期刊
APPLIED ACOUSTICS
卷 178, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2021.108026
关键词
Sub-wavelength sound absorption; Helmholtz resonator; Equivalent model; Critical coupling theory; Composite loaded sound absorber
类别
资金
- Key Research and Development Program of Shaanxi Province [2020GY-208]
- National Natural Science Foundation of China [11704314, 11474230]
- Foundation of Shaanxi Educational Committee [2018BSHYDZZ03]
- China Postdoctoral Science Foundation [2018M631194]
In this study, a composite loaded sound absorber (CLSA) was designed to achieve perfect sound absorption at specific frequencies using the complex frequency plane analysis method (CFPM), and broadband quasi-perfect sound absorption was achieved by applying different numbers of porous perfect absorber units. The experimental results confirmed the effectiveness of the CLSA in achieving quasi-perfect sound absorption.
We designed a composite loaded sound absorber (CLSA) composed of a sub-wavelength Helmholtz resonator and porous material, which was loaded on the side branches of a rectangular tube. Based on the transfer matrix method, an equivalent acoustic model was established to calculate the acoustic performance of the absorber. According to the equivalent acoustic model and critical coupling theory, a loaded absorber with thickness of 51 mm and perfect absorption at 156 Hz was achieved using the complex frequency plane analysis method (CFPM). The finite element simulation and acoustic experiment results verified the perfect sound absorption effect of the absorber at low frequencies. To overcome the defects of single frequency and narrow band of the perfect absorber, we designed nine different porous perfect absorber units that could achieve perfect sound absorption between 160 Hz and 312 Hz. Different numbers of porous perfect absorbers were placed on the side branch of the rectangular tube, and a broadband quasi-perfect sound absorption of more than 0.9 between 160 Hz and 285 Hz was realized by optimization. The experimental results further verified the quasi-perfect sound absorption effect of the CLSA. The theoretical model of low-frequency broadband quasi-perfect sound absorber and the design of a CLSA in this study provide a new possibility for the reduction of low or medium frequency noise in the tube. (C) 2021 Elsevier Ltd. All rights reserved.
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