Sound Attenuation Characteristics of the DH-133A Helmet.
Abstract
This report documents the sound attenuation characteristics of a product improvement of the standard-DH-132A helmet. Results indicate the improved helmet exceeds the attenuation required by the specification at all test frequencies and is significantly better than the DH-132 at most frequencies. A spring tension band between the earcups, improves earcup-to-head retention. A thermo-plastic liner improves stability and comfort. All of the improvements are available in kit form for field upgrade of fielded DH-132A helmets.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1992
- Accession Number
- ADA248732
Entities
People
- Barbara A. Murphy
- Ben T. Mozo
- Linda S. Barlow
Organizations
- United States Army Aeromedical Research Lab