摘要
以烧结金属纤维多孔材料为对象,研究了材料的非线性静流阻特性,以及在高声强下的吸声特性。提出了通过线化的奥森方程,推导Forchheimer关系中非线性系数的方法,得到半经验的非线性流阻模型,并给出了相关的实验对比;结合非线性流阻模型和Umnova-Attenborough的声学模型,进而预测金属纤维材料在高声强下的非线性吸声性能,并与实验做了比较,结果比较一致。同时,也对纤维多孔材料非线性吸声机理做了一些简要阐述。所提的预测方法对纤维吸声材料的设计和优化有一定指导意义,尤其是在高声强环境中。
In this article, sintered fibrous porous metals are targeted to study the nonlinear flow resistivity and their ab- sorption characteristics at high sound pressure levels. A method of deriving the nonlinear coefficient of the Forchheimer relation for highly porous fibrous metals is proposed by solving Oseen＇s equation, and a semi-empirical flow resistivity model is obtained in this article. The nonlinear absorption performance of fibrous porous metals can be predicted by employing an acoustical model for sound absorption at high sound pressure levels. The theoretical prediction agrees with experiments. The absorption mechanism of fibrous porous metals is also briefly analyzed. The method in this paper could have certain guiding significance for the design and optimization of fibrous porous metals, especially in the high sound pressure level envirofiment.
出处
《声学技术》
CSCD
2009年第4期450-453,共4页
Technical Acoustics
基金
国家自然科学基金(1077415)
国家重点基础研究发展计划(2006CB601204)
关键词
金属纤维多孔材料
流阻
非线性系数
高声强
fibrous porous metals
flow resistivity
nonlinear parameter
high sound pressure levels
