Noise measuring technique and field evaluation based on the effects of vehicles and pavement types

A measuring technique for tire-pavement interaction noise (coast-by noise) that uses a proposed close proximity (CPX) method equipped with surface microphones has been employed to perform pavement noise evaluations on nine different pavement sections as well as two on-site highways. Through field tests, the appropriate noise measuring procedures have been developed and validated for evaluating light and heavy vehicles and various pavement surfaces at varying vehicle speeds. The results show that tire-pavement noise levels vary widely according to the various surface types, vehicle types, and vehicle speeds. In addition, it was found that power-by noise (power-train plus tire-pavement interaction noise) measurements, based on the proposed CPX method, were able to determine the sound power levels used for outdoor sound propagation models.