Impulse Peak Insertion Loss Testing of the Gentex(registered trademark) Corporation Enhanced Combat Helmet - Marine Corps

Abstract

The standard measure of attenuation provided by a headworn device (i.e., hearing protection device (HPD), helmet) in response to an impulsive noise is the impulse peak insertion loss (IPIL). This technical memorandum describes the IPIL testing conducted in accordance with the American National Standards Institute (ANSI) standard S12.42-2010 on the Gentex Corporation Enhanced Combat Helmet Marine Corps (ECH-M; Model A14493-3A1A6, Model A14493-3A0A6). Rather than testing at the nominal test levels specified by ANSI S12.42-2010 (i.e., 130, 150, and 170 decibel peak (dBP, re: 20 Pa)), all samples were tested at the nominal levels of 160 and 170 dBP, as these higher levels are more representative of military occupation impulse noise exposures. A total of five samples were fitted to an acoustic test fixture two times each for a total of 10 trials per test level. No samples were rejected. Results of the testing revealed mean IPIL values within 0.5 dB of each other at the 160 dBP and 170 dBP nominal levels.

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Document Details

Document Type
Technical Report
Publication Date
Aug 30, 2021
Accession Number
AD1146387

Entities

People

  • Alexa H. Kolias
  • Derek W. Schwaller
  • Jeremy S. Federman
  • Natalie Silvia
  • Stephanie J. Karch

Organizations

  • Naval Submarine Medical Research Laboratory

Tags

Communities of Interest

  • Biomedical
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Acquisition
  • Air Compressors
  • Air Pressure
  • Attenuation
  • Biomedical Research
  • Corporations
  • Data Acquisition
  • Free Field
  • Frequency
  • Impulse Noise
  • Insertion Loss
  • Losses
  • Marine Corps
  • Microphones
  • Shock Tubes
  • Test Fixtures
  • Transfer Functions

Readers

  • Acoustics.