Insertion Loss of the HGU-56/P Aircrew Integrated Helmet System with Oregon Aero Earcup Replacement Products

Abstract

The insertion loss of the HGU-56/P Aircrew Integrated Helmet System (AIHS) configured with Oregon Aero replacement earcup products was evaluated in accordance with the American National Standard Microphone-in-Real-Ear and Acoustic Test Fixture Methods for the Measurement of Insertion Loss of Circumaural Hearing Protection Devices [ANSI S12.42-1995 (R1999)], microphone-in-real-ear method. Insertion loss of the HGU-56/P AIHS configured with the Oregon Aero HushKit replacement earcup foam was essentially equivalent to the helmet's standard configuration. Employing the Oregon Aero SoftSeal replacement earcup seal with the HushKit foam yielded a small improvement in insertion loss over the standard helmet configuration. However, the Oregon Aero SoftSeal/HushKit Combo soft replacement earcups provided significantly poorer insertion loss than the standard earcup 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, 2006
Accession Number
ADA460887

Entities

People

  • Alisa Laprath
  • Elmaree Gordon
  • Martin Robinette
  • Melinda Hill
  • William A. Ahroon

Organizations

  • United States Army Aeromedical Research Lab

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Air Force
  • Analysis Of Variance
  • Attenuation
  • Department Of Defense
  • Ear
  • Flight Helmets
  • Frequency
  • Hearing Protection
  • Insertion Loss
  • Losses
  • Measurement
  • Microphones
  • Operating Systems
  • Rotary Wing Aircraft
  • Standards
  • Test And Evaluation
  • Test Fixtures

Readers

  • Acoustics.
  • Military Engineering.