非织造布的结构特征与其吸声性能研究

Study on texture character and acoustic absorbent behavior of nonwovens

测试了不同非织造布的透气性能和吸声性能,并对几种吸声理论进行了对比分析。测试数据说明:非织造布的透气性不只是简单地与孔隙率成正比,还与其他一些复杂的不易测量的参数有关;非织造布在测试频段的吸声曲线随背面空气层的增厚而向低频域移动;材料的孔洞特征,特别是平均孔径是影响共振吸收峰频率的主要参数。

The permeability and acoustical properties of several nonwovens were measured,and then various theories of sound absorption were compared. The results showed that the permeability of nonwovens is not just linear to porosity,but also related with other factors. Increasing air gap behind nonwovens moves the absorption curve towards lower frequency. Pore characteristic especially mean pore size is proved to be the most effective factor that influences absorption peak frequency.