Analysis Of Interior Noise-Control Treatments For High-speed Propeller-Driven Aircraft

Abstract

An analytical method is described for prediction of the interior noise levels for propeller-driven aircraft, given the exterior noise signature, its harmonic spectrum, and a description of the fuselage sidewall structure and various candidate "add-on" noise-control elements. The structural response is described by the theory of Koval, but simplified to consider the stiffeners as "smeared" elements. The incremental transmission loss (TL) due to add-on noise-control elements is derived from the Beranek and Work method. Comparisons between experimental data and the theory are presented. The method is reasonably accurate below the ring frequency, but is somewhat conservative at the normal incidence angle. This method is, however, expedient computationally, is economical, and permits rapid comparisons of noise-control penalties for various treatment concepts. © 1982 American Institute of Aeronautics and Astronautics, Inc., All rights reserved.

Department(s)

Mechanical and Aerospace Engineering

International Standard Serial Number (ISSN)

0021-8669

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 American Institute of Aeronautics and Astronautics, All rights reserved.

Publication Date

01 Jan 1982

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