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SeMSA：一种紧凑的超级吸收器，针对宽带低频噪声衰减进行了优化。

SeMSA: a compact super absorber optimised for broadband, low-frequency noise attenuation.

作者信息

McKay Andrew, Davis Ian, Killeen Jack, Bennett Gareth J

机构信息

Department of Mechanical and Manufacturing Engineering, Trinity College Dublin, The University of Dublin, Dublin, Ireland.

Efficient Energy Transfer (ηET) Department, Nokia Bell Labs, Blanchardstown Business and Technology Park, Dublin 15, Ireland.

出版信息

Sci Rep. 2020 Oct 21;10(1):17967. doi: 10.1038/s41598-020-73933-0.

DOI:10.1038/s41598-020-73933-0
PMID:33087735
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7578840/
Abstract

The attenuation of low-frequency broadband noise in a light, small form-factor is an intractable challenge. In this paper, a new technology is presented which employs the highly efficient visco-thermal loss mechanism of a micro-perforated plate (MPP) and successfully lowers its frequency response by combining it with decorated membrane resonators (DMR). Absorption comes from the membranes but primarily from the MPP, as the motion of the two membranes causes a pressure differential across the MPP creating airflow through the perforations. This combination of DMR and MPP has led to the Segmented Membrane Sound Absorber (SeMSA) design, which is extremely effective at low-frequency broadband sound absorption and which can achieve this at deep sub-wavelength thicknesses. The technology is compared to other absorbers to be found in the literature and the SeMSA outperforms them all in either the 20-1000 Hz or 20-1200 Hz range for depths of up to 120 mm. This was verified through analytical, finite element and experimental analyses.

摘要

在轻薄、小尺寸外形中实现低频宽带噪声的衰减是一项棘手的挑战。本文提出了一种新技术，该技术利用微穿孔板（MPP）的高效粘热损耗机制，并通过将其与装饰膜谐振器（DMR）相结合，成功降低了其频率响应。吸收主要来自膜，但主要来自微穿孔板，因为两个膜的运动在微穿孔板上产生压差，从而使气流通过穿孔。DMR和MPP的这种组合产生了分段膜吸声器（SeMSA）设计，该设计在低频宽带吸声方面极其有效，并且可以在深亚波长厚度下实现这一点。将该技术与文献中发现的其他吸声器进行了比较，在深度达120毫米的情况下，SeMSA在20 - 1000赫兹或20 - 1200赫兹范围内的性能均优于其他吸声器。这通过解析、有限元和实验分析得到了验证。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/f585c63f5b63/41598_2020_73933_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/49c4f9457855/41598_2020_73933_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/e8bc3a2327c9/41598_2020_73933_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/840650e6dc4b/41598_2020_73933_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/00420d94aee9/41598_2020_73933_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/6c7838e64322/41598_2020_73933_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/4a380b22410f/41598_2020_73933_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/10f6fb6e5b9a/41598_2020_73933_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/b4d039d5b63e/41598_2020_73933_Fig14_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/2db25c3baf4c/41598_2020_73933_Fig15_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/def1f1e066ed/41598_2020_73933_Fig16_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/073c/7578840/d298da892370/41598_2020_73933_Fig17_HTML.jpg
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本文引用的文献

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Phys Rev Lett. 2013 Aug 2;111(5):055501. doi: 10.1103/PhysRevLett.111.055501. Epub 2013 Jul 29.
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Locally resonant sonic materials.局部共振声学材料。
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