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Applied Physics Letters / Volume 99 / Issue 7 / INTERDISCIPLINARY AND GENERAL PHYSICS

Appl. Phys. Lett. 99, 074102 (2011); http://dx.doi.org/10.1063/1.3623761 (3 pages)

Acoustic cloak for airborne sound by inverse design

V. M. García-Chocano1, L. Sanchis2, A. Díaz-Rubio1, J. Martínez-Pastor2, F. Cervera1, R. Llopis-Pontiveros2, and J. Sánchez-Dehesa1

1Grupo de Fenómenos Ondulatorios, Universitat Politècnica de València, Camino de Vera s.n. (Edificio 7F), ES-46022 Valencia, Spain
2UMDO (Unidad Asociada al CSIC-IMM), Instituto de Ciencia de Materiales, Universidad de Valencia, P.O. Box 22085, 46071 Valencia, Spain

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(Received 8 May 2011; accepted 19 July 2011; published online 16 August 2011)

This Letter presents practical realization of a two-dimensional low loss acoustic cloak for airborne sound obtained by inverse design. The cloak consists of 120 aluminum cylinders of 15 mm diameter surrounding the cloaked object—a cylinder of diameter 22.5 cm. The position of each cylinder in the cloak is optimized using the data from two different techniques: genetic algorithm and simulated annealing. The operation frequency of this cloak is 3061 Hz with the bandwidth of about 100 Hz. Being a multi-step approach to the desired cloaking, the inverse design is also valid, in principle, for non-symmetric cylinders and even for three-dimensional objects.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

acoustic materials, acoustic wave propagation, aeroacoustics, genetic algorithms, metamaterials, physics computing, simulated annealing

PACS

  • 43.28.-g

    Aeroacoustics and atmospheric sound

  • 02.60.Pn

    Numerical optimization

  • 43.20.El

    Reflection, refraction, diffraction of acoustic waves

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3623761

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

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