西安交通大学机械工程学院,西安,710049
网络首发:2008-03-10,
纸质出版:2008
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张波, 陈天宁. 烧结金属纤维材料的吸声模型研究[J]. 西安交通大学学报, 2008,42(3):328-332.
张波, 陈天宁. Sound Absorption Model of Sintered Fibrous Metal[J]. 2008, 42(3): 328-332.
根据金属骨架多孔材料的特点
在Biot-Allard刚性骨架多孔材料内流吸声模型的基础上
考虑金属的热导特性
推导出一种新的、形式较简单的有效体积模量表达式
从而得到了一种扩展的吸声模型. 利用该扩展吸声模型对单层烧结不锈钢金属纤维板、2层及3层梯度组合金属纤维板的吸声特性进行了理论计算
并进行了相应的实验测试.研究结果表明
金属骨架对材料低频段的声吸收具有一定的强化作用
烧结作用使得纤维小幅振动对材料声吸收的贡献减小
与Biot-Allard模型相比
采用扩展模型计算出的烧结金属纤维材料的吸声特性理论结果与实验测试值在总体上更为一致
尤其是对高频段表面声阻抗率的计算.
According to the characters of porous metals
a new effective bulk modulus formula with simpler expression was obtained by considering the heat exchange between the metallic skeleton and air in pore on the basis of phenomenological Biot-Allard model
therefore an extended sound absorption model was put forward. The sound absorption characteristics of one-layer fibrous metal sheets
two-layer-assembled
and three-layer-assembled fibrous metal sheets were theoretically evaluated via the extended model. The corresponding acoustic measurements were performed and compared with the numerical results. It is found that the sound absorption in fibrous metal is somewhat enhanced due to the effect of metallic skeleton
and the sound absorption induced by the fiber vibrating of small amplitude is weakened due to the sintering process. Compared with the results from Biot-Allard model
theresults from the extended model coincide better with the measurement
especially for the surface acoustic impedances at higher frequencies.
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