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Results from Calculating the Acceleration at an ELR in a Steer Induced Rollover Crash Test
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 01, 2014 by SAE International in United States
Annotation ability available
Assuming rigid body motion, recorded acceleration and recorded roll rates at the center of gravity, equations are used to calculate the local three-dimensional accelerations at hypothetical seating positions' Emergency Locking [seat belt] Retractors (ELR) during a steer induced rollover crash. For a threshold of 0.7 g, results demonstrated that intervals in the vehicle's response that may cause the ELR's inertial sensor to move into a neutral zone were limited to localized high magnitude negative vertical acceleration events during the rollover segment with a median duration of 4 ms, average duration of 4.8 ms and a maximum calculated duration of 31.7 ms. Changing the threshold to 0.35 g reduced the interval count by 70 percent and maximum duration by approximately 50 percent. Since a retractor in an interval when an inertial sensor may move into a neutral position will unlock only after belt retraction and at an acceleration ratio below its threshold, the duration that a retractor may be unlocked was probably less than the duration of an interval when a vehicle's response would allow an inertial sensor to move into a neutral zone. Results of the analysis were consistent with prior published research that noted limited and brief periods of instances in rollover crashes when the inertial sensor may be in a neutral zone. Calculating an interval that a vehicle's response may allow a retractor to move into a neutral zone does not mean that a specific retractor will move into a neutral zone. To asses if a specific retractor will move into a neutral zone its performance should be analyzed. It is beyond the scope of the paper, and not possible from the analyzed testing, to include a complete analysis of occupants' kinematics. As identified in prior research, occupant kinematics analysis was necessary in determining whether an inertial sensor in a neutral zone during a rollover event will result in belt spool out.
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CitationArndt, M. and Wiechel, J., "Results from Calculating the Acceleration at an ELR in a Steer Induced Rollover Crash Test," SAE Technical Paper 2014-01-0528, 2014, https://doi.org/10.4271/2014-01-0528.
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