Theoretical Analogies between (Generalized) Lamb and Rayleigh Waves on Insonified, Submerged, Elastic, Hollow and Solid Curved Bodies

Abstract

We analyze resonance features in the backscattering cross-sections (BSCS) of an air-filled steel spherical shell submerged in water and insonified by a plane c.w. sound wave. We generalize the concepts of Raleigh (R), whispering gallery (WG), and Lamb waves in half spaces and plates in vacuo to curved solid and hollow bodies immersed in fluids. We study how each shell-wave manifests itself in the various waves in wide bands, and compare Lamb and R/WG waves as the shell becomes a solid sphere to extract their similarities. The fluid-loadings, the shell thickness, and the curvatures of the body generate novel waves in the shell and its BSCS that could have never emerged from earlier models that ignored these effects and which we analyze here.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1990
Accession Number
ADA237977

Entities

People

  • Guillermo C. Gaunaurd
  • Michael F. Werby

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waves
  • Acoustics
  • Diffraction
  • Films
  • Frequency
  • Frequency Bands
  • Phase Velocity
  • Rayleigh Waves
  • Resonance
  • Resonators
  • Shell Scripts
  • Sound Waves
  • Surface Acoustic Wave Devices
  • Surface Acoustic Waves
  • Surface Waves
  • Wave Propagation

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Fluid Dynamics.
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Space