学术
摘 要:
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．[著者文摘]
文章出处:
《西安交通大学学报》-2008年42卷3期 -328-332页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
0253-987X（2008）03-0328-05
Sound Absorption Model of Sintered Fibrous Metal
ZHANG Bo, CHEN Tianning （School of Mechanical Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China）
Abstract:
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, the results from the extended model coincide better with the measurement, especially for the surface acoustic impedances at higher frequencies.[著者文摘]
Key words:
sound absorption model; acoustic impedance; bulk modulus; fibrous metal
基金资助:
国家重点基础研究发展计划资助项目（2006CB601204）;国家自然科学基金重点资助项目（10632060）.
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