Correction Procedures for Aircraft Noise Data. Volume III. Filter Effects.

Abstract

A method has been developed to quantify errors in measurement, correction and extrapolation of aircraft noise data which are attributable to spectrum slope and nonideal filter transmission characteristics. The method's fundamental basis is an iterative calculation scheme which recovers an estimate of the true spectrum shape of a signal from its measured band levels. This 'true' spectrum can then be extrapolated to other distances or have frequency dependent corrections made to it on an exact basis without need for worry about filter or slope errors. The new spectrum may then be re-integrated to produce band levels suitable for input to EPNdB or PNL calculations. Applying this procedure to real flyover data and comparing the resultant values of EPNL with those using FAR Part 36 procedures showed only small differences usually. However, the technique provides a consistent method for the analysis of errors due to these sources and should be useful for estimating their magnitude in the future. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1980
Accession Number
ADA091016

Entities

People

  • Louis C. Sutherland

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Aircraft Noise
  • Atmospheric Attenuation
  • Attenuation
  • Background Noise
  • Bandwidth
  • Engineering
  • Frequency
  • Frequency Bands
  • Frequency Response
  • Measurement
  • Numerical Integration
  • Spectrum Analysis
  • Spectrum Analyzers
  • Standards
  • Transmission Loss
  • White Noise

Readers

  • Acoustics.
  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Regression Analysis.