Open AccessResearch of Acoustically Improved Helmholtz Resonator
Author(s) -
Jun Li,
Shan Jingwei,
Guo Zhengyang,
Levtsev Aleksei
Publication year - 2021
Publication title -
bûlletenʹ nauki i praktiki
Language(s) - English
Resource type - Journals
ISSN - 2414-2948
DOI - 10.33619/2414-2948/62/27
Subject(s) - helmholtz resonator , resonator , helmholtz free energy , acoustics , muffler , resonance (particle physics) , transmission loss , tube (container) , helmholtz equation , finite element method , acoustic resonance , helical resonator , physics , materials science , optics , particle physics , quantum mechanics , composite material , thermodynamics , boundary value problem
The three-dimensional acoustic finite element method is used to predict the transmission loss of the Helmholtz resonance muffler. The results are in good agreement with the experimental results, indicating the applicability and accuracy of the numerical method used in this paper. On the one hand, in order to reduce the resonance frequency without changing the shape of the resonator, the connecting tube is extended to the inside of the resonator, and the influence of the extension length and the cross section shape of the extension tube on the acoustic characteristics of the resonator is discussed in detail. On the other hand, in order to broaden the muffled frequency band of the traditional Helmholtz resonators, the resonators are combined in series and parallel, and the influence of the combined structure on the acoustic characteristics is discussed in detail.