Modeling of Sound Absorption Propertes of Porous Asphalt Pavement Based on Electro--Acoustic Theory

Abstract

A meso-geometric model of pore network was established to predict the sound absorption performance of porous asphalt mixture.Based on characteristics of the pore structure of porous asphalt mixture, the meso-structure model of porous asphalt mixture was established by using physical geometry principle.For the meso-void structure, the electro-acoustical equivalent circuit was established based on electro--acoustic theory, and the relationship between the sound absorption coefficient and the total impedance was established.The model was verified by image processing technology and standing wave ratio method.DIP image processing technology was used to determine these void structure parameters of porous asphalt mixture specimens, and standing wave tube method was used to test the sound absorption coefficient of specimens.The data predicted by the model was compared with the measured data.The results show that the model of meso-void structure and the model of sound absorption coefficient of porous asphalt mixture based on electro--acoustic theory are feasible and effective.