This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Design of the Occupant Protection System for Critical Side Impact requirements
ISSN: 0148-7191, e-ISSN: 2688-3627
Published December 13, 2009 by The Automotive Research Association of India in India
Annotation ability available
This paper describes the critical side impact requirements of overall global side regulations and the sensitivity of various side injury parameters on NCAP rating assessment. The federal side impact regulation FMVSS 214 made very stringent by adding oblique pole impact in addition to moving deformable barrier (MDB) test. Though the vehicle velocity is less in oblique pole test, the dynamic intrusions are more which causes severe injury for 5th and 50th %le occupants than MDB test. It was observed that typical injury parameter in side impact requirements is the thorax compression than other injuries, because it is very sensitive than Pelvic, Abdomen regions. To meet these critical injury requirements in side impact, the optimal side restraint system is mandatory in order to develop a safer vehicle with high NCAP score.
The side restraint system includes side airbags (thorax and curtain), Hip pusher block/foam padding, door trim arm rest, seat belts and seats. As mentioned, thorax compression is critical injury, thorax or pelvic thorax air bag and Hip pusher blocks are given much importance to protect the thorax region. Hip pusher block/ pelvic bolster is optimized such that it protects the pelvic area of different occupants ranges from 5th and 50th %le occupants. For better thorax protection, various sizes of thorax bags and its impact on thorax compression are studied. The single chamber thorax airbag is enlarged and its area is divided into two parts such that the bottom (Pelvic) chamber pushes the pelvic part in advance before thorax engages with door trim, and the top(Thorax) chamber provides cushioning effect for shoulder, such that thorax/rib cage will be protected in between under controlled deployment.
CitationMouli, P., "Design of the Occupant Protection System for Critical Side Impact requirements," SAE Technical Paper 2009-28-0055, 2009, https://doi.org/10.4271/2009-28-0055.
- Mowry Greg Shilliday David “Reducing Rib deflection in the IIHS test by preloading the pelvis independent of intrusions” The 19 th International Technical conference on Enhanced Safety of Vehicles ESV
- Mc Neill. A Holzner. M et al “Current world wide side impact activities-Divergence Vs Harmonization and the possible effect on future car design” The 19 th International Technical conference on Enhanced Safety of Vehicles ESV
- Pintar Frank A. Yoganandan N. et al “Occupant Injury patterns in side pole crashes” CIREN report
- Tencer Allan F Kaufman Robert et al “Reducing Primary and secondary Impact loads on the pelvis during side impact” The 19 th International Technical conference on Enhanced Safety of Vehicles ESV
- NHTSA report “Amending side impact dynamic test-adding oblique pole test” US Deportment of Transportation August 2007
- Code of Federal regulations, Transportation, Part 571.214 2008
- Kral Jiri “IIHS Side Impact Analysis using LS Dyna/Madymo Coupling” 8 th International LS Dyna user conference
- LS-Dyna Keyword Manual May 2007
- Madymo 6.4 Theory and model manual TNO Automotive
- NHTSA final notice “Consumer Information-New car assessment program” US Deportment of Transportation