摘要
Broadband absorption of low-frequency sound waves via a deep subwavelength structure is of great and ongoing interest in research and engineering.Here,we numerically and experimentally present a design of a broadband lowfrequency absorber based on an acoustic metaporous composite(AMC).The AMC absorber is constructed by embedding a single metamaterial resonator into a porous layer.The finite element simulations show that a high absorption(absorptance A>0.8)can be achieved within a broad frequency range(from 290 Hz to 1074 Hz),while the thickness of AMC is 1/13of the corresponding wavelength at 290 Hz.The broadband and high-efficiency performances of the absorber are attributed to the coupling between the two resonant absorptions and the trapped mode.The numerical simulations and experimental results are obtained to be in good agreement with each other.Moreover,the high broadband absorption can be maintained under random incident acoustic waves.The proposed absorber provides potential applications in low-frequency noise reduction especially when limited space is demanded.
作者
Jia-Hao Xu
Xing-Feng Zhu
Di-Chao Chen
QiWei
Da-JianWu
徐家豪;朱兴凤;陈帝超;魏琦;吴大建(Jiangsu Key Laboratory on Opto-Electronic Technology,School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China;Key Laboratory of Modern Acoustics,School of Physics,Nanjing University,Nanjing 210093,China)
基金
supported by the National Natural Science Foundation of China(Grant Nos.12174197,11874222,and 12027808)。
作者简介
Corresponding author:朱兴凤.E-mail:zhuxingfeng@njnu.edu.cn;Corresponding author:吴大建.E-mail:wudajian@njnu.edu.cn。
