Estimation Method of Noise Reducing Devices Installed on the Noise Barrier(I) - Estimation by Sound Intensity -

방음벽 상단소음저감장치의 성능평가 방법에 관한 연구(I) - 음향인텐시티에 의한 평가 -

The acoustical performance of noise reducing devices installed on the top of a noise barrier were tested by small-scale outdoor tests. Noise measurements before and after installation of the devices were carried out using sound intensity methods. It is well known that the sound intensity method can specify the strength and directivity of sound, and it is convenient to consider the feature of sound around a noise barrier. The noise reduction effect of each edge device was evaluated using the difference between the input and output sound power levels calculated from sound intensities. It was investigated that each device had different efficiency in the shadow zone, while there was no significant difference between edge devices in the illuminated zone.