Sound Attenuation Characteristics of the DH-133A Helmet
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
Pagination or Media Count:
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. Sound attenuation, Tanker helmet, Hearing thresholds.
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