Helmet Cold Conditioning: Correlation of Structural Temperatures in Actual and Simulated Cold Environments,
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER ALA
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An experiment was conducted at the US Army Aeromedical Research Laboratory, USAARL, to correlate the helmet thermal characteristics found in cold temperature conditioning as required by current impact test methodologies American National Standards Institute ANSI Standard Z90.1 and the Department of Transportation DOT Motor Vehicle Safety Standard MVS No. 218, Motorcycle Helmet 49CSR571.218 and the thermal characteristics which occur during actual use by the wearer in a cold environment. Four types of helmets were used in this evaluation sling suspension, form-fit, standard motorcycle, and short motorcycle helmets. Temperatures were taken within the helmet structure using thermocouples at the following locations on top of the exterior surface of the shell, at the interface between the shell and the crushable liner, at the center of the crushable and at the center of the comfort liner. Standard helmet impact test methodologies do not simulate potential, real world, cold climate conditions. The standard impact test methodologies are inappropriate for the determination of cold temperature dynamic response of a helmet system.
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