For the prediction of aircraft noise levels perceived at positions lateral to the flight track, lateral attenuation of noise has to be taken into account. Lateral attenuation contains all sound emission and propagation effects on noise, in addition to separately modeled spherical spreading and atmospheric absorption. AIR-1751 provides a method for prediction of lateral attenuation, established by the Society of Automotive Engineers (SAE) in 1981. A particularity of this standard is that it is based on a noise measurements dataset dominated by aircraft with tail-mounted engines. Today's commercial wide-body aircraft fleet is dominated by aircraft with wing-mounted engines. A number of dedicated noise measurement projects have identified an overestimation of lateral noise attenuation in AIR1751 for aircraft with wing-mounted engines and the update process has been initiated by SAE. Airbus applies AIR-1751 in its operational noise level calculation program and therefore required insight in the quality of this standard. For this reason and to support the update work of SAE, supplementary noise measurements at lateral positions were conducted during a planned A300 external noise measurement campaign. This report describes these measurements and provides results in terms of lateral attenuation derived from the measurements.
Lateral Attenuation Based on A300 Noise Measurements
2005
10 pages
Report
No indication
English
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