Circumferential resonance modes of solid elastic cylinders excited by obliquely incident acoustic waves

  • Fan Y
  • Honarvar F
  • Sinclair A
 et al. 
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Abstract

When an immersed solid elastic cylinder is insonified by an obliquely incident plane acoustic wave, some of the resonance modes of the cylinder are excited. These modes are directly related to the incidence angle of the insonifying wave. In this paper, the circumferential resonance modes of such immersed elastic cylinders are studied over a large range of incidence angles and frequencies and physical explanations are presented for singular features of the frequency-incidence angle plots. These features include the pairing of one axially guided mode with each transverse whispering gallery mode, the appearance of an anomalous pseudo-Rayleigh in the cylinder at incidence angles greater than the Rayleigh angle, and distortional effects of the longitudinal whispering gallery modes on the entire resonance spectrum of the cylinder. The physical explanations are derived from Resonance Scattering Theory ͑RST͒, which is employed to determine the interior displacement field of the cylinder and its dependence on insonification angle.

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Authors

  • Ying Fan

  • Farhang Honarvar

  • Anthony N. Sinclair

  • Mohammad-Reza Jafari

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