Article
Version 1
Preserved in Portico This version is not peer-reviewed
Tunable Helmholtz Resonators using Multiple Necks
Version 1
: Received: 14 September 2023 / Approved: 14 September 2023 / Online: 15 September 2023 (03:59:00 CEST)
A peer-reviewed article of this Preprint also exists.
Papadakis, N.M.; Stavroulakis, G.E. Tunable Helmholtz Resonators Using Multiple Necks. Micromachines 2023, 14, 1932. Papadakis, N.M.; Stavroulakis, G.E. Tunable Helmholtz Resonators Using Multiple Necks. Micromachines 2023, 14, 1932.
Abstract
One of the uses of Helmholtz resonators is as sound absorbers for room acoustic applications, especially for the low frequency range. Their efficiency is centered around their resonance frequency which is mainly depended on elements of their geometry such as the resonator volume and neck dimensions. Incorporating additional necks on the body of a Helmholtz resonator (depending on whether they are open or closed) has been found to alter the resulted resonance frequency. For this study, tunable Helmholtz resonators to multiple resonance frequencies, are proposed and investigated utilizing additional necks. The resonance frequencies of various multi-neck Helmholtz resonators are first modeled with the use of finite element method (FEM), then calculated with the use of an analytical approach and the results of the two approaches are finally compared. Results of this study show that Helmholtz resonators with multiple resonances at desired frequencies are achievable with the use of additional necks, while FEM and analytical methods can be used for the estimation of the resonance frequencies. Analytical and FEM approach results show a good agreement in cases of small number of additional necks, while the increasing differences in cases of higher neck additions, were attributed to the change in effective length of the necks as demonstrated by FEM. The proposed approach can be useful for tunable sound absorbers for room acoustics applications according to the needs of a space. Also, this approach can be applied in cases of additional tunable air resonances of acoustic instruments (e.g. string instruments).
Keywords
Helmholtz resonator; multi-neck Helmholtz resonator; sound absorber; architectural acoustics; room acoustics; musical acoustics; finite element method; sound absorption; acoustic transmission
Subject
Physical Sciences, Acoustics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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