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

Abstract

An acoustical method for determining the frequency dependent complex effective mass density p(eff) 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. P(eff) 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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1993
Accession Number
ADA275601

Entities

People

  • Kevin A. Grundy

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustic Properties
  • Acoustic Waves
  • Acoustics
  • Classification
  • Differential Equations
  • Doppler Effect
  • Elastic Waves
  • Equations
  • Frequency
  • Frequency Bands
  • Loudspeakers
  • Measurement
  • Pressure Distribution
  • Pressure Measurement
  • Resistance
  • Schools
  • Security

Readers

  • Electrical Engineering
  • Fluid Dynamics.
  • Superconducting Magnet Technology