谐振器
声学
超材料
声阻抗
材料科学
电阻抗
吸收(声学)
共振(粒子物理)
亥姆霍兹自由能
低频
声波
宽带
物理
亥姆霍兹谐振器
声压
光学
光电子学
超声波传感器
原子物理学
天文
量子力学
作者
Yingqin Luo,Jingjun Lou,Y. B. Zhang
标识
DOI:10.1142/s0217984921503978
摘要
An ultra-thin waterborne acoustic metamaterial (AM), which is made of steel and composed of multi-Helmholtz resonators (MHRs), is proposed to achieve perfect sound absorption at low frequencies, which are generated around the resonance mode. The average surface acoustic impedance of the metamaterial is almost perfectly matched with water impedance under the action of resonance among the HRs, thus the perfect sound absorption is achieved. The case of two resonators is taken as an example to verify the design idea. By adjusting HRs’ sizes in simulation, the sound absorption coefficient reaches 99.6% at low frequency of 2740 Hz with ultra-thin thickness less than [Formula: see text]. The abnormal physical properties of AMs are often accompanied by abnormal effective material parameters, which turn to be negative near the perfect sound absorption through inversion calculation. The HRs proposed are simple to fabricate, mechanically stable, and convenient to couple with other resonators to achieve low-frequency broadband sound absorption.
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