DOI: 10.1016/j.scib.2019.11.008
论文题名: Compact broadband acoustic sink with coherently coupled weak resonances
作者: Huang S. ; Zhou Z. ; Li D. ; Liu T. ; Wang X. ; Zhu J. ; Li Y.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 5 起始页码: 373
结束页码: 379
语种: 英语
中文关键词: Acoustic metasurface
; Broadband acoustic sink
; Coherent coupling
; Imperfect components
英文关键词: Acoustic impedance
; Acoustic wave absorption
; Average absorption coefficients
; Broadband acoustic sink
; Coherent coupling
; Engineering community
; Imperfect components
; Low-Frequency Noise
; Metasurface
; Wide frequency range
; Acoustics
英文摘要: Broadband sound sink/absorber via a structure with deep sub-wavelength thickness is of great and continuing interest in physics and engineering communities. An 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 components. Here, 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 thickness. To 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 (α>0.9) from 870 to 3224 Hz with a thickness of only 3.9 cm. Our 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. © 2019 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169923
Appears in Collections: 气候变化与战略
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作者单位: Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China; Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong
Recommended Citation:
Huang S.,Zhou Z.,Li D.,et al. Compact broadband acoustic sink with coherently coupled weak resonances[J]. Science Bulletin,2020-01-01,65(5)