Acoustic skin meta-muffler  

作　　者：Yong-Xin Gao Yi Cheng Bin Liang Yong Li Jing Yang Jian-Chun Cheng 

机构地区：[1]Key Laboratory of Modern Acoustics,Ministry of Education,Institute of Acoustics,Department of Physics,Nanjing University,Nanjing 210093,China [2]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [3]Institute of Acoustics,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2021年第9期87-92,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：the National Key R&D Program of China(Grant No.2017YFA0303700);the National Natural Science Foundation of China(Grant Nos.11634006,11374157,81127901,and 12074286);the High-Performance Computing Center of Collaborative Innovation Center of Advanced Microstructures.

摘　　要：The effective elimination of sound energy traveling in open ducts is critical in acoustics,with considerable potential in diverse applications ranging from duct noise control to exhaust system design.However,previous absorber mechanisms are bulky or have limited ventilation or unsatisfactory absorption capability.We propose and experimentally demonstrate the concept of meta-mufflers capable of quasi-perfectly absorbing airborne sound propagating in an open duct while minimizing the influence on airflow because of its vanishing thickness.The mechanism uses coupling among asymmetric metasurfaces to achieve impedance match and subsequent high absorption in a subwavelength scale,which is explained analytically and validated experimentally.The proposed meta-muffler features an uncomplicated design,high attenuation efficiency,and a thickness of nearly two orders of magnitude of wavelength,ensuring the free pass of other entities.Furthermore,our design offers the flexibility of tuning and extending working bandwidth by hybridization of weak resonances.The performance of the proposed muffler is verified via experiments,which correlate excellently with theoretical predictions.The realization of meta-mufflers opens a route to novel acoustic absorbers and could have far-reaching implications in a plethora of important scenarios calling for both perfect sound absorption and open acoustic paths.

关 键 词：acoustic metamaterial ultrathin sound absorber coupling effect broadband high absorption 

分 类 号：TN64[电子电信—电路与系统]