NOISE GENERATED BY SECONDARY AND AUXILIARY AIRCRAFT SYSTEMS.
Final rept. 1 Nov 67-1 Nov 68,
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX
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A variety of noise-generating mechanisms contribute to the overall noise environment encountered within fixed- and rotary-wing aircraft. The report contains descriptions and illustrations of secondary and auxiliary systems found within aircraft which contribute to the composite noise. Types of noise-generating mechanisms include 1 transmission, gear-reduction, and shaft distribution systems 2 air-conditioning and pressurization systems 3 defrosting systems 4 air-distribution ducts and vents, and air- circulating and blower units 5 ground and airborne auxiliary power units and systems and 6 aerodynamic and aeroelastic disturbances, including devices such as air brakes and landing gear. Author