Sound Speed and Attenuation in Multiphase Media

Abstract

The current research goal is the development of a quantitative understanding and a theoretical treatment of the scattering of sound by non-spherical compressible objects (microbubbles) in multiphase media in the 1-10kHz region. The second research goal was to explain the observed nonlinear power law frequency-dependent attenuation at lower frequencies ( less than or equal to 1 kHz ) Biot (1956) [1], Burridge and Keller(1981) [2], and Stoll(1989) [3] predicted that the sandy-sediment frequency-dependent attenuation should be quadratic; however the observed dependence was less than quadratic. The goal was development of a simplified theory of sediment attenuation verified by measurements that could explain this dependence and be applied to ocean sediments.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2009
Accession Number
ADA523456

Entities

People

  • William M. Carey

Organizations

  • Boston University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Waves
  • Attenuation
  • Bottom Loss
  • Crystal Lattice Vibrations
  • Displacement
  • Energy Conversion
  • Engineering
  • Frequency
  • Losses
  • Mechanical Engineering
  • Scattering
  • Secondary Waves
  • Sediments
  • Shallow Water
  • Transmission Loss
  • Water
  • Waves

Readers

  • Acoustical Oceanography.
  • Fluid Dynamics.
  • Wave Propagation and Nonlinear Chaotic Dynamics.