kawabata
中科院分区：
文献类型：
--
作者：
T. Iwase;R. Kawabata
本文介绍了透水性路面的声传播常数、声特性阻抗和声阻抗等基本声学特性的测试方法。作为应用，还介绍了它们对道路交通噪声的降噪效果的评价。在多孔沥青中，传播衰减小于玻璃棉或岩棉等典型纤维状多孔材料，传播速度仅为空气中的1/2-1/3。从声学特性阻抗的角度来看，对于低于约1.5kHz的频率，多孔沥青的声学硬度约为空气中的声学硬度的10倍，并且在低于1 kHz的频率处具有高吸收峰。利用这些实测特性可以评价多孔沥青的降噪效果。在这项研究中发现，多孔路面造成一些过度衰减的噪音。还发现，由于轮胎-道路相互作用噪声而导致的A加权噪声减少量约为2- 3dB。良好的透水性路面在短距离内的总降噪效果可能大于4dB。
This paper describes measurements of basic acoustical properties of porous pavement such as sound propagation constant, acoustic characteristic impedance and acoustic impedance. As their application, it also describes estimation of their effect on road traffic noise reduction. In porous asphalt, propagation attenuation is less than typical fibrous porous material of glass wool or rock wool, and propagation speed in it is 1/2-1/3 as slow as that in the air. From the point of acoustical characteristic impedance, porous asphalt is about ten times acoustically harder than that in the air for frequencies below about 1.5 kHz, and it has high absorption peak at a frequency below 1 kHz. Noise reduction effects of porous asphalt can be estimated by using these measured properties. It was found in this study that porous pavement causes some excess attenuation of noise. It was also found that amount of A-weighted noise reduction due to tire-road interaction noise is about 2-3 dB. Total noise reduction effect of well-constructed porous pavement is probably larger than 4 dB even at a short distance.