Three-dimensional broadband omnidirectional acoustic ground cloak.

Zigoneanu, Lucian

Popa, Bogdan-Ioan

Cummer, Steven A

England

2014-03-17T16:01:08Z

2014-04

The control of sound propagation and reflection has always been the goal of engineers involved in the design of acoustic systems. A recent design approach based on coordinate transformations, which is applicable to many physical systems, together with the development of a new class of engineered materials called metamaterials, has opened the road to the unconstrained control of sound. However, the ideal material parameters prescribed by this methodology are complex and challenging to obtain experimentally, even using metamaterial design approaches. Not surprisingly, experimental demonstration of devices obtained using transformation acoustics is difficult, and has been implemented only in two-dimensional configurations. Here, we demonstrate the design and experimental characterization of an almost perfect three-dimensional, broadband, and, most importantly, omnidirectional acoustic device that renders a region of space three wavelengths in diameter invisible to sound.

http://www.ncbi.nlm.nih.gov/pubmed/24608143

nmat3901

1476-1122

https://hdl.handle.net/10161/8401

eng

Springer Science and Business Media LLC

Nat Mater

10.1038/nmat3901

Three-dimensional broadband omnidirectional acoustic ground cloak.

Journal article

http://www.ncbi.nlm.nih.gov/pubmed/24608143

352

355

4

Duke

Electrical and Computer Engineering

Pratt School of Engineering

Published

13