铝纤维复合板结构参数对吸声性能的影响规律

利用吸声材料降噪是治理变电站噪声污染的重要途径。以铝纤维、铝箔、铝板网为原料,采用冷轧法制备具有不同结构参数的铝纤维复合吸声板,采用阻抗管的标准测试方法检测铝纤维复合板吸声系数,研究材料的纤维板面密度、空腔厚度、纤维种类等参数对材料吸声性能的影响。结果表明:试验采用的铝纤维复合板具有优异的吸声性能,采用切削法纤维及面密度为484 g/m2的铝纤维复合板吸声性能最好;随空腔厚度的增大,吸声系数的峰值向低频段移动。

Effects of structure parameters of aluminum fibrous composite panel on sound-absorption properties

Using noise absorption materials is an important way to control noise in substations.The aluminum fibrous composite panel with different structure parameters,which is based on aluminum fibers,aluminum foil and aluminum net board,was successfully fabricated by using cold-rolled method,and its sound absorption coefficient was measured by standing wave ratio method.The effects of surface density,airspace thickness and fiber categories on the sound absorption coefficient were investigated.The results show that the aluminum fibrous composite panel with surface density of 484 g/m2,which is prepared by cutting fibers,has the best sound-absorption property.The airspace thickness shows a great influence on the sound absorption coefficient at low frequency,the sound absorption coefficient peak values shift to the low frequencies with the airspace get thicker.