拡散度法による重量床衝撃音の予測計算 : 板振動の拡散度評価指数の構成とその利用に関する研究 その4

抄録

Point impedance of a finite plate makes up with two factors, namely a resonance of the plate vibration and a restraining effect by plate ends. In previous papers of the works, it is revealed that the point impedance can be easily evaluated by the diffuse index of plate vibration. In the present paper, a calculation method of the heavy-weight floor impact sound level based on the diffuse index is shown and the accuracy of this method is confirmed via comparisons with measured values. In addition, this method includes the evaluation of the difference in vibrational velocity levels between the value at the excitation point and mean value on the slab, and sound radiation coefficient for the corresponding room area. These values are calculated based on the diffuse index, too. This method applies to the floor slabs of various conditions (the large span slabs and the ordinary slabs) without any restrictions and can be simply calculated. Thus, this method newly developed in this work is very useful for the evaluation of floor impact sound.