330 インパルス音を用いた吸音率測定装置

概要

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The development of an in-situ instrumentation system to measure the sound absorption coefficient of the road surface is strongly demanded for the purpose of the maintenance of the drainage pavements. This paper describes the structure and the performance of the developed system. In the system, a loudspeaker radiates and impulsive sound and a microphone picks up the incident sound and the reflected sound. As the height of the system has big influence on the performance, the effects of the height are mainly investigated. According to the results, the microphone height should be higher than 50cm. If the height is lower, there can be a considerable error due to the slight change in the microphone height.
社団法人日本機械学会の論文
2000-09-01