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Biomechanical Assessment of a Rear-Seat Inflatable Seatbelt in Frontal Impacts
Published November 07, 2011 by The Stapp Association in United States
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This study evaluated the biomechanical performance of a rear-seat inflatable seatbelt system and compared it to that of a 3-point seatbelt system, which has a long history of good real-world performance. Frontal-impact sled tests were conducted with Hybrid III anthropomorphic test devices (ATDs) and with post mortem human subjects (PMHS) using both restraint systems and a generic rear-seat configuration. Results from these tests demonstrated: a) reduction in forward head excursion with the inflatable seatbelt system when compared to that of a 3-point seatbelt and; b) a reduction in ATD and PMHS peak chest deflections and the number of PMHS rib fractures with the inflatable seatbelt system and c) a reduction in PMHS cervical-spine injuries, due to the interaction of the chin with the inflated shoulder belt. These results suggest that an inflatable seatbelt system will offer additional benefits to some occupants in the rear seats. Further research is needed to assess the field effectiveness, customer comfort and acceptance and change in the belt usage rate with the inflatable seatbelt system.
- Srinivasan Sundararajan - Ford Motor Co.
- Stephen W. Rouhana - Ford Motor Co.
- Derek Board - Ford Motor Co.
- Ed DeSmet - Ford Motor Co.
- Priya Prasad - Ford Motor Company (retired)
- Jonathan D. Rupp - University of Michigan Transportation Research Institute
- Carl S. Miller - University of Michigan Transportation Research Institute
- Lawrence W. Schneider - University of Michigan Transportation Research Institute
CitationSundararajan, S., Rouhana, S., Board, D., DeSmet, E. et al., "Biomechanical Assessment of a Rear-Seat Inflatable Seatbelt in Frontal Impacts," SAE Technical Paper 2011-22-0008, 2011, https://doi.org/10.4271/2011-22-0008.
- Bilston, L.E, Du, W. and Brown, J. (2010) A matched-cohort analysis of belted front and rear seat occupants in newer and older model vehicles shows that gains in front occupant safety have outpaced gains for rear seat occupants. Accident Analysis and Prevention. 42, pp. 1974-1977.
- Burkes, J.M., Cromack, R.J. and Ziperman, H. (1975) Impact Testing of Allied Chemical “Inflataband” With Dummies and Human Volunteers, Vol. II. Department of Transportation Report No. DOT-HS-801739, U.S. Department of Transportation, Washington, D.C.
- Esfahani, E., S and Digges, K. (2009) Trend of rear occupant protection in frontal crashes over model years of vehicles, SAE paper 2009-01-0377, Detroit, Michigan.
- Fitzpatrick, M. and Egbert, T., (1975) Inflatable Belt Development for Subcompact Car Passengers. Department of Transportation Report No. DOT-HS-801720 U.S. Department of Transportation, Washington, D.C.
- Horsch, J.D., Horn, G. and McCleary, J.D. (1991) Investigation of Inflatable Belt Restraints. Proc. 35th Stapp Car Crash Conference, pp. 237-250, SAE, Warrendale, PA.
- Kuppa, S., Saunders, J., Fessahaie, O. (2005) Rear seat occupant protection in frontal crashes. Proc. 19th International Technical Conference on Enhanced Safety of Vehicles, Paper No. 05-0212, U.S. Department of Transportation, Washington, D.C.
- Mertz, H.J., Irwin, A.L., Prasad, P. (2003) Biomechanical and Scaling Bases for Frontal and Side Impact Injury Assessment Reference Values. Stapp Car Crash Journal, 47, pp. 155-188.
- Michaelson, J., Forman, J. and Kent, R. (2008) Rear Seat Occupant Safety: Kinematics and Injury of PMHS Restrained by a Standard 3-Point Belt in Frontal Crashes. Stapp Car Crash Journal, 52, pp. 295-325.
- NCSA/NHTSA (2009) Traffic Safety Facts 2009.
- Rouhana, S.W., Elhagediab, A.M., Walbridge, A., Hardy, W.N., and Schneider, L.W. (2001) Biomechanics of 4-point seatbelt systems in frontal impacts. Stapp Car Crash Journal, 47, pp. 367-400.
- Rouhana, S.W., Bedewi, P., Kankanala, S.V., Prasad, P., Zwolinski, J.J., Medufsky, A., Rupp, J.D., Jeffreys, T.J., and Schneider, L.W. (2003) Biomechanics of 4-point seatbelt systems in frontal impacts. Stapp Car Crash Journal, 47, pp. 367-400.
- SAE J211 (2007) Instrumentation for Imapct Test, Society of Automotive Engineers, Warrendale, PA.
- Sahraei, E., Digges, K., and Marzougui, D. (2010) Reduced protection for belted occupants in rear seats relative to front seats of new model year vehicles. Annals of Advances in Automotive Medicine, 54, pp. 149-158.
- Schneider, L.W., Robbins, D.H., Pflüg, M.A., and Snyder, R.G., (1983) Development of Anthropometrically based Design Specifications for an Advanced Adult Anthropomorphic Dummy Family'. Volume 1, Report DOT-HS-806-715. National Highway Traffic Safety Administration U.S. Department of Transportation, Washington, D.C.
- Trowbridge, M.J., Kent, R. (2009) Rear-Seat Motor Vehicle Travel in the U.S. American Journal of Preventive Medicine. 37(4), pp. 321-323.
- Walsh, M.J. (1976) Sled Tests of Three-Point Systems Including Air Belt Restraints. Department of Transportation Report No. DOT-HS-801939 U.S. Department of Transportation, Washington, D.C.
- Yoganandan, N., Skrade, D., Pintar, F., Relnartz, J. and Sances, A.Jr. (1991) Thoracic Deformation Contours in a Frontal Impact. Proc. 35th Stapp Car Crash Conference, pp. 47-63, SAE, Warrendale, PA.