薄纤维层吸声理论和实验研究
Journal Title: Science Paper Online - Year 2007, Vol 2, Issue 4
Abstract
薄纤维层如织物、无纺布等既是室内装饰材料，又具有较好的吸声作用。然而根据传统微孔吸声理论，薄纤维层由于微孔通道太短而只能有很小的吸声作用。但是，在背后有空腔时薄纤维层却表现出良好的吸声效果。说明薄纤维层可能具有某种新的吸声机理。作者首先将穿孔板共振吸声理论应用到薄纤维层当中。由此推导出的共振吸声频率与薄纤维层第一吸声极大值的对应频率基本吻合。然后又将微穿孔共振吸声理论引入。在将材料振动吸声因素考虑进去后，建立了薄纤维层吸声公式。比之传统理论，该公式与实验结果相吻合较好。同时这种理论较好地解释了薄纤维层在作为护面材料或紧贴墙壁时吸声系数等于或接近于零，而作为窗帘或背后有空腔时却具有较好的吸声效果的这一声学现象。
Authors and Affiliations
Xin-an Zhang
Keywords
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