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Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators

Abhishek Gautam, Alper Celik Orcid Logo, Mahdi Azarpeyvand

Acoustics, Volume: 5, Issue: 4, Pages: 1123 - 1135

Swansea University Author: Alper Celik Orcid Logo

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DOI (Published version): 10.3390/acoustics5040063

Abstract

The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the acoustic performance of double-degree-of-freedom res...

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Published in: Acoustics
ISSN: 2624-599X
Published: MDPI AG 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa65596
Abstract: The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the acoustic performance of double-degree-of-freedom resonators, both experimentally and numerically, for varying cavity volume ratios. The underlying sound attenuation mechanism is studied by analysing the acoustic pressure fields within the resonator cavities. An increase in the septum neck is shown to lower the frequencies affected by the resonator. In addition, it deteriorates and significantly improves the sound attenuation performance at the primary and secondary peak transmission-loss frequencies, respectively.
Keywords: Helmholtz resonator; impedance tube; acoustic liner
College: Faculty of Science and Engineering
Funders: he research was supported by the European Commission through project AERIALIST (AdvancEd aicRaft-noIse-AlLeviationdevIceS using meTamaterials), H2020-MG-1.4-2016-2017, project no. 723367.
Issue: 4
Start Page: 1123
End Page: 1135

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