Ashok chakra-structured meta-structure as a perfect sound absorber for broadband low-frequency sound

We present thin acoustic meta-structures with subwavelength dimensions through which almost perfect sound absorption is achieved in the low-frequency domain. Our overall strategy builds on the fact that the sound absorption capabilities of the meta-structures primarily depend on the geometric dimens...

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Bibliographic Details
Published in:Applied physics letters 2020-11, Vol.117 (19)
Main Authors: Bhattacharya, Shantanu, Kumar, Sanjay, Singh, Sanjeet Kumar, Bhushan, Pulak, Sahu, Megha, Prakash, Om
Format: Article
Language:English
Subjects:
Acoustic absorption
Acoustic attenuation
Applied physics
Banded structure
Broadband
Frequencies
Frequency domain analysis
Genetic algorithms
Regression analysis
Sound
Sound transmission
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Summary:We present thin acoustic meta-structures with subwavelength dimensions through which almost perfect sound absorption is achieved in the low-frequency domain. Our overall strategy builds on the fact that the sound absorption capabilities of the meta-structures primarily depend on the geometric dimensions and can easily be reconfigured as per requirements through a change of geometry. To analyze various possibilities, we optimize the geometric structure through hybrid regression analysis using the genetic algorithm approach and finite element-based numerical simulations so that the geometry is tuned for high attenuation of acoustic signals over a broad range of frequencies. Both theoretical and experimental data show good parity and are able to establish the meta-structure nature of the assembly with respect to different frequency bands in the low frequency domain.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0022998