Negative mass sound shielding structures: Early results
Negative mass sound shielding structures: Early results
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DOI：
10.1002/pssb.200982040
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发表时间：
2009-09-01
影响因子：
1.6
通讯作者：
Hall, Andrew
中科院分区：
文献类型：
--
作者：
Calius, Emilio P.;Bremaud, Xavier;Hall, Andrew
弹性超材料或超复合材料可以被设计成在某些振动频率下具有负的有效质量密度，从而阻止波在该频带内通过材料传播。负质量行为是由材料内的谐振结构产生的，该谐振结构与施加到表面的声压波异相振荡180度。由于这项研究正处于起步阶段，本文描述了实验和数值领域正在进行的工作，以及包含几何简单弹簧-质量共振结构的固体的一些早期结果。行为的特点是实验上的动态测试的个别谐振器，以及阻抗管测量的面板状结构，包含多个谐振元件。实验结果显示出明确的证据，预期的共振，和部分带隙行为。本文介绍了单谐振单元和阻抗管的有限元模型的发展现状。迄今为止，他们的结果显示出良好的协议与质量定律和定性的协议与实验结果。(C)2009 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆
Elastic meta-materials or meta-composites can be designed to have a negative effective mass density at certain vibration frequencies, thus blocking wave propagation through the material within that frequency band. The negative mass behaviour is generated by resonant structures within the material that oscillate 180 degrees out of phase with the acoustic pressure waves applied to the surface. As this research is in its initial stages this paper describes work in progress in both the experimental and numerical domains, and some early results from solids containing geometrically, simple spring-mass resonant structures. Behaviour is characterized experimentally by dynamic tests of individual resonators as well as impedance tube measurements of panel-like structures containing multiple resonant elements. The experimental results exhibit clear evidence of the expected resonances, and partial band gap behaviour. Finite element models of both single resonant elements and impedance tube specimens are being developed, and the current status of these models is described. Their results to date show good agreement with the mass law and qualitative agreement with the experimental results.(C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim