摘要
为了提高纤维多孔材料的低频吸声性能,并解决材料在高频段吸声性能的起伏问题,将2～3层不同孔隙性能的不锈钢纤维材料以不同的方式组合成梯度结构,研究了纤维多孔材料梯度结构的吸声性能。结果表明:梯度多孔吸声结构可有效改善低频吸声性能。不同孔隙度的排布方式对梯度结构的吸声性能有显著影响。按照孔隙度从高到低排布有利于吸声性能的提高。在此前提下,孔隙度越高、厚度越大,梯度结构的吸声性能越好。
In order to improve the sound absorption coefficient of fibrous porous materials at low frequency and decrease the fluctuation of material sound absorption coefficient at high frequency, the sound absorption coefficients of gradient porous materials with different pore structures were studied in present paper. Using stainless steel fiber as starting materials, the fiber porous material was prepared. The gradient structures were assembled in different ways, using two or three layer samples with different porous characteristics. The results show that the gradient structure greatly improves the sound absorption coefficient at low frequency. The arrangement of porosity has obvious influence upon the material sound absorption coefficient. In the precondition that the arrangement from high porosity to low porosity is beneficial to improve the sound absorption coefficient, the higher the porosity and the thicker the thickness, the better the sound absorbing characteristics of the gradient structure.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第12期2220-2223,共4页
Rare Metal Materials and Engineering
基金
国家"973"计划资助项目(2006CB601201B)
关键词
梯度结构
纤维多孔材料
吸声
不锈钢纤维
gradient structure
fibrous porous materials
sound absorption
stainless steel fiber
作者简介
汤慧萍,女，1966年生。博士，教授，西北有色金属研究院金属多孔材料国家重点实验室。陕西西安710016，E-mail：029-86231095，E-mail：hptang@c-nin．com
