空气背衬条件下水中夹芯复合空腔结构吸声特性影响因素分析  

Absorption Character Analysis of the Sandwich Composite Structure with Cavum in Air Backing

作　　者：罗忠[1] 胡俊波[1] 

机构地区：[1]海军工程大学科研部,武汉430033

出　　处：《武汉理工大学学报》2013年第8期66-71,共6页Journal of Wuhan University of Technology

基　　金：国防重点基金资助项目

摘　　要：夹芯复合结构是集承载和声隐身于一体的新型吸声结构形式,空腔谐振能够显著改善其低频段吸声性能。针对空气背衬条件下水中夹芯复合空腔结构,采用有限元计算方法,对比分析了芯材材料参数、空腔几何参数、水层厚度等对谐振峰值、峰值频率、吸声带宽的影响规律,为样机声学设计和模型试验提供了输入。结果表明:芯材模量越小,泊松比越大,密度越大,空腔间距越小,直径或体积越大,距迎声面越远,谐振吸声峰值频率向低频移动,带宽越窄。Sandwich composite is a new acoustic stealth structure, implementing both loading and absorption. The res- onance of cavum can improve the absorption effect in low frequency. This paper uses FEM analysis method, to analyze the effect of sandwich material parameter, cavum physical parameter and water thickness, in air backing. It can support the acoustic design and model experiment. The results indicate that with decrease of module, increase of poisson ratio and density of sandwich, and with smaller of cavum interval, bigger of diameter and volume, farther from the incident face, the resonance absorption peak is moving toward lower frequency, and the absorption band is more narrow.

关 键 词：夹芯复合结构 空腔 谐振 吸声系数 空气背衬 

分 类 号：TN911.7[电子电信—通信与信息系统]