ATMOSPHERIC-ABSORPTION ADJUSTMENT PROCEDURE FOR AIRCRAFT FLYOVER NOISE MEASUREMENTS

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 1/3-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)

Corporate Authors:
DyTec Engineering Incorporated

Huntington Beach, CA United States
Authors:
- MARSH, A H
Publication Date: 1977-12

Media Info

Pagination: 90 p.

Subject/Index Terms

TRT Terms: Acoustic measuring instruments; Acoustics; Aircraft noise; Ambient noise; Atmospheric physics; Atmospheric pressure; Atmospheric temperature; Computer programs; Effective sound pressure; Filters; Humidity; Jet propelled aircraft; Measurement; Meteorology; Noise; Overpasses; Sound absorption; Sound level; Sound transmission
Identifier Terms: FORTRAN (Computer program language)
Uncontrolled Terms: Noise measurement
Old TRIS Terms: Acoustic measurement; Atmospheric absorption; Bandpass filters; Barometric pressure; Jet plane noise; Overflight
Subject Areas: Aviation; Environment; Geotechnology;

Filing Info

Accession Number: 00175529
Record Type: Publication
Source Agency: National Technical Information Service
Report/Paper Numbers: FAA-RD-77-167 Final Rpt., DYTEC-R-7705
Contract Numbers: W1-77-5660-1
Files: NTIS, TRIS
Created Date: Jun 14 1978 12:00AM