A multi-factorial study was conducted to evaluate helmet system performance during exposure to fighter aircraftbuffet vibration. Head/helmet rotational motions and human head-slaved tracking performance were measuredunder selected head/helmet configurations, task complexity, and exposure conditions. The results showedsignificant increases in the peak head and helmet roll and yaw motions, and in the peak head pitch motion forthe off-axis head/helmet orientation. Coinciding with these results were the significant increase in the meantracking error and decrease in the percent time-on-target. A decrease in the peak head pitch and the peak headand helmet yaw motions was observed with a greater shift in the head/helmet center-of-gravity. Trackingperformance was significantly degraded with the more complex task, and with exposure to the buffet vibration ascompared to the no vibration condition. The results of this study strongly suggested that head/helmetorientation, task complexity, and helmet weight distribution may be important factors for developing effectivehelmet system design criteria.
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