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Vertical Occupant Loading in Car Crashes; Test Methods and Countermeasures
Technical Paper
2015-01-1459
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Vertical loading can cause thoracic and lumbar spine injuries to a car occupant. Crashes potentially causing occupant vertical loads include; rollover events or free flying events when the car lands on its wheels, and run off road events when the car goes into the ditch and collides with an embankment. To date, there is no standardized test method evaluating this occupant loading mechanism. The aim of this study was to develop test methods addressing vertical occupant loading for car occupants and to evaluate countermeasures for reduction of such loads. Based on real world run off road crashes, representative test track methods were developed. These complete vehicle test track methods were used to provide input to a simplified and repeatable rig test method. The rig test method comprises a dummy positioned in a seat attached to a frame and exposed to a vertical acceleration. Vertical pelvis acceleration is monitored, as an indication of potential loads through the spine. Two different seat designs are compared. The modified seat concept includes a deformation element which is built into the rear part of the seat connection to the seat frame. The deformation element allows for a controlled deformation of up to 25 mm. The space under the seat is cleared to allow for total occupant movement up to 150 mm. During this movement, energy is absorbed by the deformation element as well as the springs and seat cushion material. Compared to the reference production seat, the dummy pelvis vertical acceleration is reduced by 25-32% in the situations tested in this study.
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Jakobsson, L., Björklund, M., and Axelson, A., "Vertical Occupant Loading in Car Crashes; Test Methods and Countermeasures," SAE Technical Paper 2015-01-1459, 2015, https://doi.org/10.4271/2015-01-1459.Also In
References
- Begeman , P. , King , A. , and Prasad , P. Spinal Loads Resulting from -Gx Acceleration SAE Technical Paper 730977 1973 10.4271/730977
- Jakobsson , L. , Bergman , T. , and Johansson , L. Identifying Thoracic and Lumbar Spinal Injuries in Car Accidents Proc of IRCOBI Conference on Biomechanics of Impacts Madrid, Spain 61 71 2006
- Inamasu , J. and Guiot , B.H. Thoracolumbar Junction Injuries after Motor Vehicle Collision: are there Differences in Restrained and Nonrestrained Front Seat Occupants? J Neurosurg Spine Sept 7 3 311 4 2007
- Pintar , F.A. , Yoganandan , N. and Maiman , D.J. Thoracolumbar Spine Fractures in Frontal Impact Crashes Ann Adv Automot Med Oct 56 277 283 2012
- Jakobsson , L. , Lindman , M. , Axelson , A. , Lokensgard , B. et al. Addressing Run Off Road Safety SAE Int. J. Passeng. Cars - Mech. Syst. 7 1 132 144 2014 10.4271/2014-01-0554
- Wang , W.C. , Pintar , F. , Yoganandan , N. and Maiman , D.J. The Continued Burden of Spine Fractures after Motor Vehicle Crashes J Neurosurg Spine 10 86 92 2009
- Huelke , D.F. , Mackay , G.M. and Morris A. Vertebral Column Injuries and Lap-Shoulder Belts J Trauma Apr 38 547 56 1995
- Richards , D. , Carhart , M. , Raasch , C. , Pierce , J. , Steffey , D. and Ostarello , A. Incidence of Thoracic and Lumbar Spine Injuries for Restrained Occupants in Frontal Collisions 50 th Annual Proc. Association for the Advancement of Automotive Medicine 2006
- Ball , S.T. , Vaccaro , A.R. , Albert , T.J. and Cotler , J.M. Injuries of the Thoracolumbar Spine Associated with Restraint Use in Head-On Motor Vehicle Accidents J Spinal Disord. Aug 13 4 297 304 2000
- Yoganandan , N. , Haffner , M. , Maiman , D. , Nichols , H. et al. Epidemiology and Injury Biomechanics of Motor Vehicle Related Trauma to the Human Spine SAE Technical Paper 892438 1989 10.4271/892438
- Aslan , S. , Karcioglu , O. , Katirci , Y. , Kandis , H. , Ezirmik , N. and Bilir , O. Speed Bump-Induced Spinal Column Injury American Journal of Emergency Medicine 23 563 564 2005
- Munjin , M.A. , Zamorano , J.J. , Marré , B. , Ilabaca , F. , Ballesteros , V. , Martinez , C. , Yurac , R. , Urzúa , A. , Lecaros , M. , Fleiderman , J. and Garcia , N. Speed Hump Spine Fractures: Injury Mechanism and Case Series J Spinal Disord Tech Aug 24 6 386 9 2011
- Lund , Å. , Palmertz , C. , Jakobsson , L. , and Andersson , G. In-Depth Study of Volvo Cars in Rollover Accidents Proc of IRCOBI Conference on Biomechanics of Impacts Barcelona, Spain 297 314 1999
- Prasad , P. The Dynamic Response of the Spine During +Gz Acceleration Ph.D. Dissertation Wayne State University Detroit, USA 1973
- Duma , S.M. , Kemper , A.R. , McNeely , D.M. , Brolinson , P.G. and Matsouka , F. Biomechanical Response of the Lumbar Spine in Dynamic Compression Biomed Sci Instrum 42 476 81 2006
- Yoganandan , N. , Arun , M.W.J. , Stemper , B.D. , Pintar , F.A. and Maiman , D.J. Biomechanics of Human Thoracolumbar Spinal Column Trauma from Vertical Impact Loading Ann Adv Automot Med. Sep 57 155 166 2013