Targeted band gap creation using mixed sonic crystal arrays including resonators and rigid scatterers

E Fuster-Garcia,J V Sánchez-Pérez,V Romero-García,L M García-Raffi

doi:10.1063/1.2748853

E Fuster-Garcia, J V Sánchez-Pérez + Show 2 more

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https://doi.org/10.1063/1.2748853

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Abstract

Sonic crystals are periodic structures that have acoustic band gaps centred at frequencies depending on the lattice constant of the array and on the direction of the incident acoustic wave. To eliminate this dependence, this work presents designed mixed structures constructed with rigid scatterers and resonators embedded in air. Specifically, balloons filled with a blend of air and helium were used as resonators, showing experimental evidence about the resonant behavior of an array formed with these balloons. As a result, the authors obtain full band gaps in a predetermined range of frequencies desired.

Highlights

In the last decade acoustic periodic composites based on heterogeneous materials, with a strong periodic modulation of the elastic constants between them, have been developed
Some of us have recently proven the possibility of creating band gaps, with SCs made with rigid scatterers in air, in a predetermined range of frequencies
In this letter we present evidence about the resonant behavior of an array of resonatorsballoons containing a blend of air and heliumembedded in air

Summary

Introduction

In the last decade acoustic periodic composites based on heterogeneous materials, with a strong periodic modulation of the elastic constants between them, have been developed. These composite materials, usually called sonic crystalsSCs, have the property of creating spectral band gaps that do not allow acoustic wave propagation in a predetermined range of frequencies, depending on the periodicity of the array formed. We have analyzed the acoustic behavior of mixed structures formed with both rigid cylinders and balloons in air.

Results

Conclusion