Effects of Headform Friction on Ejection Mitigation Testing

Paper #:
  • 2014-01-0533

Published:
  • 2014-04-01
DOI:
  • 10.4271/2014-01-0533
Citation:
Heading, M., Stein, D., and Dix, J., "Effects of Headform Friction on Ejection Mitigation Testing," SAE Technical Paper 2014-01-0533, 2014, doi:10.4271/2014-01-0533.
Pages:
7
Abstract:
Ejection Mitigation testing is now required by the U.S. government through FMVSS 226 [1]. FMVSS 226 contains the requirement of using a linear guided headform in a horizontal impact test into the inflated curtain, or other ejection mitigation countermeasure that deploys in the event of a rollover. The specification provides dimensions for a featureless headform [2] but there are limited specifications for the headform skin surface condition. In the “Response to Petitions” of the 2011 Final Rule for FMVSS 226 [3], the NHTSA declined the option to include a headform cleaning procedure. This research presents a case study to quantify the effect of changes in the friction between the headform and curtain on the measured excursion. The study presented here shows that a change in friction between the headform and curtain can affect excursion values by up to 135 millimeters (mm).
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