3 April 2013 Simulation and experiment research on smart metamaterial structures for wave isolation
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Abstract
This paper presents modeling and analysis methods for design of a smart metamaterial structure consisting of an isotropic beam and small spring-mass-damper subsystems for broadband absorption of transverse elastic waves. Two models of a unit cell are derived and used to demonstrate the existence of a stopband right to the high-frequency side of the local resonance frequency of spring-mass absorbers. A linear finite element method is used for detailed modeling and analysis of simply supported finite beams with different designs of absorbers. We show that the actual working mechanism is that, if the propagating elastic wave’s frequency is within the absorbers’ stopband, the wave resonates the integrated spring-mass absorbers to vibrate in their optical mode to create shear forces and bending moments to stop the wave propagation. We demonstrate that this unique phenomenon can be used to design broadband absorbers that work for elastic waves of short and long wavelengths. With appropriate design optimization calculations, finite discrete spring-mass absorbers can be used, and hence expensive micro- or nano-manufacturing techniques are not needed for such metamaterial beams for broadband vibration absorption/isolation. At last we do experiment to verify the simulation result.
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Yun Li, Hongwei Sun, Zhiming Li, "Simulation and experiment research on smart metamaterial structures for wave isolation", Proc. SPIE 8689, Behavior and Mechanics of Multifunctional Materials and Composites 2013, 86891L (3 April 2013); doi: 10.1117/12.2012122; https://doi.org/10.1117/12.2012122
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KEYWORDS
Metamaterials

Wave propagation

Acoustics

Beam propagation method

Composites

Finite element methods

Absorption

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