Sonic composites as noise barriers

Authors

  • Ligia Munteanu Institute of Solid Mechanics, Romanian Academy, Bucharest, Romania
  • Veturia Chiroiu Institute of Solid Mechanics, Romanian Academy, Bucharest, Romania
  • Ciprian Dragne Institute of Solid Mechanics, Romanian Academy, Bucharest, Romania
  • Valeria Mosnegutu Institute of Solid Mechanics, Romanian Academy, Bucharest, Romania
  • Nicolae Nedelcu Institute of Solid Mechanics, Romanian Academy, Bucharest, Romania
  • Iulian Grip Institute of Solid Mechanics, Romanian Academy, Bucharest, Romania
  • Cristian Rugina Institute of Solid Mechanics, Romanian Academy, Bucharest, Romania

Keywords:

Sonic composite, Band-gaps, Multiple resonances, Noise barrier

Abstract

We address an alternative road traffic noise barrier as a sonic composite consisted of an array of acoustic scatterers embedded in air. Acoustic scatterers are piezoceramic hollow spheres of functionally graded materials - the Reddy graded hollow spheres. Multiple (Bragg) scattering lead to a selective sound attenuation in the frequency bands called band gaps or stop bands for certain spacing and size of the scatterers. Size variations of the band gaps are discussed in this paper by taking into account the intrinsic acoustic properties of the scatterers. We reveal that the noise barrier simulation in the context of the road traffic noise confirm the Bragg band gaps existence and the predicted multiple resonances at frequencies below the first Bragg band gap.

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Published

2020-07-30

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