晶格常数对声学超材料板隔声特性的影响研究  

Influence of Lattice Constant on Sound Insulation Properties of Acoustic Metamterial Plates

作　　者：何晓栋 肖勇[1] 温激鸿[1] HE Xiaodong;XIAO Yong;WEN Jihong(Laboratory of Science and Technology on Integrated Logistics Support ,Intelligent Science Faculty, National University of Defense Technology, Changsha 410073,China)

机构地区：[1]国防科技大学智能科学学院装备综合保障技术重点实验室,长沙410073

出　　处：《噪声与振动控制》2018年第A01期51-55,共5页Noise and Vibration Control

基　　金：装备预研领域基金资助项目(61402100105)

摘　　要：基于有限元法研究含柱状局域共振单元的声学超材料板的隔声特性,探究多种结构设计方案下晶格常数对其隔声特性的影响。首先分析不限定附加共振单元质量情况下,晶格常数对隔声特性的影响,分析发现随着晶格常数变大,共振单元影响不断变小最后与均质板隔声曲线吻合。其次分析限定附加共振单元质量比100%前提下晶格常数的影响,分为固定或变化柱状局域共振单元半径两种情况讨论。固定半径的情况下,晶格常数取较小值取得隔声效果较好。变化半径的情况下,晶格常数不宜取得过大或过小,而应该取适中值。We use finite element method to investigate the influence of lattice constant on sound insulation properties of acoustic metamterial plates constructed by periodically depositing two-layer cylindrical stubs on the surface of a thin homogeneous plate. In this investigation we present several structure design schemes. First scheme is that the mass ratio of resonators to the plate is not limited. Numerical results show that the effect of the resonators become less obvious along with the decrease of lattice constant. The second scheme is that the mass ratio of resonators to plate limited to 100%.When the radius of stubs is fixed, the smaller the lattice constant the better sound insulation properties. When the radius of stubs change with lattice constant, the lattice constant should be neither too large or too small to realize broadband sound insulation performance.

关 键 词：声学 声学超材料板 晶格常数 隔声特性 能带结构 

分 类 号：TU112.41[建筑科学—建筑理论]