Helmholtz resonator with two resonance frequencies by coupling with a mechanical resonator

This contribution presents the acoustical properties and corresponding theoretical descriptions of a Helmholtz resonator with an integrated cantilever inside the Helmholtz resonator neck. The advantage of this resonator design is a second resonance frequency, which leads to a supplemental frequency region with high sound absorption properties. An analytical model is derived to calculate the resonance frequencies and the absorption coefficient of the resonator system. This model has been verified with finite element simulations for the resonance frequencies, taking into account several geometric parameter variations. It has been validated experimentally for the calculated absorption coefficients by impedance tube measurements. In conclusion, it has been found a high influence of the geometric parameters on the resonance frequencies and a broader sound absorption performance of the coupled resonator system.

absorption, cantilever, Helmholtz resonator, lightweight, mechanical absorber, resonance frequency, Absorption, Lightweight, Resonance frequency, Cantilever, Mechanical absorber

10.1016/j.jsv.2023.117747

0022-460X

Hoppen, Hannah

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Langfeldt, Felix

2bf86877-f2cd-4c35-be0f-e38a718a915c

Gleine, Wolfgang

6b99025f-b44a-46a8-b699-ec25962c7e75

Von Estorff, Otto

7b2f7283-9bab-49e4-9ac8-baaa061e769d

1 September 2023

Hoppen, Hannah

f609ed2b-6b7a-4a2e-89c9-45fd11ee50a0

Langfeldt, Felix

2bf86877-f2cd-4c35-be0f-e38a718a915c

Gleine, Wolfgang

6b99025f-b44a-46a8-b699-ec25962c7e75

Von Estorff, Otto

7b2f7283-9bab-49e4-9ac8-baaa061e769d

Hoppen, Hannah, Langfeldt, Felix, Gleine, Wolfgang and Von Estorff, Otto (2023) Helmholtz resonator with two resonance frequencies by coupling with a mechanical resonator. Journal of Sound and Vibration, 559, [117747]. (doi:10.1016/j.jsv.2023.117747).

Record type: Article

Abstract

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Manuscript_JSV-D-23-00106_Rev1 - Accepted Manuscript

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Accepted/In Press date: 22 April 2023

e-pub ahead of print date: 3 May 2023

Published date: 1 September 2023

Additional Information: Funding Information: The actual research is financed by a scholarship inside the project Pro Exzellenzia plus funded by the European Social Fund (ESF) and the Free and Hanseatic City of Hamburg, Germany . Former work has been performed under the framework of the research project Flight-LAB, funded by the Federal Ministry for Economic Affairs and Energy, Germany [grant number: 20K1511D] . The financial support is gratefully acknowledged by the authors. Publisher Copyright: © 2023 Elsevier Ltd

Keywords: absorption, cantilever, Helmholtz resonator, lightweight, mechanical absorber, resonance frequency, Absorption, Lightweight, Resonance frequency, Cantilever, Mechanical absorber