V/STOL Aircraft Noise Prediction (Jet Propulsors)

Abstract

A computer program is presented for predicting the noise levels of V/ STOL aircraft with jet-propulsive-lift systems. Using the equations developed in Part I of this report the noise levels may also be estimated with hand calculations. Vectored thrust, externally blown flap, upper surface blown flap, internally blown flap, and augmentor wing are the propulsive-lift concepts considered. Semi-empirical equations are derived using the test results and theories for the following aircraft noise sources: Internal engine, jet, excess (core engine), high-lift system, airframe, and auxiliary power unit. The computer program predicts the perceived noise levels and tone corrected perceived noise levels for V/STOL aircraft at any specified sideline distance for known geometrical and operational parameters. This report supersedes the earlier report No. FAA-RD-73-145, August 1973.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1975
Accession Number
ADA028765

Entities

People

  • D. F. Blakney
  • J. G. Tibbets
  • J. S. Gibson
  • N. N. Reddy

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustics
  • Aerodynamic Noise
  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Atmospheric Attenuation
  • Auxiliary Power Units
  • Boundary Layer
  • Computational Fluid Dynamics
  • Computer Programs
  • Doppler Effect
  • Engine Noise
  • Fluid Dynamics
  • Fluid Mechanics
  • Frequency Shift
  • Plastic Explosives
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerospace Engineering