Low Altitude Temperature and Humidity Profile Data for Application to Aircraft Noise Propagation
Title | Low Altitude Temperature and Humidity Profile Data for Application to Aircraft Noise Propagation PDF eBook |
Author | Andrew B. Connor |
Publisher | |
Pages | 68 |
Release | 1975 |
Genre | Airplanes |
ISBN |
NASA Technical Note
Title | NASA Technical Note PDF eBook |
Author | |
Publisher | |
Pages | 616 |
Release | 1975 |
Genre | |
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.
Book Catalog of the Library and Information Services Division: Author-title-series indexes
Title | Book Catalog of the Library and Information Services Division: Author-title-series indexes PDF eBook |
Author | Environmental Science Information Center. Library and Information Services Division |
Publisher | |
Pages | 508 |
Release | 1977 |
Genre | Earth sciences |
ISBN |
Book catalog of the Library and Information Services Division
Title | Book catalog of the Library and Information Services Division PDF eBook |
Author | Environmental Science Information Center. Library and Information Services Division |
Publisher | |
Pages | 514 |
Release | 1977 |
Genre | |
ISBN |
Monthly Catalog of United States Government Publications
Title | Monthly Catalog of United States Government Publications PDF eBook |
Author | |
Publisher | |
Pages | 2834 |
Release | 1975 |
Genre | Government publications |
ISBN |
Book Catalog of the Library and Information Services Division: Subject index
Title | Book Catalog of the Library and Information Services Division: Subject index PDF eBook |
Author | Environmental Science Information Center. Library and Information Services Division |
Publisher | |
Pages | 438 |
Release | 1977 |
Genre | Earth sciences |
ISBN |