Development of a Compact Apparatus for Determining Complex Parameters of Fluid-Filled Porous Solids by Impedance Techniques

Abstract

A method for determining the complex bulk modulus B and the complex mass density rho of a fluid contained in a rigid porous solid is investigated. The fluid filled solid is contained within a small cylindrical cavity capped on each end by identical transducers. This method, suitable for an acoustically 'soft' transducer, is based upon electroacoustic network theory. B and rho are obtained from the input electrical impedance of each transducer when they are wired in parallel 'in-phase' and 'out-of-phase' , respectively. A description of the apparatus and preliminary experimental results are presented. Keywords include: Theses, Bulk modulus, Acoustic impedance, Acoustic coupler, Complex mass density, Fluid saturated.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1988
Accession Number
ADA201220

Entities

People

  • Steven D. Grant

Organizations

  • Naval Postgraduate School

Tags

DTIC Thesaurus Topics

  • Acoustic Impedance
  • Acoustic Properties
  • Acoustics
  • Bulk Modulus
  • Circuit Analysis
  • Electrical Circuits
  • Electrical Impedance
  • Electrical Properties
  • Electrical Resistance
  • Fluid Dynamics
  • Frequency Shift
  • Impedance
  • Measurement
  • Network Science
  • Specific Heat
  • Transducers
  • United States Naval Academy

Fields of Study

  • Physics

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Plasma Physics / Magnetohydrodynamics
  • Structural Dynamics.