Compact broadband acoustic sink with coherently coupled weak resonances

作     者：Sibo Huang Zhiling Zhou Dongting Li Tuo Liu Xu Wang Jie Zhu Yong Li 黄思博;周志凌;李东庭;刘拓;王旭;祝捷;李勇

作者机构：Institute of AcousticsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Mechanical EngineeringThe Hong Kong Polytechnic UniversityHong KongChina 

基　　金：supported by the National Natural Science Foundation of China(11704284 and 11774265) the Young Elite Scientists Sponsorship by CAST(2018QNRC001) the Shanghai Science and Technology Committee(18JC1410900) the Shanghai Pujiang Program(17PJ1409000) the Stable Supporting Fund of Acoustic Science and Technology Laboratory 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2020年第65卷第5期

页      码：373-379页

摘      要：Broadband sound sink/absorber via a structure with deep sub-wavelength thickness is of great and continuing interest in physics and engineering *** intuitive technique extensively used is to combine components(resonators)with quasi-perfect absorption to piece together a broad absorbing band,but the requirement of quasi-perfect absorption substantially places a very strict restriction on the impedance and thickness of the ***,we theoretically and experimentally demonstrate that a compact broadband acoustic sink that quasi-perfectly absorbs broadband arriving sound waves can be achieved with coherently coupled‘‘weak resonances"(resonant sound absorbing systems with low absorption peaks).Although each component exhibits rather low absorption peak alone,via manipulating the coherent coupling effect among the components,they collectively provide a remarkably improved performance over a wide frequency range with a significantly compressed *** illustrate the design principle,a hybrid metasurface utilizing the coaction of parallel and cascade couplings is presented,which possesses an average absorption coefficient of 0.957 in the quasi-perfect band(a>0:9)from 870 to 3224 Hz with a thickness of only 3.9 *** results open new avenues for the development of novel and highly efficient acoustic absorbers against low frequency noise,and more essentially,suggest an efficient approach towards on-demand acoustic impedance engineering in broadband.

主 题 词：Broadband acoustic sink Acoustic metasurface Coherent coupling Imperfect components 

学科分类：12[管理学] 083002[083002] 1204[管理学-公共管理类] 0830[工学-生物工程类] 120402[120402] 08[工学] 0837[0837] 

核心收录：

D　O　I：10.1016/j.scib.2019.11.008

馆 藏 号：203881023...