Real-Ear Sound Attenuation Characteristics of the DH-132 Helmet for Armored Vehicle Crewmen
Abstract
The U.S. Army Aeromedical Research Laboratory was requested by the Preventive Medicine Division of The Office of the Surgeon General to test off- the-shelf helmets that would be suitable for replacement of the standard T-56-6 CVC helmet. Audiometric data taken from samples of tank crewmen revealed hearing losses which indicated that there is an urgent need for the development of a helmet that would protect against the adverse acoustic environments associated with tank operations. Previous evaluation by real-ear tests of sound attenuation established the R-56-6 to be an inadequate acoustic protective device for armored vehicle crewmen. Three off-the-shelf helmets were tested and recommended as suitable for consideration as a possible replacement for the standard CVC helmet. The DH-132 was identified by the Armor Center as their choice of the three presented as most appropriate for the armor environment. A Materiel Need (MN) document was prepared and staffed to procure the DH-132. The first group procured for engineering and service test DH-132-1 was found less efficient than the original DH-132. This identified deficiency was corrected in a second prototype DH-132-2. Data in this report confirms the DH-132-2 meeting or exceeding all acoustic attenuation requirements of the MN and medically acceptable as an acoustic protector for armored vehicle crewmen. Therefore type classification Standard A is recommended for the DH-132-2 helmet.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1973
- Accession Number
- ADA032806
Entities
People
- Ben T. Mozo
- Gordon A. Schott
- Robert T. Camp
- Robert W. Bailey
- Rohinton N. Guzdar
- Timothy M. Hinkel
Organizations
- United States Army Aeromedical Research Lab