Sound Transmission through Ducts and Aircraft Noise Prediction. Volume I. Technical Report.

Abstract

Aircraft engine acoustical lining impedance models, ray acoustics, hydrodynamic modes, and transient analysis of sound propagation in variable area duct studies were applied to aircraft noise prediction. The effects of several duct lining configurations in a TF33 P5 and a CFM56 engined KC-135B aircraft were predicted. The prediction was based on a model corrected to fit flight noise data and modified by including theoretical duct noise attenuation predictions. The transient solution of variable area ducts permitted the prediction of sound propgation in bullet nose inlets for no low and was moderately successful when a potential flow was included with low Mach numbers. Volume I contains the technical report and analysis. Volume II contains the user's manuals and listings of the computer codes developed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1982
Accession Number
ADA115783

Entities

People

  • John J. Schauer
  • John T. Datko
  • Robert W. Guyton

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Properties
  • Acoustics
  • Air Temperature
  • Aircrafts
  • Boundary Layer
  • Contracts
  • Differential Equations
  • Geometry
  • Layers
  • Mach Number
  • Partial Differential Equations
  • Pressure Distribution
  • Sound Pressure
  • Sound Transmission
  • Steady State
  • Turbines
  • Turbojet Engines

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Computer Science.
  • Wave Propagation and Nonlinear Chaotic Dynamics.