Hybrid acoustic metamaterial as super absorber for broadband low-frequency sound.
Hybrid acoustic metamaterial as super absorber for broadband low-frequency sound.
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DOI：
10.1038/srep43340
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发表时间：
2017-02-27
影响因子：
4.6
通讯作者：
Lu TJ
中科院分区：
文献类型：
--
作者：
Tang Y;Ren S;Meng H;Xin F;Huang L;Chen T;Zhang C;Lu TJ
提出了一种新型的混合声学超材料吸声体，它具有上级的低频宽带吸声性能和优异的机械刚度/强度。本文在蜂窝-蜂窝混合芯（H-C混合芯）的基础上，在蜂窝芯的上表面和下表面均引入穿孔，形成穿孔蜂窝-蜂窝混合芯（PHCH），以获得超宽带低频吸声效果。应用微穿孔板理论，建立了一种计算这种新型超材料吸声系数的理论方法。完美的声音吸收被发现在只有几百赫兹与两个倍频程0.5吸收带宽。为了验证该模型，建立了有限元模型，计算了吸声系数，分析了粘热耗散。结果表明，在穿孔区的粘性能量耗散占主导地位的总能量消耗。这种新型的声学超材料具有良好的工程应用前景，可以作为一种具有优异的低频吸声性能、刚度/强度和冲击能量吸收性能的多功能材料。
A hybrid acoustic metamaterial is proposed as a new class of sound absorber, which exhibits superior broadband low-frequency sound absorption as well as excellent mechanical stiffness/strength. Based on the honeycomb-corrugation hybrid core (H-C hybrid core), we introduce perforations on both top facesheet and corrugation, forming perforated honeycomb-corrugation hybrid (PHCH) to gain super broadband low-frequency sound absorption. Applying the theory of micro-perforated panel (MPP), we establish a theoretical method to calculate the sound absorption coefficient of this new kind of metamaterial. Perfect sound absorption is found at just a few hundreds hertz with two-octave 0.5 absorption bandwidth. To verify this model, a finite element model is developed to calculate the absorption coefficient and analyze the viscous-thermal energy dissipation. It is found that viscous energy dissipation at perforation regions dominates the total energy consumed. This new kind of acoustic metamaterials show promising engineering applications, which can serve as multiple functional materials with extraordinary low-frequency sound absorption, excellent stiffness/strength and impact energy absorption.