Oblique incidence properties of locally resonant sonic materials with resonance and Bragg scattering effects

doi:10.1088/1674-1056/22/7/074302

Abstract A locally resonant sonic material (LRSM) is an elastic matrix containing a periodic arrangement of identical local resonators (LRs), which can reflect strongly near their natural frequencies, where the wavelength in the matrix is still much larger than the structural periodicity. Due to the periodic arrangement, an LRSM can also display a Bragg scattering effect, which is a characteristic of phononic crystals. A specific LRSM which possesses both local resonance and Bragg scattering effects is presented. Via the layered-multiple-scattering theory, the complex band structure and the transmittance of such LRSM are discussed in detail. Through the analysis of the refraction behavior at the boundary of the composite, we find that the transmittance performance of an LRSM for oblique incidence depends on the refraction of its boundary and the transmission behaviors of different wave modes inside the composite. As a result, it is better to use some low-speed materials (compared with the speed of waves in surrounding medium) as the matrix of LRSM for designing sound blocking materials in underwater applications, since their acoustic properties are more robust to the incident angle. Finally, a gap-coupled LRSM with a broad sub-wavelength transmission gap is studied, whose acoustic performance is insensitive to the angle of incidence.

Keywords: underwater acoustic materials oblique incidence locally resonant sonic materials Bragg scattering

Received: 21 September 2012
Revised: 30 October 2012
Accepted manuscript online:

PACS:	43.35.+d	(Ultrasonics, quantum acoustics, and physical effects of sound)
	43.30.+m	(Underwater sound)
	43.20.+g	(General linear acoustics)
	43.40.+s	(Structural acoustics and vibration)

Corresponding Authors: Wen Xi-Sen
E-mail: wenxs@vip.sina.com

Cite this article:

Yuan Bo (袁博), Wen Ji-Hong (温激鸿), Wen Xi-Sen (温熙森) Oblique incidence properties of locally resonant sonic materials with resonance and Bragg scattering effects 2013 Chin. Phys. B 22 074302

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Oblique incidence properties of locally resonant sonic materials with resonance and Bragg scattering effects

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