Broadband acoustic attenuation in microperforated meta-shells with ventilation
Broadband acoustic attenuation in microperforated meta-shells with ventilation
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DOI：
10.1063/5.0152725
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发表时间：
2023-06
影响因子：
4
通讯作者：
Jiajia Chen;Yonghui Zhang;Yukai Yu;Yao Zhai;H. Nguyen;S. Tracy;Xiaoming Zhou;Guoliang Huang
中科院分区：
文献类型：
--
作者：
Jiajia Chen;Yonghui Zhang;Yukai Yu;Yao Zhai;H. Nguyen;S. Tracy;Xiaoming Zhou;Guoliang Huang
在广泛的频率范围内实现声音衰减，同时保持足够的通风仍然是声学工程中的一个重大挑战，因为衰减能力和通风之间存在严格的权衡。在这封信中，我们提出了一种双层微穿孔元壳作为宽带声通风屏障。首先采用多重散射理论来表征所提出的设计的声音衰减性能，包括声音吸收和传输损失，这在以前没有报道过。实验结果表明，由于插入具有特定穿孔率的微芯内壳，吸收效果得到了很好的增强。该机制可归因于细胞间耦合，通过用多孔海绵包裹元壳，进一步利用细胞间耦合来设计不同的配置。发现额外添加一层海绵可以进一步改善低频衰减性能。所提出的具有有效通风的宽带声屏障可以在建筑声学和办公室隔音方面找到潜在的应用。
Achieving sound attenuation across a broad frequency range while maintaining adequate ventilation remains a significant challenge in acoustic engineering, as there exists a rigid trade-off between attenuation ability and ventilation. In this Letter, we propose a double-layered microperforated meta-shells to serve as broadband acoustic ventilation barrier. Multiple scattering theory is first employed to characterize sound attenuation performance of the proposed design in terms of both sound absorption and transmission loss, which is not reported before. Experimental result demonstrates a good enhancement of absorption due to the insertion of inner shell with a specific perforation rate of micro cores. The mechanism can be attributed to the inter-cell coupling, which is further utilized to devise a different configuration by wrapping the meta-shell with porous sponge. It is found that adding an extra layer of sponge can further improve the low-frequency attenuation performance. The proposed broadband sound barrier with effective ventilation can find potential applications in architectural acoustics and office noise insulation.