3.8 Proceedings Paper

Acoustic Metamaterial with Negative Parameter

出版社

SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2035707

关键词

acoustic metamaterial; negative mass; negative stiffness; elastic waves; spring-mass subsystems

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资金

  1. Natural Science Foundation of Jiangsu Province [SBK201342842]

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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.

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