Adding a back lining at one side of the porous metal material is an effective and workable way to improve its sound absorption properties.
而在多孔金属材料一侧添加背衬是一种提高吸声性能的有效可行的方法。
2
The product made of synthetic fiber such as nonwoven web, fabric and carpet as a good porousmaterial will be used in buildings as both ornament and sound absorption material.