Long-Duration Exposure Criteria for Head-Supported Mass
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
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The modern crew station of Army helicopters uses the helmet as an integral component of the aircraft control systems. What was once viewed as a simple device for crash protection now supports devices including night vision goggles, chemical mask, head-up displays, and weapon aiming systems. These devices combine to increase the biomechanical stress in the neck. This study investigated the effects of increasing helmet torque on the motion of the helmeted head under the conditions of long duration whole body vibration exposure. Twelve U.S. Army volunteer aviators were exposed to 4 hours of whole body vibration, similar to that found in a UH-60 helicopter, while wearing four different helmets. Helmet torques, as calculated at the point where the head connects to the spine, ranged from a standard aviator helmet to a helmet with a chemical mask and a night vision goggle. Head motion was measured using a three dimensional active infrared marker system attached to a fixture held in the subjects teeth.
- Human Factors Engineering and Man Machine Systems
- Protective Equipment