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Chin. Phys. B, 2013, Vol. 22(7): 074302    DOI: 10.1088/1674-1056/22/7/074302
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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

Yuan Bo, Wen Ji-Hong, Wen Xi-Sen
Vibration and Acoustics Research Group, Laboratory of Science and Technology on Integrated Logistics Support,National University of Defense Technology, Changsha, 410073, China; MOE Key Laboratory of Photonic and Phononic Crystals, National University of Defense Technology, Changsha, 410073, China
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      Published:  01 June 2013
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, Wen Ji-Hong, Wen Xi-Sen Oblique incidence properties of locally resonant sonic materials with resonance and Bragg scattering effects 2013 Chin. Phys. B 22 074302

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