Accession Number:

ADA275601

Title:

Determination of the Complex Mass Density of Air Contained in a Rigid Porous Solid by an Acoustic Method

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1993-09-01

Pagination or Media Count:

76.0

Abstract:

An acoustical method for determining the frequency dependent complex effective mass density peff of air contained in a rigid porous solid is investigated. An apparatus was designed and built which holds an air-filled porous solid sample within a cylindrical tube capped on each end by identical moving-coil loudspeakers. A quantity of air is made to oscillate back and forth as a plug through the porous solid sample. Peff is obtained from pressure and acceleration measurements taken at the ends of the sample tube. A description of the apparatus and the experimental results are presented. Rigid porous solid, Complex effective mass density, Effective fluid mass density, Flow resistance.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE