期刊
APPLIED ACOUSTICS
卷 102, 期 -, 页码 126-132出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2015.10.001
关键词
Micro-perforated panel; Extended tubes; Sound absorption
类别
资金
- National Basic Research Program of China (973 Program) [2012CB720204]
- National Natural Science Foundation of China [11374326]
This paper is concerned with the use of a perforated panel with extended tubes (PPET) to improve the sound absorption confined to low frequencies. In comparison with a micro-perforated panel (MPP), the sound absorption can be significantly improved by using the PPET at the expense of the bandwidth of the sound absorption. A particular configuration combining four parallel-arranged PPETs with different cavities is introduced to achieve a wider bandwidth of the sound absorption at low frequencies. The analysis is extended to the combination of three parallel-arranged PPETs and a MPP to further increase the bandwidth of the sound absorption. A theoretical model is described to predict the sound absorption coefficient and the simulated annealing method is introduced to the proposed absorbers, allowing optimization of the overall performance. The theory with experimental validations demonstrates that the proposed configurations offer a potential improvement of more than one octave in the bandwidth of the sound absorption at low frequencies. (C) 2015 Elsevier Ltd. All rights reserved.
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