Accession Number:

AD0649462

Title:

SOUND ATTENUATION CHARACTERISTICS OF THE ARMY APH-5 HELMET

Descriptive Note:

Corporate Author:

ARMY AEROMEDICAL RESEARCH UNIT FORT RUCKER AL

Report Date:

1967-02-01

Pagination or Media Count:

24.0

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.

Subject Categories:

  • Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE