earticle

영어

The functional soundproof wall is composed of a sound absorption panel with a filter function and flat panel for the top, a zigzag-shaped soundproof panel whose effects were verified through simulation, and a flat panel for the bottom. The functional soundproof wall is 2 m wide and 2 m high, and it will be installed upright up to 1.5 m, forming the bottom, and will then be tilted by 30º from 1.5 m, forming the top. Noise will be generated at the distance of 2 m, 3 m and 4 m from the functional soundproof wall, and the measured noise will be classified into reflected sound and diffracted sound. The reflected sound will be measured for each height from 1 m, 2 m, 3 m and 4 m at the distance of 6 m, while noise measured in front of the soundproof wall will also be collected. The experiment result showed that there was a noise reduction effect by approximately 4 dB according to the composition. In terms of composition, the soundproof wall composing of the sound absorption panel and the shaped soundproof panel showed excellent reflected sound reduction effects, while the soundproof wall consisting of the filter showed overall excellent noise reduction effects. On the other hand, reflected noise and diffracted sound reduction effects of the shaped soundproof wall were shown clearer as the distance from the noise source was longer, especially at the distance of 4 m. The composed soundproof wall was effective for reducing reflected noise and diffracted sound. More importantly, the composition of the sound absorption panel and the shaped soundproof panel showed excellent reflected noise reduction effects, while in the case of composing with only the shaped soundproof panel, the reflected noise reduction effects began to be shown from 4 m from the noise source. Therefore, it is expected that the relevant soundproof measures can be used in the field effectively.