Semiempirical Airframe Noise Prediction Model and Evaluation with Flight Data

Hersh, Alan S. and Burcham Jr., Frank W. and Putnam, Terrill W. and Lasagna, Paul L. (1976) Semiempirical Airframe Noise Prediction Model and Evaluation with Flight Data. Technical Report NASA TM X-56041, Research Engineering, NASA Dryden Flight Research Center.

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Abstract

A semiempirical maximum overall sound pressure level (OASPL) airframe noise model was derived. The noise radiated from aircraft wings and flaps was modeled by using the trailing-edge diffracted quadrupole sound theory derived by Ffowes Williams and Hall. The noise radiated from the landing gear was modeled by using the acoustic dipole sound theory derived by Curle. The model was successfully correlated with maximum OASPL flyover noise measurements obtained at the NASA Dryden Flight Research Center for three jet aircraft - the Lockheed JetStar, the Convair 990, and the Boeing 747 aircraft. The model was also used to correlate and interpret one-third octave band sound pressure level flyover data.

EPrint Type:	NASA Technical Memorandum
Keywords:	Airframe noise, Nonpropulsive noise
Subjects:	Aircraft/Project: Boeing 747 Aircraft/Project: Convair 990 Aircraft/Project: C-140 JetStar (70 - 77) Physics: (70) Physics - General
ID Code:	711
Deposited On:	14 Febuary 2006
Additional Information:	36 pages. Some of the information presented herein was previously included in the paper "Semi-Empirical Airframe Noise Prediction Model," presented by the authors at the AIAA 3rd Aero-Acoustics Conference, Palo Alto, California, July 20 to 22, 1976.