气候变化领域集成服务门户(CCPortal): Compact broadband acoustic sink with coherently coupled weak resonances

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DOI	10.1016/j.scib.2019.11.008
	Compact broadband acoustic sink with coherently coupled weak resonances
	Huang S.; Zhou Z.; Li D.; Liu T.; Wang X.; Zhu J.; Li Y.
发表日期	2020
ISSN	20959273
起始页码	373
结束页码	379
卷号	65 期号:5
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
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
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207067
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
推荐引用方式 GB/T 7714	Huang S.,Zhou Z.,Li D.,et al. Compact broadband acoustic sink with coherently coupled weak resonances[J],2020,65(5).
APA	Huang S..,Zhou Z..,Li D..,Liu T..,Wang X..,...&Li Y..(2020).Compact broadband acoustic sink with coherently coupled weak resonances.Science Bulletin,65(5).
MLA	Huang S.,et al."Compact broadband acoustic sink with coherently coupled weak resonances".Science Bulletin 65.5(2020).