| 요약2 |
The sound absorption performance of the low-frequency band of the Bass trap was measured, prior to applying the Bass trap to heavy-weight impact sound reduction. The measurement took place in the reverberation room and four bass traps were used. There were two cases of installation when mounting on the floor and at the corner. When mounting on the floor, the NRC value is 1.20, and mounting at the corner, it shows 1.35. Especially, when mounting at the corner, the sound absorption coefficient was 0.09 ~ 0.31 higher at 50Hz ~ 250Hz which is the low-frequency band, and there was no difference in the high-frequency band above 1.25 kHz. In addition, It is shown that the sound absorption coefficient of 0.4 ~ 1.06 in the 63Hz ~ 125Hz band, which is the frequency band for determining the heavy-weight impact sound value, and it is necessary to further study how such low-frequency sound absorption performance can reduce the heavy-weight impact sound. |