Sound Attenuation of Rotary-Wing Aviation Helmets with Oregon Aero(Trademark) Earcup Replacement Products

Abstract

The sound attenuation of the HGU-56/P Aircrew Integrated Helmet System (AIHS) and the HGU-84/P Rotary-Wing Helmet System (RWHS) configured with Oregon Aero(Trademark) replacement earcup products was evaluated in accordance with the American National Standard Methods for Measuring the Real-Ear Attenuation of Hearing Protectors [ANSI S12.6-1997 (R2002)], Method A: Experimenter-supervised fit. Sound attenuation of both the HGU-56/P AIHS and HGU-84/P RWHS configured with the Oregon Aero HushKit(Trademark) replacement earcup foam or SoftSeal(Trademark) replacement earcup seal was essentially equivalent to the helmet's standard configurations. However, the Oregon Aero(Trademark) SoftSeal/HushKit Combo(Trademark), soft replacement earcups provided significantly poorer sound attenuation than the standard configuration. As with the Army's current flight helmet/earcup combination, double protection (i.e., earplugs in addition to the sound-protective flight helmet) is required in certain high noise environments.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 2005
Accession Number
ADA441086

Entities

People

  • Elmaree Gordon
  • Melinda E. Hill
  • William A. Ahroon

Organizations

  • United States Army Aeromedical Research Lab

Tags

Communities of Interest

  • Air Platforms
  • Biomedical

DTIC Thesaurus Topics

  • Aerial Warfare
  • Air Force
  • Aircrafts
  • Analysis Of Variance
  • Attenuation
  • Department Of Defense
  • Ear
  • Flight Helmets
  • Frequency
  • Frequency Bands
  • Hearing Protection
  • Insertion Loss
  • Losses
  • New York
  • Rotary Wing Aircraft
  • Standards
  • Test And Evaluation

Readers

  • Acoustics.
  • Military Engineering.