Broadband acoustic concentrator with multilayered alternative homogeneous materials

Wang, Yu-ran; Zhang, Hui; Zhang, Shuyi; Li, Fan; Sun, Hong-xiang

doi:10.1121/1.3679004

Cited by 20 publications

(14 citation statements)

References 15 publications

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“…As can be seen from Fig.5, different shape concentrators are achieved without changing the materials of Eq. (6) and their results exhibit strong agreement with their previous counterparts which were achieved by performing tedious calculations [12][13][14][15].…”

Section:  supporting

confidence: 84%

Arbitrary Shaped Acoustic Concentrators Enabled by Null Media

2020

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Based on the transformation acoustic (TA) methodology, an innovative approach for designing arbitrary shape concentrators is proposed. Unlike previous works, which utilized inhomogeneous and anisotropic materials to localize the incident acoustic waves in an arbitrary domain, the same functionality will be attained by introducing only one homogeneous anisotropic medium, which is called Acoustic nihility media (ANM). A great advantage of this method is that the attained materials are not dependent on the shape of the concentrator. That is regardless of the device geometry, a constant ANM will be used for each new shape and the output results do not alter. This will circumvent the conventional transformation acoustics' sophisticated and tedious calculations and could be easily implemented in real-life scenarios.

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Section:  supporting

confidence: 84%

Arbitrary Shaped Acoustic Concentrators Enabled by Null Media

2020

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“…The process can also be reversed: one can place a source at the focus and convert a cylindrical wavefront generated by a point source into a plane wavefront. Similar work on designing acoustic concentrators using transformation acoustics has been recently reported in Wang et al 16 Previously, Rahm et al 17 reported the design of electromagnetic concentrators.…”

Section: B Transformations Yielding Power Law Radial Stiffness K Rmentioning

confidence: 73%

Special transformations for pentamode acoustic cloaking

Gokhale

Cipolla

Norris

2012

The Journal of the Acoustical Society of America

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The acoustic cloaking theory of Norris [Proc. R. Soc. London, Ser. A 464, 2411-2434 (2008)] permits considerable freedom in choosing the transformation f from physical to virtual space. The standard process for defining cloak materials is to first define f and then evaluate whether the materials are practically realizable. In this paper, this process is inverted by defining desirable material properties and then deriving the appropriate transformations which guarantee the cloaking effect. Transformations are derived which result in acoustic cloaks with special properties such as (1) constant density, (2) constant radial stiffness, (3) constant tangential stiffness, (4) power-law density, (5) power-law radial stiffness, (6) power-law tangential stiffness, and (7) minimal elastic anisotropy.

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“…2 a straight lines and dotted lines. This characteristic is the main difference comparing to the previous Wang’s design 23 which used normal transformation method. The density tensor and bulk modulus for the Ref.…”

Section: Methodsmentioning

confidence: 80%

“…And by applying acrylonitrile butadiene styrene plastic structure, they constructed it physically. Then, more researches about acoustic concentrators 22 , 23 and rotators 21 , 24 , 25 emerged, that can magnify the intensity or rotate the propagation direction of the acoustic wave in the internal region and keep external field unchanged. However, the physical realization of the acoustic concentrators and rotators suffers from complicated parameters, especially inhomogeneity, making it difficult for experimental realization.…”

Section: Introductionmentioning

confidence: 99%

Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

Wang

Zhang

Shah

et al. 2021

Sci Rep

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With the ability to focus and rotate the acoustic field in a given region while keeping the outside region unchanged, the acoustic concentrator and rotator has been developed for the versatile manipulations of acoustic wave. In this letter, we report the design of acoustic concentrator and rotator facilitated by linear coordinate transformation. Compared with the previous ones that have inhomogeneous parameter distributions, the designed devices are composed of several parts with homogeneous parameters, which can be achieved with the help of few homogeneous layered structures. Simulations are also performed to verify the functions of the designed device. The proposed acoustic concentrators and rotators would be useful in numerous applications such as acoustic sensing and communication.

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Broadband acoustic concentrator with multilayered alternative homogeneous materials

Cited by 20 publications

References 15 publications

Arbitrary Shaped Acoustic Concentrators Enabled by Null Media

Arbitrary Shaped Acoustic Concentrators Enabled by Null Media

Special transformations for pentamode acoustic cloaking

Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

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