Tunable acoustic radiation pattern assisted by effective impedance boundary Project supported by the National Basic Research Program of China (Grant Nos. 2012CB921504 and 2011CB707902), the National Natural Science Foundation of China (Grant No.11474160), the Fundamental Research Funds for Central Universities, China (Grant No. 020414380001), the State Key Laboratory of Acoustics, Chinese Academy of Sciences (Grant No. SKLOA201401), the Priority Academic Program Development of Jiangsu Higher Edu

The acoustic wave propagation from a two-dimensional subwavelength slit surrounded by metal plates decorated with Helmholtz resonators (HRs) is investigated both numerically and experimentally in this work. Owing to the presence of HRs, the effective impedance of metal surface boundary can be manipu...

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Bibliographic Details
Published in:Chinese physics B 2015-12, Vol.25 (2)
Main Authors: Qian, Feng, Quan, Li, Wang, Li-Wei, Liu, Xiao-Zhou, Gong, Xiu-Fen
Format: Article
Language:English
Subjects:
acoustic radiation pattern
effective impedance boundary
Helmholtz resonator
Online Access:Get full text
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Summary:The acoustic wave propagation from a two-dimensional subwavelength slit surrounded by metal plates decorated with Helmholtz resonators (HRs) is investigated both numerically and experimentally in this work. Owing to the presence of HRs, the effective impedance of metal surface boundary can be manipulated. By optimizing the distribution of HRs, the asymmetric effective impedance boundary will be obtained, which contributes to generating tunable acoustic radiation pattern such as directional acoustic beaming. These dipole-like radiation patterns have high radiation efficiency, no fingerprint of sidelobes, and a wide tunable range of the radiation pattern directivity angle which can be steered by the spatial displacements of HRs.
ISSN:1674-1056
DOI:10.1088/1674-1056/25/2/024301