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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Bibliographic Details
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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Summary: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 (
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0093128