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. An acoustically insulting measurement device was established for normal incidence. A 1 m2 opening was placed in front of the muffler case and the sample was placed in the opening. In front of the sample there were 25 speakers with the same phase mounted on a baffle plate. A single layer had been measured. Sound insulation with double plates. We have compared the experimental data of the sound insulation of vertical and random incidences. We found that the experimental results are consistent with the corresponding theoretical results. The general characteristics of sound insulation in a single porous layer are consistent with the theory of simplified conditions.