摘要
以不同工艺制备的泡沫铝样品为代表,探讨了泡沫金属材料的吸声性能。根据泡沫金属材料样品吸声系数的实验数据,对其吸声数据与声波频率的关系进行了非线性拟合。拟合结果发现,利用高斯函数的形式获得了很好的拟合效果。拟合函数表征显示,泡沫金属的吸声系数与声波频率因素的平方呈exp指数关系,而且吸声系数曲线对于声波频率在低频端有一条水平渐近线。
Using foamed aluminum as the sample,the sound absorption property of porous foamed metals is investigated. With the experimental data of sound absorption,the relationship between the sound absorption coefficient and the sound wave frequency is nonlinearly fitted for these porous metallic samples. According to the fitting results,it is found that the expression of Gauss function can get a good fitting effect. The fitting function shows that the sound absorption coefficient of foamed metal is exponentially related to the square of the sound wave frequency factor,and the curve of sound absorption coefficient has a horizontal asymptote in the range of low frequency.
出处
《北京信息科技大学学报(自然科学版)》
2014年第4期1-5,共5页
Journal of Beijing Information Science and Technology University
基金
北京市凝聚态物理重点学科共建项目资助(XK100270454)
北京师范大学测试基金资助(C14)
关键词
多孔材料
泡沫金属
吸声性能
porous material
foamed metal
sound absorption property