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Research Papers

A Metamaterial Acoustic Concentrator With Regular Polygonal Cross Section

[+] Author and Article Information
Jingjing Yang, Chengfu Yang, Guanghui Cai

School of Information Science and Engineering,  Yunnan University, Kunming 650091, PR China

Ming Huang1

School of Information Science and Engineering,  Yunnan University, Kunming 650091, PR Chinahuangming@ynu.edu.cn

1

Corresponding author.

J. Vib. Acoust 133(6), 061016 (Nov 28, 2011) (4 pages) doi:10.1115/1.4004678 History: Received July 03, 2010; Revised April 11, 2011; Published November 28, 2011; Online November 28, 2011

The phenomenon of near-field concentration of sound wave plays an important role in harnessing of sound wave in underwater sonar or similar devices, where high pressure field is required. Material parameters for the metamaterial-assisted acoustic concentrators with arbitrary N-sided regular polygonal cross section are derived based on coordination transformation approach. Acoustic intensity enhancement of the concentrator has been shown by full-wave simulation. All theoretical and numerical results validate the generality and effectiveness of the proposed designing method.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 4

(a) and (b) show the pressure fields distribution in the computational domain for a five-sided acoustic concentrator. The line source is located at (−0.65 m, 0) and (−0.55 m, 0.55 m) for (a) and (b), respectively. (c) and (d) are the corresponding acoustic intensity distributions.

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Figure 5

Pressure fields distribution in the vicinity of the (a) three- and (b) four-sided acoustic concentrators, which are rotated by an angle of θ0=π/6 and θ0=π/8, respectively; (c) and (d) are the corresponding acoustic intensity distributions

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Figure 6

(a) Pressure fields distribution in the vicinity of the concentrator with arbitrary geometries; (b) is the corresponding acoustic intensity distribution of (a)

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Figure 7

(a) Pressure fields distribution in the computational domain, where two arbitrary shaped concentrators are placed in close proximity; (b) is the corresponding acoustic intensity distribution of (a)

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Figure 3

Normalized acoustic intensity distribution along the x axis of a five-sided acoustic concentrator for different values of parameter (a) a and (b) b. All profiles are normalized against the initial value of acoustic intensity.

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Figure 2

Pressure fields distribution in the computational domain for the (a) five- and (b) six-sided acoustic concentrators under acoustic plane wave irradiation; (c) and (d) are the corresponding acoustic intensity distribution

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Figure 1

Schematic diagram of space transformation for the acoustic concentrator with N-sided regular polygonal cross section

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