On Measuring the Acoustic Intensity of Hydroacoustic Sources.

Abstract

With the recent interest in using two-microphone technique to measure acoustic intensity, fundamental questions arise when considering this method for hydroacoustic studies. The acoustic intensity generated by a hydrodynamic source is related solely to those pressure components that propagate. The basic questions are then, what influence does the nonpropagating hydrodynamic pressure fluctuations have on the intensity probe when used in the nearfield of the source and can their effect be removed from a measured intensity spectrum? These two questions are addressed in this paper. An example indicates that the non-propagating pressure fields of a turbulent boundary layer flow can be accounted for approximately. The result is not generally applicable to three-dimensional fields, however. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 25, 1984
Accession Number
ADA142484

Entities

People

  • G. C. Lauchle

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Boundary Layer
  • Boundary Layer Flow
  • Corporations
  • Engineering
  • Flow Fields
  • Layers
  • Mach Number
  • Measurement
  • Microphones
  • Navy
  • Pennsylvania
  • Physics Laboratories
  • Three Dimensional
  • Turbulent Boundary Layer
  • Turbulent Flow
  • Universities

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.