The effect of pavement porosity on tire tread block noise generation

摘要

Tire noise has long been recognized to be a major contributor to traffic noise. Although any type of tire carcass vibration can generate noise, this paper will only discuss the mechanism of a tread block impacting a highway surface. To isolate the pressure signature generated by a single tread block, a tread block impact device has been developed. The acoustic pulses produced can be associated with the changing volume velocity of the air displaced as the tread block approaches the surface. By testing impact surfaces with known porosity and frequency characteristics, experimental relationships between the shape of the acoustic pressure signature, and noise attenuation can be determined. By evaluating the frequencies generated by tread block impacts, tuned pavements which attenuate the most irritating frequencies could be developed.