Matryoshka locally resonant sonic crystal
journal contributionposted on 2014-06-17, 10:35 authored by Daniel Elford, Luke Chalmers, Feodor Kusmartsev, Gerry Swallowe
The results of numerical modeling of sonic crystals with resonant array elements are reported. The investigated resonant elements include plain slotted cylinders as well as their various combinations, in particular, Russian doll or Matryoshka configurations. The acoustic band structure and transmission characteristics of such systems have been computed with the use of finite element methods. The general concept of a locally resonant sonic crystal is proposed that utilizes acoustic resonances to form additional band gaps that are decoupled from Bragg gaps. An existence of a separate attenuation mechanism associated with the resonant elements that increases performance in the lower frequency regime has been identified. The results show a formation of broad band gaps positioned significantly below the first Bragg frequency. For low frequency broadband attenuation, a most optimal configuration is the Matryoshka sonic crystal, where each scattering unit is composed of multiple concentric slotted cylinders. This system forms numerous gaps in the lower frequency regime, below Bragg bands, while maintaining a reduced crystal size viable for noise barrier technology. The finding opens alternative perspectives for the construction of sound barriers in the low frequency range usually inaccessible by traditional means including conventional sonic crystals.
Published inJOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Pages2746 - 2755 (10)
CitationELFORD, D.P. ... et al, 2011. Matryoshka locally resonant sonic crystal. Journal of the Acoustical Society of America, 130 (5), pp. 2746 - 2755.
Publisher© Acoustical Society of America
- VoR (Version of Record)
NotesCopyright 2012 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in Journal of the Acoustical Society of America, 2011, 130 (5), pp. 2746 - 2755 and may be found at http://dx.doi.org/10.1121/1.3643818