METHOD AND APPARATUS FOR TESTING NOISE REDUCTION PERFORMANCE OF DRAINAGE PAVEMENT

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for testing a noise reduction performance of a drainage pavement which tests the noise reduction performance without use of an expensive measuring vehicle in a high S/N ratio in real time.;SOLUTION: The apparatus is provided with an acoustic box 10 having an opening on only a bottom face facing a road surface 1 and a bottom outer periphery held parallel to the road surface, and an elevator 20 for vertically elevating the acoustic box as the bottom face of the acoustic box is horizontally held. The acoustic box 10 has a radiating part 12 for radiating an acoustic wave 2 to the road surface, a reflecting part 14 for reflecting a reflected acoustic wave 3 reflected by the road surface to the road surface again, and a sound collecting part 16 for collecting the reflected acoustic wave reflected by the road surface several times.;COPYRIGHT: (C)2005,JPO&NCIPI