摘要
根据刚性骨架多孔材料的微观理论具体分析了孔隙率、流阻率、扭曲因子和初形因子对低噪声沥青路面声学特性的影响.同时，讨论了路面厚度、双层路面结构的影响;也估算了低噪声沥青路面对轮船与路面相互作用所产生的单极子声源的影响.分析表明，当厚度大于40mm时，孔隙率是决定路面声学特性的主要因素;双层路面的声学特性基本上由面层结构决定.低噪声沥青路面对单机子声源的降噪作用在3dB左右.
According to the microstructural theory of rigid-frame porous materials, the acoustical characteristics of low noise asphalt pavement is analysed in terms of four parameters-porosity, flow resistivity, tortuosity and pore shape parameter. The effects of pavoment thickness and two- layered structure, and the reduction of tyre/road noise are disccused too. Some results are obtained: the effect of porosity is the most important factor, and the acoustical characteristics of two-layered structure pavement is detcrmined only by the upper layer structure,when the pavement thickness is more than 40mm. The reduction of tyre/road monopole noise is about 3dB contributed by the low noise asphalt pavement
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1997年第4期405-409,共5页
Journal of Tongji University:Natural Science
