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Homogeneous and compact acoustic ground cloaks

Publication ,  Journal Article
Popa, BI; Cummer, SA
Published in: Physical Review B - Condensed Matter and Materials Physics
June 24, 2011

We present the design, architecture, and detailed performance predictions for a class of ground-plane acoustic cloaking shells. The design begins with a coordinate transformation which, in contrast to a quasiconformal design, yields a homogeneous but anisotropic material and a shell size that is comparable to the size of the object to be hidden. We apply the general approach to the design of a broadband acoustic cloak in water, in which the desired material parameters are realized through acoustic metamaterials composed of blocks of steel, aluminum foam, and silicon carbide foam. Since metallic and ceramic foams are prone to sound absorption, we discuss the effects of loss inside the two types of foam. An important part of this design consists in reducing the shear wave effects inside the solids by isolating these solids from each other through narrow channels of background fluid. Numerical simulations of the entire device, as composed of the discrete and basic material building blocks, demonstrates good performance and shows that such a device can be physically realized through the assembly of available materials in a relatively simple form. © 2011 American Physical Society.

Duke Scholars

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

June 24, 2011

Volume

83

Issue

22

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

Citation

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Popa, B. I., & Cummer, S. A. (2011). Homogeneous and compact acoustic ground cloaks. Physical Review B - Condensed Matter and Materials Physics, 83(22). https://doi.org/10.1103/PhysRevB.83.224304
Popa, B. I., and S. A. Cummer. “Homogeneous and compact acoustic ground cloaks.” Physical Review B - Condensed Matter and Materials Physics 83, no. 22 (June 24, 2011). https://doi.org/10.1103/PhysRevB.83.224304.
Popa BI, Cummer SA. Homogeneous and compact acoustic ground cloaks. Physical Review B - Condensed Matter and Materials Physics. 2011 Jun 24;83(22).
Popa, B. I., and S. A. Cummer. “Homogeneous and compact acoustic ground cloaks.” Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 22, June 2011. Scopus, doi:10.1103/PhysRevB.83.224304.
Popa BI, Cummer SA. Homogeneous and compact acoustic ground cloaks. Physical Review B - Condensed Matter and Materials Physics. 2011 Jun 24;83(22).

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

June 24, 2011

Volume

83

Issue

22

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences