Potential Effects of Deceleration Pulse Variations on Injury Measures Computed in Aircraft Seat HIC Analysis Testing

Paper #:
  • 2017-01-2052

Published:
  • 2017-09-19
Abstract:
Aircraft seating systems are evaluated utilizing a variety of impact conditions and selected injury measures. Injury measures like the Head Injury Criterion (HIC) are evaluated under standardized conditions using anthropometric dummies such as those outlined in 14 CFR part 25. An example would be a dummy seated in an upright position held with a two point belt decelerated from an impact speed and allowed to engage components that are in front of the dummy. Examples of head contact surfaces would include video monitors, a wide range of seat back materials, and airbags from which the HIC and other injury measures can be calculated. Other injury measures, such as Nij, are also of interest and can be measured with the Hybrid III dummy as well. A minimum deceleration pulse is defined as part of the regulations for a frontal impact. In this study the effect of variations in decelerations that meet the requirements is considered. In this study a series of LS-DYNA Finite Element simulations of a generalized aircraft seat were performed to determine the variation in HIC and Nij observed based on variations in the deceleration pulse. The results indicate that the pulse characteristics affect the resulting head motions and can influence the ability to pass the HIC analysis test.
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