乾式二重床の実建物における重量床衝撃音レベル低減量の推定方法

摘要

To provide an estimation method of the weight impact-sound-level-of-floor reduction amount in the real building of a dry type double floor.SOLUTION: An impedance descending quantity ΔLis calculated from the average impedance level of a slab surface measured in a JIS laboratory; the weight impact-sound-level-of-floor reduction amount ΔLat every exciting point n of independent 63 Hz is calculated from the weight impact sound level of floor of the above-mentioned slab and the weight impact sound level of floor in the state where the double floor is installed; a and b in the linear expression (ΔL=a×ΔL+b) are calculated from the value obtained ΔLand ΔL; and the impedance descending quantity ΔLat every exciting point n is calculated from the average impedance level of the slab surface, and the predicted value ΔLof the weight impact-sound-level-of-floor reduction amount is obtained from this and the above-mentioned linear expressions.SELECTED DRAWING: Figure 1