摘要
潜艇吸声覆盖层在低频对抗主动声纳的探测是目前面临的一个重要技术难题.利用空腔共振时的吸收是解决低频吸声问题的一种有效途径.文中在假设入射球形纵波完全被腔壁反射的情形下,对球形空腔嵌入层的共振特性进行了理论分析.结果表明,在粘弹性介质中嵌入适当厚度的低剪切波速包覆层能有效地降低空腔共振的频率.
To counteract the detection of low-frequency active sonar by anechoic coating is an important technique problem. Sound absorption by cavity resonance is an effective solution to solve the lowfrequency anechoic problem. The resonance behavior of a spherical cavity with a coating in an infinite viscoelastic medium is calculated on the assumption that an incident spherical dilatational wave is entirely reflected at the cavity walls. It is shown that the resonance frequency of cavity can be reduced effectively with a proper thickness of the coating.
出处
《海军工程大学学报》
CAS
北大核心
2005年第4期50-52,68,共4页
Journal of Naval University of Engineering
关键词
共振
粘弹性
球形空腔
resonance
viscoelasticity
spherical cavity
