深亚波长宽带超表面与微穿孔板和延长颈亥姆霍兹谐振器

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-04-08 DOI:10.1063/5.0258251

Jiayu Wang, Gareth J. Bennett

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引用次数: 0

摘要

本研究开发、制造并表征了一种用于噪声吸收的深亚波长宽带声学超表面。超表面由微穿孔板和扩展颈亥姆霍兹谐振器耦合组成，形成一个单元吸收器，称为亥姆霍兹谐振器吸收器（MHA）。实验结果表明，48 mm深的MHA在150 Hz时可以达到近乎完美的吸声效果（97%）。这种性能是在亚波长厚度仅为工作波长的1/48和体积归一化波长比为1/54的情况下实现的。此外，MHA具有48 Hz的半吸收带宽。为了在保持吸声面积不变的情况下扩大吸声带宽，进一步减小吸声总厚度，提出了一种由三个紧凑MHA （Compact MHA）单元组成的结构。实验结果表明，在300-500 Hz范围内，CMHA的平均吸声系数（SAC）超过0.74，其总厚度仅为27.5 mm，吸声系数（SAC）为0.74；在543-945 Hz范围内0.88，厚度减少26.2 mm。实验结果与理论和数值预测相比较，突出了所提出的设计在实际噪声控制应用中的潜力。

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Deep sub-wavelength broadband metasurface with micro-perforated panels and extended-neck Helmholtz resonators

This study develops, fabricates, and characterizes a deep sub-wavelength broadband acoustic metasurface for noise absorption. The metasurface is composed of micro-perforated panels coupled with extended-neck Helmholtz resonators, forming a unit absorber referred to as Helmholtz resonator absorber (MHA). Experimental results demonstrate that a 48 mm deep MHA achieves near-perfect sound absorption (>97%) at 150 Hz. This performance is realized with a sub-wavelength thickness of only 1/48 of the operating wavelength and a volume-normalized wavelength ratio of 1/54. Additionally, the MHA exhibits a half-absorption bandwidth of 48 Hz. To broaden the sound absorption bandwidth while keeping the total area constant and to further reduce the total thickness, a configuration integrating three Compact MHA (CMHA) units is proposed. Experimental results demonstrate that the CMHA achieves an average sound absorption coefficient (SAC) exceeding 0.74 in the 300–500 Hz range with an overall thickness of only 27.5 mm and an SAC > 0.88 in the 543–945 Hz range with a reduced thickness of 26.2 mm. Experimental results compare well with theoretical and numerical predictions, highlighting the potential of the proposed design for practical noise control applications.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.