亥姆霍兹谐振器
谐振器
声学
螺旋(铁路)
材料科学
亥姆霍兹自由能
声音(地理)
共面波导
光电子学
电阻抗
共振(粒子物理)
物理
超材料
工程类
电信
机械工程
量子力学
微波食品加热
作者
Xiaobing Cai,Qiuquan Guo,Gengkai Hu,Jun Yang
摘要
Performance of classic sound absorbing materials strictly depends on their thickness, with a minimum of one-quarter wavelength to reach full sound absorption. In this paper, we report ultrathin sound absorbing panels that completely absorb sound energy with a thickness around one percent of wavelength. The strategy is to bend and coil up quarter-wavelength sound damping tubes into 2D coplanar ones, and embed them into a matrix to form sound absorbing panel. Samples have been designed and fabricated by 3D printing. Efficacies of sound absorption by these panels were validated through good agreement between theoretical analysis and experimental measurements.
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