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Related Experiment Videos

Leaky helical flexural wave backscattering contributions from tilted water-filled cylindrical shells.

Florian J Blonigen1, Philip L Marston

  • 1Department of Physics, Washington State University, Pullman, Washington 99164-2814, USA.

The Journal of the Acoustical Society of America
|February 1, 2003
PubMed
Summary

Helical flexural waves in water-filled steel shells significantly contribute to backscattering above coincidence frequency. Internal water dampens waves for short bursts but enhances scattering with longer bursts due to internal ray excitation.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Materials Science

Background:

  • Understanding acoustic wave propagation in submerged structures is crucial.
  • Cylindrical shells are common in marine and industrial applications.
  • The influence of internal fluid on shell acoustics is complex.

Purpose of the Study:

  • To investigate helical flexural wave contributions to backscattering from water-filled steel shells.
  • To analyze the effect of internal water on wave damping and scattering mechanisms.
  • To adapt existing models for analyzing scattering from fluid-filled shells.

Main Methods:

  • Modified ray analysis based on models for empty shells.
  • Analysis of acoustic backscattering from bluntly truncated tilted cylindrical shells.

Related Experiment Videos

  • Experimental or simulation-based investigation of wave propagation and damping using tone bursts of varying lengths.

    • Main Results:

    • Helical flexural waves significantly contribute to backscattering above the coincidence frequency.
    • Internal water increases leaky wave damping for short tone bursts.
    • Longer tone bursts show superposition of internally radiated energy onto helical ray backscattering.

    Conclusions:

    • The presence of internal water modifies the acoustic scattering characteristics of cylindrical shells.
    • Ray analysis provides a viable method for predicting scattering from fluid-filled shells.
    • Internal wave excitation plays a key role in the observed scattering phenomena.