NOISE ENCOUNTERED IN ROTARY-WING AIRCRAFT

Abstract

The acoustic environment within rotary-wing aircraft consists of a mixture of noises. The report identifies, describes, and illustrates the primary and secondary noise-producing mechanisms associated with helicopter operation. The noise sources include main rotors, antitorque rotors, main and secondary transmission and gear-shaft distribution systems, and auxiliary power units. In addition to describing specific noise generators, the report presents composite noise envelopes illustrating typical noise environs of rotary-wing vehicles having different configurations of rotor - to - power plant matings. Alterations in internal noise which occur during conditions of hover and forward flight are described and aeromedical factors such as speech interference and potential auditory risk are identified.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1969
Accession Number
AD0702422

Entities

People

  • Donald C. Gasaway

Organizations

  • United States Air Force School of Aerospace Medicine

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aerodynamic Noise
  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Auxiliary Power Units
  • Fuselages
  • Gas Turbines
  • Helicopters
  • Human Factors Engineering
  • Medical Personnel
  • Power
  • Rotary Wing Aircraft
  • Rotor Blades (Turbomachinery)
  • Turbine Components
  • Turbines
  • Turbojet Engines
  • Turboshaft Engines

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerospace Engineering
  • Systems Analysis and Design