Subwavelength and quasi-perfect underwater sound absorber for multiple and broad frequency bands

Yanni Zhang, Jie Pan, Kean Chen, Jie Zhong

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A structure for an underwater sound absorber with subwavelength thickness and a quasi-perfect absorption property at multiple frequency bands is reported. This absorber consists of a viscoelastic coating layer embedded with periodically distributed plate scatterers (PSs). The embedded PSs cannot only slow sound waves in the coating, leading to a down-shifted resonance frequency where the absorption is maximized, but also introduce multiple local bending modes and local longitudinal modes in the coating. Via proper selection of the parameters of the PSs and the PS array, multiple local resonance modes of different types in a coating unit can be excited, resulting in quasi-perfect absorption of incident sound at multiple frequencies whose wavelengths are much longer than the thickness of the coating layer. For example, absorption (89%) of underwater sound at 462.9 Hz is achieved by such a layer with a thickness of 6 cm, which is 1.9% of the wavelength of the incident sound. Broadband quasi-perfect absorption can also be realized by coupling of those multiple local resonant modes. This quasi-perfect absorption property can also be observed for sound waves with different incident angles, because a large number of local intrinsic modes could still be excited.

Original languageEnglish
Pages (from-to)648-659
Number of pages12
JournalJournal of the Acoustical Society of America
Volume144
Issue number2
DOIs
Publication statusPublished - 1 Aug 2018

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underwater acoustics
absorbers
coatings
scattering
sound waves
acoustics
wavelengths
Underwater
Sound
broadband
Thickness
Layer

Cite this

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title = "Subwavelength and quasi-perfect underwater sound absorber for multiple and broad frequency bands",
abstract = "A structure for an underwater sound absorber with subwavelength thickness and a quasi-perfect absorption property at multiple frequency bands is reported. This absorber consists of a viscoelastic coating layer embedded with periodically distributed plate scatterers (PSs). The embedded PSs cannot only slow sound waves in the coating, leading to a down-shifted resonance frequency where the absorption is maximized, but also introduce multiple local bending modes and local longitudinal modes in the coating. Via proper selection of the parameters of the PSs and the PS array, multiple local resonance modes of different types in a coating unit can be excited, resulting in quasi-perfect absorption of incident sound at multiple frequencies whose wavelengths are much longer than the thickness of the coating layer. For example, absorption (89{\%}) of underwater sound at 462.9 Hz is achieved by such a layer with a thickness of 6 cm, which is 1.9{\%} of the wavelength of the incident sound. Broadband quasi-perfect absorption can also be realized by coupling of those multiple local resonant modes. This quasi-perfect absorption property can also be observed for sound waves with different incident angles, because a large number of local intrinsic modes could still be excited.",
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Subwavelength and quasi-perfect underwater sound absorber for multiple and broad frequency bands. / Zhang, Yanni; Pan, Jie; Chen, Kean; Zhong, Jie.

In: Journal of the Acoustical Society of America, Vol. 144, No. 2, 01.08.2018, p. 648-659.

Research output: Contribution to journalArticle

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