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Journal of the Acoustical Society of America / Volume 131 / Issue 2 / JASA EXPRESS LETTERS

Broadband acoustic concentrator with multilayered alternative homogeneous materials

J. Acoust. Soc. Am. Volume 131, Issue 2, pp. EL150-EL155 (2012); (6 pages)

Yu-ran Wang, Hui Zhang, Shu-yi Zhang, Li Fan, and Hong-xiang Sun

Lab of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, People’s Republic of China wangxx1986@gmail.com, paslabw@nju.edu.cn, zhangsy@nju.edu.cn, tx_fanli@sina.com.cn, jsdxshx@ujs.edu.cn

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A two-dimensional cylindrical acoustic concentrator is designed with multilayered alternative homogeneous materials, which can focus acoustic field and enhance acoustic energy in a given area. The frequency response analysis of the acoustic concentrator demonstrates that the acoustic energy can be concentrated within the device over a wide frequency band. Meanwhile, there are contradictory relations between the acoustic concentrating performances in the inner region and the scattering properties in the outer region of these concentrators. When the contradictory relations satisfy compromise balance, the concentration ratio can reach at least 70%.

© 2012 Acoustical Society of America

Acknowledgment

This work was supported by the National Basic Research Program of China (Grant No. 2012CB921504), National Natural Science Foundation of China (Grants No. 11004099 and No. 11174142), and the State Key Laboratory of Acoustics of Chinese Academy of Sciences.

Article Outline

  1. Introduction
  2. Theory of 2D cylindrical acoustic concentrator
  3. Full-wave simulations and results
    1. Scattering property
    2. Concentrating performance
  4. Conclusions

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KEYWORDS and PACS

Keywords

acoustic devices, acoustic focusing, acoustic wave scattering, frequency response, multilayers

PACS

ARTICLE DATA

History
Received 17 Oct 2011
Accepted 30 Dec 2011
Published online 26 Jan 2012
Digital Object Identifier
http://dx.doi.org/10.1121/1.3679004

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

$abstract.society.value is a Member of CrossRef Acoustical Society of America

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Figures (click on thumbnails to view enlargements)

FIG.1
(a) Sketch of cylindrical acoustic concentrator; (b) schematic of layered acoustic system.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
(Color online) Acoustic pressure field distribution for incident wave from a plane source at ka = 9.5, in which (a1), (b1), and (c1) are corresponding to concentrators having 80, 140, and 200 layer shells, respectively. Normalized instantaneous acoustic intensity distribution (a2), (b2), and (c2) are corresponding to above figures, respectively. Far-field scattering form factors (d) obtained with five other cases: rigid scatterer and concentrators having 20, 80, 140, and 200 layer shells, respectively.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
(Color online) Acoustic pressure field distribution at ka = 9.5, in which (a1), (b1), and (c1) are corresponding to R2 having 1.5R1, 2.5R1, and 3.5R1, and (a2), (b2), and (c2) are corresponding to normalized instantaneous acoustic intensity distributions, respectively. (d) Total scattering cross-section and concentration ratio of the acoustic concentrator for different frequencies up to ka = 10 with 200 layers shell and R2 = 2R1.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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