Methods Use a standing wave tube to measure the sound absorption coefficient of many kinds of grain.
采用驻波管法测量了多种粮食的吸声系数。
This article research content and research results mainly includes following parts: Phononic crystals new sound insulating material standing wave tube test modelling.
本文主要研究内容及成果如下：声子晶体新型隔声材料驻波管测试建模。
In standing wave method, the sound is not perfect standing wave, so the swing is not zero at wave knot.
驻波法中形成的声场不是理想驻波场，且波节处振幅不为零。
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