低频无规入射商场通过矩形板入射到闭空间的隔商量──Ⅱ．实验部分

Transmission loss of a rectangular panel into a rectangular enclosure in low frequency random incidence sound field ── Ⅱ. Experimental part

前文［３］从理论上计算了低频扩散声场通过一块矩形薄板入射到矩形闭空间的噪声衰减量，本文是实验部分。实验是在混响声场中做的。一个矩形薄铝板和长方体混凝土闭空间构成板／闭空间耦合系统，在混响室中对其在单频和一定带宽的白噪声激励下的声传入噪声衰减量进行了测量。并和前述理论的计算结果进行了比较。理论和实验结果相符合。

The noise reduction through a thin rectangular panel into a rectangular enclosure in a lowfrequency reverberant sound field has been investigated experimentally. The noise reduction in twodifferent reverberant sound fields excited respectively by pure tone and broad band white noise areobtained. They are used to verify, some previous theoretical predictions. There are reasonable agreement between experimental results and theoretical ones.