Sound-absorption performance of a coupled square-neck embedded Helmholtz resonator

Abstract We propose a coupled square-neck embedded Helmholtz resonator (S-NEHR) with a deep-subwavelength thickness. By precisely designing each cell peak, the average sound–absorption coefficient of the nine coupled S-NEHR structure is greater than 0.9 at 300–410 Hz, and the thickness is only 1 / 3...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 61; no. 9; pp. 90902 - 90907
Main Authors Lin, Zhang, Yi-bo, Ke, Guang-hua, Wu, Meng, Tao
Format Journal Article
LanguageEnglish
Published Tokyo IOP Publishing 01.09.2022
Japanese Journal of Applied Physics
Subjects
Absorptivity
Broadband sound-absorption
composite structure
coupled structure
helmholtz resonator
Helmholtz resonators
low-frequency sound-absorption
Noise control
Sound
Sound transmission
Thickness
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Summary:Abstract We propose a coupled square-neck embedded Helmholtz resonator (S-NEHR) with a deep-subwavelength thickness. By precisely designing each cell peak, the average sound–absorption coefficient of the nine coupled S-NEHR structure is greater than 0.9 at 300–410 Hz, and the thickness is only 1 / 30 of the working wavelength. Adding a microperforated panel (MPP) in front of the coupled structure enables a smaller size and larger bandwidth (500–1000 Hz). The simulation and experimental results demonstrate that the S-NEHR structure has great application prospects in engineering noise control due to its extraordinary sound–absorption properties and compact structure.
Bibliography:JJAP-104277.R4
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/ac862f