Accession Number : ADA133386

Title :   Study of Noise-Certification Standards for Aircraft Engines. Volume 1. Noise-Control Technology for Turbofan Engines.

Descriptive Note : Final rept.,

Corporate Author : DYTEC ENGINEERING INC LONG BEACH CA

Personal Author(s) : Marsh,Alan H

PDF Url : ADA133386

Report Date : Jun 1983

Pagination or Media Count : 51

Abstract : This study, reported in three volume, had the purpose of considering the feasibility of establishing an FAA requirement for a manufacturer of aircraft engines to demonstrate compliance with an engine noise-level standard in order to obtain an engine noise type certificate. The objective of engine-noise type certification (if feasible on the basis of economic reasonableness, technological practicality, and appropriateness to the type design) would be to supplement the aircraft-noise type certification requirements in Part 36 of the Federal Aviation Regulations. The scope of the study was limited to aircraft turbofan engines. Volume 1 identifies sources of noise produced by aircraft turbofan engines, proposes a working definition of an engine's envelope within which an engine manufacturer may incorporate noise control design features, and evaluates applications of noise-control designs to 22 experimental and production versions of turbofan engines developed over a period from late 1950s to the mid 1970s and ranging in nominal take-off-rated thrust from 7.2 to 236 kN (1600 to 53 000 lb). A description is included of the general procedure for selecting appropriate noise-control designs applicable within the engine envelope for various sources of engine noise.

Descriptors :   *Jet engine noise, *Noise reduction, *Turbofan engines, Thrust, Static tests, Sources, Intensity, Limitations, Control, Aircraft engines, Envelope(Space), Aircraft industry, Regulations, United States Government, Standards, Feasibility studies

Subject Categories : Acoustics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE