Novel fractal acoustic metamaterials (FAMs) for multiple narrow-band near-perfect absorption

In this work, we introduce fractal acoustic metamaterials (FAMs), in thicknesses ranging from 5 (λ/69) to 25 mm (λ/18), which are observed to provide multiple narrow-band low-frequency absorptions of acoustic signals. The fractal structures used in this work are carefully designed and fabricated usi...

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Published in:Journal of applied physics 2022-07, Vol.132 (3)
Main Authors: Singh, Sanjeet Kumar, Prakash, Om, Bhattacharya, Shantanu
Format: Article
Language:English
Subjects:
Acoustic absorption
Acoustic propagation
Acoustic waves
Acoustics
Applied physics
Design
Design optimization
Fractals
Frequencies
Helmholtz resonators
Metamaterials
Propagation velocity
Regression analysis
Sound
Sound transmission
Wave propagation
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cited_by cdi_FETCH-LOGICAL-c327t-7b5ce17cb41177fe52b5c2e0eac831474800eaa5ecbc76b26f03aef25505f9253
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creator Singh, Sanjeet Kumar
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Bhattacharya, Shantanu
description In this work, we introduce fractal acoustic metamaterials (FAMs), in thicknesses ranging from 5 (λ/69) to 25 mm (λ/18), which are observed to provide multiple narrow-band low-frequency absorptions of acoustic signals. The fractal structures used in this work are carefully designed and fabricated using a side branch Helmholtz resonator design, making these structures easily tunable to multiple frequencies. Using different sizes of the side branches distributed in a fractally oriented configuration onto a plane rigid baseplate, the propagation velocity of acoustic waves is slowed down considerably. There is also a shifting resonating response of the structures toward lower frequencies (
doi_str_mv 10.1063/5.0093128
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list)
subjects Acoustic absorption
Acoustic propagation
Acoustic waves
Acoustics
Applied physics
Design
Design optimization
Fractals
Frequencies
Helmholtz resonators
Metamaterials
Propagation velocity
Regression analysis
Sound
Sound transmission
Wave propagation
title Novel fractal acoustic metamaterials (FAMs) for multiple narrow-band near-perfect absorption
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