利用空腔耗散增强亥姆霍兹共振超材料的吸声,Materials Horizons

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利用空腔耗散增强亥姆霍兹共振超材料的吸声
Materials Horizons ( IF 12.2 ) Pub Date : 2023-05-04 , DOI: 10.1039/d3mh00428g
Xinwei Li ₁ , Xiang Yu ₂ , Jun Wei Chua ₁ , Wei Zhai ₁

Affiliation

亥姆霍兹共振基于孔腔结构的共振，构成了大多数吸声超材料的主要吸声机制。通常，增强此类吸声器的吸声效果需要进行大量的几何重新设计或添加耗散材料，考虑到体积和质量限制，这是不理想的。在这里，我们引入了一种新方法——即简单地重塑空腔，而不改变其整体质量和体积——以显着增强吸声效果。这是通过使空腔壁靠近孔隙来实现的，沿着这些边界可以发生额外的热粘性耗散。经过实验验证，长方体空腔的三个侧面靠近孔隙，并且在特定的孔隙-空腔几何形状下，与原始结构相比，最大吸收率提高了 44%。通过数值模拟，我们充分阐明了结构-性能关系及其机制，并提出了设计和优化的分析模型。最终，利用这一概念，我们展示了一种异质多孔宽带（1500 至 6000 Hz）吸收器，该吸收器在 18 毫米的极薄厚度下表现出 0.74 的出色平均吸收系数。总的来说，我们引入了一种新的通用概念，可以彻底改变亥姆霍兹谐振器的设计原理，并展示其设计先进吸声超材料的潜力。

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Harnessing cavity dissipation for enhanced sound absorption in Helmholtz resonance metamaterials

Helmholtz resonance, based on resonance through a pore-and-cavity structure, constitutes the primary sound absorption mechanism in majority of sound-absorbing metamaterials. Typically, enhancing sound absorption in such absorbers necessitates substantial geometrical redesign or the addition of dissipative materials, which is non-ideal considering the volume and mass constraints. Herein, we introduce a new approach – that is to simply reshape the cavity, without alterations to its overall mass and volume – to drastically enhance sound absorption. This is achieved by bringing the cavity walls close to the pores where additional thermoviscous dissipation along these boundaries can occur. Experimentally validated, with three sides of the cuboid cavity close to the pore and at a particular pore–cavity geometry, a 44% gain in maximum absorption is achieved compared to the original structure. Through numerical simulations, we fully elucidate structure–property relationships and their mechanisms, and propose analytical models for design and optimization. Ultimately, utilizing this concept, we demonstrate a heterogeneously porous broadband (1500 to 6000 Hz) absorber that exhibits an excellent average absorption coefficient of 0.74 at a very low thickness of 18 mm. Overall, we introduce a new and universal concept that could revolutionize the design principles of Helmholtz resonators, and demonstrate its potential for designing advanced sound-absorbing metamaterials.

更新日期：2023-05-04

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