Potential Effects of Friction on Injury Measures Computed in Aircraft Seat HIC Analysis Testing

Paper #:
  • 2017-01-2054

  • 2017-09-19
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. It has been shown that the friction between the head form and contact surfaces can affect the test results obtained in other safety applications. 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 various friction characteristics applied to the head form. The results indicate that the level of friction on the test device head form can influence the ability to pass the HIC analysis test. In addition, it was found that these results are affected by the use of friction characteristics representative of human skin compared with dummy skin.
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