驻波管中测量声学材料的隔声量

在驻波管中用双传声器法测量声学材料的隔声性能。通过测量不同背衬条件（即待测样品的后表面阻抗）下对应的前表面阻抗，可以求解与传递矩阵四个元素相关的中间变量，即可计算声学材料的隔声量。在驻波管中进行了单层多孔均匀材料、双层和三层复合非均匀材料的隔声性能测量，通过与四传声器法直接测量结果的对比，验证了采用双传声器法间接测量声学材料的隔声量是可行的。

Sound Transmission Loss Measurement by UsingTwo-microphone Method in a Standing-wave Pipe

The sound transmission performance of the acoustical material can be measured in the standing-wave pipe by using the two-microphone method. The front surface impedances of the acoustical material can be determined if the beck surface impedances are known, so the arguments which are associated with the four elements of the transfer matrix can be calculated, and the sound transmission loss of the acoustical can be easily obtained. Several samples have been tested in the standing-wave pipe, compared with the experimental results from the four-microphone method, we know that the two-microphone method can be used to measure the sound transmission loss.