Linear Impact Procedure for Occupant Ejection Protection
The objective of this document is to enhance the test procedure that is used for ejection mitigation testing per the NHTSA guidelines as mentioned in the FMVSS226 Final Rule document (NHTSA Docket No. NHTSA-2011-0004).
The countermeasure for occupant ejection testing is to be tested with an 18kg mass on a guided linear impactor using the featureless headform specifically designed for ejection mitigation testing.
SAE does not endorse any particular countermeasure for ejection mitigation testing. However, the document reflects guidelines that should be followed to maintain consistency in the test results. Examples of currently used countermeasures include the Inflatable Curtain airbags and Laminated Glass.
The testing procedure is as follows:
Determine the daylight opening
Identify target locations per the FMVSS226 Final Rule §5.2
Target locations for all windows and daylight openings
Perform the target elimination process
Reconstitute the targets
Determine the zero-plane
In case of advanced glazing, determine if the glazing has to be part of the test and pre-brake it at a 75mm offset
If yes, than follow the procedure for pre-breaking the laminated glazing
NHTSA issued a new ruling on Ejection Mitigation testing, with the use of a simplified linear impactor procedure. The ejection mitigation countermeasures are expected to prevent the occupants from ejection in a real life crash event, which represents a rollover scenario.
This SAE document details the guidelines for linear impactor testing, and represents the industry standards set forth for consistency in the results generated, through the use of setup procedures and lessons learned.