Accession Number : AD0649462

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

Corporate Author : ARMY AEROMEDICAL RESEARCH UNIT FORT RUCKER AL

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

PDF Url : AD0649462

Report Date : Feb 1967

Pagination or Media Count : 24

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

Subject Categories : Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE