Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions
Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions
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DOI：
10.1016/j.eml.2016.10.012
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发表时间：
2017-04-01
影响因子：
4.7
通讯作者：
Ampatzidis, T.
中科院分区：
文献类型：
--
作者：
Chronopoulos, D.;Antoniadis, I.;Ampatzidis, T.
尽管在机械系统中引入负刚度（NS）元素的概念在40多年前就已经形成并得到了验证，但直到最近才受到一致的关注。在这项工作中，分层的机械超材料的设计已实施NS夹杂物，其声波传播特性建模。为了计算超材料结构的频率相关阻尼损耗因子，发展了一种专用的二维周期结构理论方案。在统计能量分析（SEA）方案内计算通过建模面板的声传输特性。它表明，所建议的分层超材料具有非常上级的隔音性能接近和以上的声学重合范围，由于其结构阻尼性能的大幅增加暗示的NS元素。此外，当与等效质量的粘弹性阻尼约束层相比时，所提出的配置在宽带频率范围内呈现出上级性能。(C)2016爱思唯尔有限公司版权所有。
Despite the fact that the concept of incorporating Negative Stiffness (NS) elements within mechanical systems was formulated and validated more than 40 years ago, it has only recently received consistent attention. In this work, the design of a layered mechanical metamaterial having implemented NS inclusions is presented and its acoustic wave propagation properties are modelled. A dedicated two-dimensional periodic structure theory scheme is developed in order to compute the frequency dependent damping loss factor of the metamaterial structure. The acoustic transmission properties through the modelled panel are computed within a Statistical Energy Analysis (SEA) scheme. It is demonstrated that the suggested layered metamaterial exhibits highly superior acoustic insulation performance close and above the acoustic coincidence range, thanks to the drastic increase of its structural damping properties implied by the NS elements. Additionally, the proposed configuration presents superior performance in a broadband frequency range when compared to a viscoelastic damping constraint layer of equivalent mass. (C) 2016 Elsevier Ltd. All rights reserved.