DESIGN AND PERFORMANCE OF A 15 KW WIDE BAND ACOUSTIC FACILITY.
Final technical rept., Nov 60-Jun 64,
AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO
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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. Author
- Test Facilities, Equipment and Methods