TEST RESULTS FROM THE BOUNDARY LAYER FACILITY (THEORY AND EXPERIMENTAL COMPARISON)

Abstract

The problem of acoustic radiation of panels excited by random pressure fluctuation of the turbulent boundary layer was investigated. The main purpose of the paper is to show by using a relatively simple functional representation of the space-time correlation of the wall pressure fluctuation, and by the use of Lyons-Dyer method, that motion and radiation intensity of a simply-supported panel agree reasonably well with experimental results. The most striking feature of the excitation mechanism is the so-called coincidence which has profound effects on the response of the structure and power radiations. If, under certain conditions, a mismatch occurs between wave speeds on the panel and the pressure field, panel displacement and acoustic radiation should be reduced. Such a mismatch is caused by a turbulence pressure eddy which decays faster than the mode's wavelength on the structure.

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Document Details

Document Type
Technical Report
Publication Date
May 13, 1966
Accession Number
AD0669217

Entities

People

  • L. Maestrello

Organizations

  • Boeing Commercial Airplanes

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Aircrafts
  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Convection
  • Cross Correlation
  • Fluid Dynamics
  • Fluid Mechanics
  • Frequency
  • Frequency Shift
  • Jet Propulsion
  • Mach Number
  • Power Spectra
  • Pressurization
  • Standing Waves
  • Turbulent Boundary Layer

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Structural Dynamics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster