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Proceedings Paper

Acoustic metamaterial with negative parameter
Author(s): Hongwei Sun; Fei Yan; Hao Gu; Ying Li
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Paper Abstract

In this paper we present theoretical results on an acoustic metamaterial beam and a bar that exhibit negative effective mass and negative effective stiffness. A one-dimensional acoustic metamaterial with an array of spring-mass subsystems was fabricated. The frequency of the acoustic one dimensional metamaterial structure has the same form as that of the permittivity in metals due to the plasma oscillation. We also provide a theory to explain the simulation results. And we use the concept of conventional mechanical vibration absorbers to reveal the actual working mechanism of the acoustic metamaterials. We explain the two vibrate modes which are optical mode and acoustic mode in detail. When the incoming elastic wave in the acoustic metamaterials to resonate the integrated spring-mass-damper absorbers to vibrate in their optical mode at frequencies close to but above their local resonance frequencies to create shear forces and bending moments to straighten the beam and stop the wave propagation. Moreover, we explain the negative parameter in acoustic metamaterials.

Paper Details

Date Published: 9 March 2014
PDF: 6 pages
Proc. SPIE 9063, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014, 906324 (9 March 2014); doi: 10.1117/12.2035707
Show Author Affiliations
Hongwei Sun, Jiangsu Automation Research Institute (China)
Nanjing Univ. of Science and Technology (China)
Fei Yan, Jiangsu Automation Research Institute (China)
Hao Gu, Jiangsu Automation Research Institute (China)
Ying Li, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 9063:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014
H. Felix Wu; Tzu-Yang Yu; Andrew L. Gyekenyesi; Peter J. Shull, Editor(s)

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