Accession Number : AD0736513

Title :   The Transmission of Sound Inside Absorbing Ducts,

Corporate Author : BOEING CO RENTON WASH TRANSPORT DIV

Personal Author(s) : Schoernich,Heinz E.

Report Date : JAN 1962

Pagination or Media Count : 80

Abstract : The purpose of this report is compile information regarding the transmission of sound inside of ducts so that an engineering approach to the solution of the rotational noise problem created by turbofan engines can be taken. The noise problem is not solved by the material presented here, but an explanation of the theoretical background and a starting point for the design and evaluation of experiments are offered. Thus the goal of reducing the community noise caused by airplanes equipped with turbofan engines will be one step closer. (Author)

Descriptors :   (*DUCTS, *SOUND TRANSMISSION), (*TURBOFAN ENGINES, *JET ENGINE NOISE), EXHAUST NOZZLES, DUCTED FANS, SOUND, ACOUSTIC INSULATION, ACOUSTIC IMPEDANCE, VORTICES, NUMERICAL ANALYSIS

Subject Categories : Acoustics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE