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Threshold Time-to-fire Determination for SRS to Control Occupant Injuries in Real World Accidents
Technical Paper
2011-26-0094
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SIAT 2011
Language:
English
Abstract
Supplementary Restraints Systems (SRS) are provided in automobiles for occupant protection in severe accidents. Real world accidents are a varied mix of types and severities; thereby a need exists to engineer such systems for adequate performance robustness. Statistical data suggests high serious to fatal occupant injuries due to inadvertent SRS deployments, or sub-optimal Time-to-Fires (TTF) which lead to bag induced injuries.
This paper explains the work done on a project to establish requirements of SRS deployments in different load cases of low, medium and high severity. LSDyna and MADYMO CAE applications have been used for this work and final validation through physical tests. The study considers different real world accident types and involves analysis of occupant-restraints system interactions. It includes variations in occupant types and seat belt configurations. Injury values, occupant displacements and its proximity to airbags were the main criteria to arrive at deployment threshold parameters. Vehicle dependent accident speed determination which could necessitate SRS activation was estimated through this approach. The deployment matrix was thereby a combination of load case, time-to-fire and vehicle speed. The input parameters for electronics sensing calibration were derived and trade-off was validated. The restraints “no fire” and “must fire” threshold definition was established with clarity on transition zone. The study shall ascertain a robust “no fire” in slow speed accidents that drive insurance premiums for customers.
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Authors
Topic
Citation
Khare, P., Kudale, S., and Prasad, A., "Threshold Time-to-fire Determination for SRS to Control Occupant Injuries in Real World Accidents," SAE Technical Paper 2011-26-0094, 2011, https://doi.org/10.4271/2011-26-0094.Also In
References
- World Health Organization (WHO) “Global Status Report On Road Safety” 2009
- “Global Road Safety Partnership (GRSP) Annual Report” 2008
- Road Accidents Statistics in Europe “European Road Safety Day - Youth on the Road, Road Safety is no Accident” April 2007
- Dietmar, Otte et al. “Assessment of Injury Severity of Nearside Occupants in Pole Impacts to side of Passenger Cars in European Traffic Accidents: Analysis of German and UK In-depth Data” Paper No 09-0243, ESV Conference 2009
- www.autoliv.com
- NHTSA Report “Counts of Frontal Airbag Related fatalities and seriously injured persons” July 2007
- Miller, Ryan A et al. “Injury Optimization Of the Frontal Crash Supplemental Restraint System (SRS) Deployment Matrix” Paper No 07-0073, ESV Conference 2007