Accession Number:

ADA218041

Title:

Lateral Attenuation of Military Aircraft Flight Noise

Descriptive Note:

Final rept. Apr 1984-Sep 1988,

Corporate Author:

HARRY G ARMSTRONG AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1989-07-01

Pagination or Media Count:

63.0

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 attackfighter aircraft A-10A, F4D, F-5E, F-15, F-16, and F-18 bomber aircraft B-52G and FB-111 cargotanker 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 engineairplane installation effects. Airbaseairport 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

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE