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):

Report Date:

1983-06-01

Pagination or Media Count:

51.0

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 engines 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.

Subject Categories:

  • Acoustics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE