Investigation of the Impact Performance of the U.S. Navy Flight Deck Cranial

摘要

1. The current HGU-25 failed to meet the ANSI Z89.1 150 G threshold for any impact and generally resulted in the highest peak G, HIC, and SI for any headgear tested in this study2. Significant variation was observed between the legacy and current cranial liners and between legacy cranial test assets.3. The lack of configuration control for the HGU-25 has resulted in unreliable impact attenuation performance of the system.4. The flight deck cranial can be modified (MOD 3) to meet the ANSI Z89.1 threshold for impact energy attenuation tests (at room temperature), showing the lowestpeak accelerationand HICvalues for the Rearand Frontimpact locations.5. Some COTS/MOTS replacements to the HGU-25 exist that would provide better impact protection to maintainers6. An experimental liner replacement material was tested and proven to provide better impact protection to the current cranial.