EFFECT OF TEMPERATURE AND HUMIDITY ON AIRCRAFT NOISE PROPAGATION
This report presents the results of a test program conducted to measure the effect of varying meteorological conditions on aircraft flyover noise levels. Detailed temperature and humidity data were obtained using an instrument system carried by a light aircraft. High and low altitude inversions as well as standard lapse rate atmospheres were investigated. Level flyovers were conducted, using a DC-9-10 aircraft operated at a thrust of 6,000 lbs., as a constant noise source. Measured noise levels varied up to 4 EPNdB depending upon the absorptive properties of the atmosphere. Several analysis procedures were investigated in an effort to correct noise data for weather conditions. Weather correction procedures based on single point meteorological data were inadequate to normalize, to reference conditions, the noise data for those conditions with non-uniform temperature and humidity profiles. A layered analysis procedure, however, normalized all flyover noise levels to those levels taken under near reference conditions. The layered analysis procedure incrementally adjusts the measured peak spectra based on the acoustic absorption in each increment. These results indicated that noise certification testing under non-uniform temperature and humidity conditions could, if allowed, be conducted provided that frequent and detailed meteorological data is available and the layered weather correction procedure is used.
Federal Aviation Administration800 Independence Avenue, SW
Washington, DC United States 20591
- McCollough, J B
- True, H C
- Publication Date: 1975-9
- Pagination: 106 p.
- TRT Terms: Absorption; Acoustic measuring instruments; Acoustic properties; Acoustics; Aircraft noise; Altitude; Atmosphere; Atmospheric temperature; Data collection; Data reduction; Environment; Humidity; Jet transports; Meteorological phenomena; Numerical analysis; Pavement layers; Peak periods; Sound level; Sound transmission; Spectrum analysis; Temperature; Thrust; Values in measurement; Weather
- Uncontrolled Terms: Correction (Mathematics); High altitude; Intensity; Low altitude
- Old TRIS Terms: Acoustic measurement; Lapse rate; Meteorological data; Peak values; Temperature inversion
- Subject Areas: Aviation; Environment;
- Accession Number: 00092380
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: FAA-RD-75-100 Final Rpt.
- Files: NTIS, TRIS, USDOT
- Created Date: Nov 5 1976 12:00AM