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Tunable Acoustic Wave Propagation Through Planar Auxetic Metamaterial

Published online by Cambridge University Press:  17 July 2017

J. H. He  and
H. H. Huang
J. H. He
Affiliation:
Department of Engineering Science and Ocean EngineeringNational Taiwan UniversityTaipei, Taiwan
H. H. Huang*
Affiliation:
Department of Engineering Science and Ocean EngineeringNational Taiwan UniversityTaipei, Taiwan
*
*Corresponding author ([email protected])
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Abstract

This paper presents a tunable planar auxetic metamaterial (PAM) for controlling and filtering acoustic waves and provides guidelines for bandgap design of the proposed PAMs. Numerical results for deformed and undeformed PAMs were obtained from several finite element analyses based on Bloch–Floquet theory. The acoustic band structures of the PAMs were calculated with periodic boundaries. Tunable bandgaps in certain frequency ranges were generated by various deformations applied to the PAMs. Wave attenuation in experimental transmission loss at specific frequencies was demonstrated, showing favorable agreement with the bandgaps obtained from numerical calculations. Both the numerical and experimental results indicate that the proposed structure demonstrates great tunability and offers significant advantages over the regular materials for controlling sound wave propagation and filtering sound waves within specific frequency ranges.

Keywords

Acoustic metamaterialAuxeticsWave propagationTunable bandgap
Type
Research Article
Information
Journal of Mechanics , Volume 34 , Issue 2 , April 2018 , pp. 113 - 122
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2018 

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