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The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Aerodynamic Noise And The Estimation Of Noise In Aircraft

Report Number: WADC TR 52-341
Author(s): Orville R. Rogers, Robert F. Cook
Corporate Author: Aircraft Laboratory
Laboratory: Aircraft Laboratory
Date of Publication: 1952-02
Pages: 44
Contract: None Given
Project: None Given
PB Number: PB135909
AD Number: AD0013026
Original AD Number: 13026

Abstract:
Aircraft noise in the frequency range above 600 cps which produces the greatest interference with speech communication, can be controlled by practical amounts of sound insulation and can be estimated from the indicated airspeed in most jet propelled or multi-engine propeller driven aircraft. Since interference with speech communication is the most serious effect of aircraft noise, the methods contained in this report for estimation of the insulation required enable the aircraft designers to provide for necessary sound insulation in the earliest design stages. The principal source responsible for noise above 600 cps in the aforementioned aircraft types is the airflow over the fuselage and this noise is found to depend approximately upon the 2.75 power of the indicated air speed. Sound reduction afforded by the insulation is also found to be simply related to the surface density of the batting plus that of any non-porous septa included in the blanket.

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