Accession Number : AD0780577

Title :   Small Turbine Engine Noise Reduction. Volume VI, Part I. Noise Prediction Program User's Manual.

Descriptive Note : Final rept. 7 May 71-31 May 73,

Corporate Author : AIRESEARCH MFG CO OF ARIZONA PHOENIX

Personal Author(s) : Gipson,W. M. ; Goodman,B. M. ; Ho,P. Y.

Report Date : DEC 1973

Pagination or Media Count : 170

Abstract : Vol. 6, Part I, calculates the bare-engine noise signature and typical flyover sound levels of small, installed, aircraft turbopropulsion engines. Techniques were employed or adapted to accurately predict the radiated acoustic signature (during either static test or aircraft flyover) of turboprop and turbofan propulsion systems in the 80- to 1000-shaft-horsepower class for turboprops and in the 400- to 5000-pound-thrust class for turbofans. In order to adequately predict the flyover noise signature of such an engine, it was first necessary to predict the contributions to that signature from each component. Garrett AiResearch and their subcontractor, Wyle Laboratories, Inc., cooperatively evaluated published prediction methods for each source, using measuring small-engine noise data. (Author)

Descriptors :   *Turboprop engines, *Turbofan engines, *Noise reduction, *Reconnaissance aircraft, *Computer programs, Aerial reconnaissance, Combat surveillance, Low altitude, Jet engine noise, Attenuators, FORTRAN

Subject Categories : Patrol and Reconnaissance Aircraft
      Computer Programming and Software
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE