Lateral Attenuation of Military Aircraft Flight Noise
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1989
- Accession Number
- ADA218041
Entities
People
- Jerry D. Speakman
Organizations
- Armstrong Laboratory