Accession Number:

ADA523456

Title:

Sound Speed and Attenuation in Multiphase Media

Descriptive Note:

Research rept.

Corporate Author:

BOSTON UNIV MA DEPT OF AEROSPACE AND MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2009-01-01

Pagination or Media Count:

7.0

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 Keller1981 2, and Stoll1989 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.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustic Detection and Detectors
  • Acoustics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE