Accession Number : ADA138042

Title :   Comparison of Real-Ear Attenuation Characteristics of the Standard SPH-4 Earcup and a Prototype Crushable Earcup,

Corporate Author : ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL

Personal Author(s) : Mozo,B T ; Nelson,W R

PDF Url : ADA138042

Report Date : Dec 1983

Pagination or Media Count : 24

Abstract : The use of the SPH-4 aviator's helmet in the Army is to provide hearing protection, voice communications, and head protection against impact. Efforts have been made recently to improve protection in the region of the earcup. In 1977, USAARL contracted with Simula Incorporated to develop an earcup which would provide greater energy absorption on impact and still provide sound attenuation equivalent to the current standard earcup. A prototype has been submitted for evaluation of noise attenuation and comparison to the current standard earcup. The crushable earcup was found to provide greater hearing protection at most test frequencies.

Descriptors :   *EAR PROTECTORS, COMPARISON, ACOUSTIC ATTENUATION, HEARING, PROTECTION, FLIGHT HELMETS, SOUND PRESSURE, LEVEL(QUANTITY), TABLES(DATA), NOISE(SOUND), MEASUREMENT

Subject Categories : Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE