A Review of Current Procedures for Normalizing Aircraft Flyover Noise Data to Reference Meteorological Conditions
Title | A Review of Current Procedures for Normalizing Aircraft Flyover Noise Data to Reference Meteorological Conditions PDF eBook |
Author | Richard DeLoach |
Publisher | |
Pages | 20 |
Release | 1977 |
Genre | Airplanes |
ISBN |
NASA Technical Note
Title | NASA Technical Note PDF eBook |
Author | |
Publisher | |
Pages | 642 |
Release | 1977 |
Genre | |
ISBN |
Statistical Comparisons of Aircraft Flyover Noise Adjustment Procedures for Different Weather Conditions
Title | Statistical Comparisons of Aircraft Flyover Noise Adjustment Procedures for Different Weather Conditions PDF eBook |
Author | Arnold W. Mueller |
Publisher | |
Pages | 44 |
Release | 1979 |
Genre | Airplanes |
ISBN |
Effect of Temperature and Humidity on Aircraft Noise Propagation
Title | Effect of Temperature and Humidity on Aircraft Noise Propagation PDF eBook |
Author | 'JB' McCollough |
Publisher | |
Pages | 106 |
Release | 1975 |
Genre | |
ISBN |
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.
Scientific and Technical Aerospace Reports
Title | Scientific and Technical Aerospace Reports PDF eBook |
Author | |
Publisher | |
Pages | 1072 |
Release | 1977 |
Genre | Aeronautics |
ISBN |
A comparison of two independent measurements and analyses of jet aircraft flyover noise
Title | A comparison of two independent measurements and analyses of jet aircraft flyover noise PDF eBook |
Author | Robert N. Hosier |
Publisher | |
Pages | 84 |
Release | 1977 |
Genre | Jet planes |
ISBN |
NASA SP.
Title | NASA SP. PDF eBook |
Author | |
Publisher | |
Pages | 654 |
Release | 1978 |
Genre | Aeronautics |
ISBN |