ABSTRACT

The sound absorption coefficient was evaluated for the acoustic performance of the pavement in many studies, which is an evaluation index generated by the non-contact interaction between the tyre and pavement. The impedance tube is not enough to simulate the noise of tyre/pavement interaction. This paper presents the findings of a lab and field evaluation of noise characteristics of porous asphalt pavement on the use of the tyre-rolling-down (TRD) and impedance tube methods as well as OBSI method. The effect of different factors (pavement type, pavement thickness, void ratio, maximum nominal particle size) on the pavement noise were investigated by TRD. It is well synchronised with the impedance tube test and a comprehensive pavement noise evaluation method is formed in lab. Combined with the Grey correlation analysis methods, influence degree of four parameters were analysed and then the correlation between noise level and sound absorption coefficient is tried to establish. Then, the effects of lane distribution and aging, abrasion of road on noise were also investigated at two test sections of in service highway. The lab results demonstrated that A-weighted SPL and maximum absorption coefficient showed better negative correlation under different porosity conditions compared to average absorption coefficient.

摘要

吸声系数是许多研究对路面声学性能进行评价的指标，是轮胎与路面非接触相互作用产生的评价指标。阻抗管不足以模拟轮胎/路面相互作用的噪声。本文介绍了使用轮胎滚动 (TRD) 和阻抗管方法以及 OBSI 方法对多孔沥青路面的噪声特性进行实验室和现场评估的结果。通过TRD研究了不同因素（路面类型、路面厚度、空隙率、最大公称粒径）对路面噪声的影响。与阻抗管试验同步性好，在实验室形成了综合的路面噪声评价方法。结合灰色相关分析方法，分析了四个参数的影响程度，试图建立噪声级与吸声系数的相关性。然后，在营运公路的两个试验路段，研究了车道分布和老化、道路磨损对噪声的影响。实验室结果表明，与平均吸收系数相比，A加权声压级和最大吸收系数在不同孔隙率条件下表现出更好的负相关性。