Noise Attenuation Performance of the Joint Service Aircrew Mask (JSAM) Fixed Wing (FW) Variant with Flight Helmets

Abstract

Noise attenuation performance was measured on the Joint Service Aircrew Mask (JSAM) Fixed Wing (FW) variant with the HGU-55/P, HGU-68/P, and HGU-84/P helmets at the Air Force Research Laboratory's (AFRL) Acoustics facilities at Wright-Patterson Air Force Base in March 2011. American National Standards Institute (ANSI) S12.6 and S12.42 methods were used to measure the passive attenuation of the systems. The objective of this study was to identify the noise attenuation performance and determine if the performance requirements were met as defined in the JSAM-FW Performance Specification. The addition of the JSAM-FW degraded the noise attenuation performance when compared to all the helmets alone: the objective (ANSI S12.42) passive insertion loss (across most frequencies) and the subjective noise attenuation (ANSI S12.6) performance (only low frequencies).

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2013
Accession Number
ADA585728

Entities

People

  • Hilary L. Gallagher
  • Richard L. McKinley

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Acoustics
  • Air Force
  • Air Force Facilities
  • Air Force Research Laboratories
  • Attenuation
  • Department Of Defense
  • Ear
  • Flight Helmets
  • Frequency
  • Hearing Protection
  • Helmets
  • Insertion Loss
  • Losses
  • Measurement
  • Military Research
  • Standards
  • Test Facilities

Readers

  • Acoustics.
  • Aerospace logistics and air mobility.
  • Military Engineering.