This report presents the results of measurements on the noise propagated to the side of military aircraft during a series of controlled level flyovers. Data were acquired on attack/fighter aircraft (A-10A, F4D, F-5E, F-15, F-16, and F-18); bomber aircraft (B-52G and FB-111); cargo/tanker aircraft C-18, C-141, KC-10A, KC-135A, and KC-135R); and special purpose aircraft (C-21 and E-3A). In addition to the normal attenuation provided by wave divergence (spherical spreading) and atmospheric absorption, noise propagated laterally to the ground from aircraft during flight is further reduced by the combination of several other frequency dependent phenomena such as ground, meteorological, forward flight, and engine/airplane installation effects. Airbase/airport noise models typically define this extra lateral attenuation for single event measures such as the Sound Exposure Level as a function of the elevation angle as viewed from a given location on the ground. Based on the results of these data, as new algorithm has been developed and incorporated in the Air Force NOISEMAP model. (kr)
Lateral Attenuation of Military Aircraft Flight Noise
1989
63 pages
Report
Keine Angabe
Englisch
Acoustics , Aircraft , Aircraft noise , Attack aircraft , Acoustic measurement , Fighter aircraft , Airports , Algorithms , Angles , Atmospheric attenuation , Attenuation , Bomber aircraft , Elevation , Engines , Exposure(General) , Level flight , Level(Quantity) , Meteorology , Military facilities , Models , Noise , Sides , Sound , E-3A aircraft , C-21 aircraft , C-18 aircraft , C-141 aircraft , KC-10A aircraft , KC-135A aircraft , KC-135R aircraft
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