柔性薄片和多孔材料声透射系数的声管测量

Measurement of Flexible Slim Sample and Porous Sample's Complex Transmission Coefficent in Wave Tube

采用驻波管四传感器法可以测量小样品、薄型样品的垂直入射复透射系数。采用两类样品测试:一类是柔性高分子薄片,通过对薄片振动的有限元分析验证测试的正确性;一类是多孔吸声材料,发现它的隔声量并不遵从质量作用定律。最后给出了测试随机误差,证实此方法切实可行。

A small slim sample's complex normal-incidence transmission coefficient can be measured by four-microphone method in standing wave tube.Two kinds of sample had been measured,For the flexible slim macromolecule sample,FEM had been used to validate the measurement results.For the porous absorbent sample,we found its sound transmission loss don't accord to mass-controlled law.At last,by analysis of measurement random error,this method had been tested applicable.