Accession Number:

ADA051700

Title:

Atmospheric-Absorption Adjustment Procedure for Aircraft Flyover Noise Measurements.

Descriptive Note:

Final rept. May-Sep 77,

Corporate Author:

DYTEC ENGINEERING INC HUNTINGTON BEACH CA

Personal Author(s):

Report Date:

1977-12-01

Pagination or Media Count:

90.0

Abstract:

An analytical method was developed for adjusting measured aircraft noise levels for differences in atmospheric absorption between test and reference meteorological conditions along the sound propagation path. The method is based on the procedure in the proposed American National Standard ANS S1.26 for calculating pure-tone sound absorption as a function of the frequency of the sound and the temperature, humidity, and pressure of the air. Measured aircraft noise levels are assumed to be 13-octave-band sound pressure levels. A computer program was written in FORTRAN IV to carry out the calculations. The operation of the computer program, the required input data, and all symbols and terms used in the program are described. A program listing of source statements is provided. Recommendations are given for applying the method to routine processing of aircraft noise measurements. Author

Subject Categories:

  • Atmospheric Physics
  • Computer Programming and Software
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE