Accession Number:
AD0649462
Title:
SOUND ATTENUATION CHARACTERISTICS OF THE ARMY APH-5 HELMET
Descriptive Note:
Corporate Author:
ARMY AEROMEDICAL RESEARCH UNIT FORT RUCKER AL
Personal Author(s):
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.
Descriptors:
Subject Categories:
- Protective Equipment