垂直与无规入射隔声的研究

建立了垂直入射的隔声测量装置.消声箱前面有一个1平方米的开口,样品放在开口处.在样品前面有25个同位相的扬声器装在一个障板上.已经测量了单层与双层板的隔声.我们比较了垂直与无规入射的隔声量的实验数据.发现实验结果与相应的理论结果一致.单一多孔层的隔声的一般特性与简化条件的理论一致.

A STUDY OF SOUND INSULATION BY NORMAL AND RANDOM INCIDENCE

Facilities to measure sound insulation by normal incidence have been built. On the front side of the anechoic box where is a square opening of 1m², in which the sample is placed. In front of the sample there are 25 loudspeakers in phase, on one baffle. Sound insulation measurements have been made on single and double panels. comparison of experimental data of transmission loss is also made for both normal and random incidence. Experimental results are found in good agreement with corresponding theoretical results. The general behaviour of sound insulation of a single porous layer is shown in accordance with the theory for simplified conditions.