SOUND ATTENUATION CHARACTERISTICS OF THE ARMY APH-5 HELMET

Abstract

An evaluation of the real-ear sound attenuation characteristics of the Army APH-5 Crash Protective Helmet was done with procedures and equipment specified by ASA Z24.22-1957. The results show that the APH-5 offers high attenuation at test frequencies 3,000 through 8,000 Hz. However, the APH-5 has relatively low sound attenuation between 75 and 2,000 Hz. In view of the poor sound attenuation characteristics of the APH-5, it was recommended that the present earmuffs be replaced with high efficiency ear protective muffs. If changing earmuffs is not feasible, it is recommended that the APH-5 be replaced by a helmet with high sound attenuation characteristics.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1967
Accession Number
AD0649462

Entities

People

  • Robert L. Keiser
  • Robert T. Camp Jr.

Organizations

  • United States Army Aeromedical Research Lab

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Human Systems

DTIC Thesaurus Topics

  • Abstracts
  • Aircrafts
  • Amplifiers
  • Army Aircraft
  • Attenuation
  • Classification
  • Efficiency
  • Electronic Switches
  • Frequency
  • Human Factors Engineering
  • Instrumentation
  • Measurement
  • Military Aircraft
  • Oscillators
  • Security
  • Sound Pressure
  • Standards

Readers

  • Acoustics.
  • Educational Psychology
  • Military Engineering.