水下夹芯复合空腔结构声学特性计算方法研究  

Acoustic property computing method for an underwater sandwich structure with cavum

作　　者：罗忠[1] 杨坤[2] 

机构地区：[1]海军工程大学科研部,武汉430033 [2]海军工程大学舰船工程系,武汉430033

出　　处：《振动与冲击》2013年第8期147-152,170,共7页Journal of Vibration and Shock

基　　金：国防重点基金资助项目

摘　　要：建立了水下夹芯复合空腔结构入射声波模型,运用刚性管中声波传播特性和声固耦合边界条件,提出了一种声学特性有限元计算方法。通过与钢制和橡胶中间层解析解,以及单层夹芯复合结构和夹芯舵结构传递矩阵法、试验结果比较,验证了计算方法对均质层的有效性。通过与经典文献周期空腔覆盖层结构空气背衬和水背衬条件下计算结果进行比较,本文计算方法与经典方法吻合较好,同时兼顾了结构整体弯曲振动对声学性能的影响。通过分析周期阵列边界条件对夹芯复合空腔结构的声学特性影响,补充验证了本文计算方法的可行性。The incident sound wave model of an underwater sandwich structure with cavum was built. A new computing method of acoustic property was presented using propagation property of sound wave in a rigid tube and boundary conditions with coupling of acoustic and structure. Through the contrast of acoustic properties of the medium layer between steel and rubber, a single sandwich composite structure, and a sandwich rudder structure, the effectiveness of the computing method was verified. The acoustic property of an anechoic layer with cavum was also studied. With this method, the influence of the bending vibration of the whole structure on its acoustic property was analyzed. It was shown that the effect of boundary conditions with periodic cavum on the acoustic property of a sandwich composite structure with cavum can be ignored.

关 键 词：夹芯复合结构 空腔 声学性能 计算方法 

分 类 号：TN911.7[电子电信—通信与信息系统]