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Design and Performance of a 15 KW Wide Band Acoustic Facility

Report Number: AFFDL TR 66-8
Author: Hankel, Keith M.
Author: Henderson, John P.
Corporate Author: Air Force Flight Dynamics Laboratory
Laboratory: Air Force Flight Dynamics Laboratory
Date of Publication: 1966-03
Pages: 62
Contract: Laboratory Research - No Contract
Project: 1309; 4437
Task: 130901; 443705
AD Number: AD0634904

Details of the design and performance of a wide band, high intensity, acoustic test facility are presented. The wide band siren, horn network, sound isolation room, noise measurement and analysis instrumentation, input power requirements, and measured performance characteristics of the facility are described. The problem of the presence of several discrete frequency peaks in the spectrum of the original siren configuration is discussed along with techniques which were investigated to improve the spectrum. Frequency modulation fo the rotor speeks is shown to result in a relatively smooth, continous random spectrum. The limited spectrum shaping capabilities of the siren are discussed. Recommendations are made for improvements that could be incorporated into future design of sirens of this type.

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