Accession Number : AD0649462

Title :   SOUND ATTENUATION CHARACTERISTICS OF THE ARMY APH-5 HELMET,

Corporate Author : ARMY AEROMEDICAL RESEARCH UNIT FORT RUCKER ALA

Personal Author(s) : Camp,Robert T. , Jr. ; Keiser,Robert L.

Report Date : FEB 1967

Pagination or Media Count : 25

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. (Author)

Descriptors :   (*HELMETS, ACOUSTIC PROPERTIES), (*SOUND, ATTENUATION), AUDIOMETRY, PSYCHOACOUSTICS, HEARING, ARMY PERSONNEL, AUDIO FREQUENCY

Subject Categories : Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE