Acoustic metamaterial using hollowed star-shaped structure with slits

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-06-19 DOI:10.1016/j.apacoust.2025.110893

Yung Boon Chong , Zhenyu Chen , Yapeng Li , Kian Meng Lim , Heow Pueh Lee

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引用次数: 0

Abstract

Undesirable noise negatively affects quality of life, yet current noise reduction solutions often struggle with low-frequency sounds. Recent interest in acoustic metamaterials stems from their lightweight nature, airflow facilitation, and tunable acoustic bandgaps. Advances in additive manufacturing enable the creation of complex metamaterials more easily. This study investigates a 3D-printed hollow star-shaped structure with slits at each vertex, arranged periodically. The star-shaped structure acts as a Helmholtz resonator due to its air cavities, allowing for effective sound absorption at selected frequency. By leveraging Helmholtz resonance and a hexagonal lattice arrangement, such acoustic metamaterial can control and expand the bandgaps for targeted frequencies. Numerical simulations using finite element methods (FEM) and laboratory experiments were conducted to assess the acoustic performance of this metamaterial. Results showed a significant insertion loss (IL) peak of + 12 dB between 4000 and 5000 Hz, influenced by the orientation of the star-shaped resonators. Acoustic cameras were used to visualize energy flow in and around the metamaterial chamber. Overall, experimental and simulation results demonstrated a strong correlation, highlighting the effectiveness of the star-shaped resonators in noise mitigation.

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声学超材料采用中空的带缝隙的星形结构

不受欢迎的噪音会对生活质量产生负面影响，但目前的降噪解决方案往往与低频声音作斗争。最近对声学超材料的兴趣源于它们的轻量化、气流促进和可调谐的声学带隙。增材制造的进步使得制造复杂的超材料变得更加容易。本研究研究了一个3d打印的空心星形结构，每个顶点都有裂缝，周期性排列。由于其空腔，星形结构充当亥姆霍兹谐振器，允许在选定频率下有效吸收声音。通过利用亥姆霍兹共振和六边形晶格排列，这种声学超材料可以控制和扩大目标频率的带隙。采用有限元方法和室内实验对该超材料的声学性能进行了数值模拟。结果表明，在4000 ~ 5000 Hz范围内，受星形谐振器方向的影响，插入损耗（IL）峰值为+ 12 dB。声学摄像机被用来观察超材料腔内和周围的能量流动。总体而言，实验和仿真结果显示了很强的相关性，突出了星形谐振器在降噪方面的有效性。

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

期刊介绍： Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.