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ENHANCEMENT OF SEAT PERFORMANCE IN LOW-SPEED REAR IMPACT
Technical Paper
2001-06-0084
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English
Abstract
Benchmark testing of existing seat designs reveals poor performance in low-speed rear impacts. In tests according to the test procedure proposed by GdV, ETH and Autoliv, the neck injury criterion NIC exceeds the limiting value of 15 for almost all seats without a CSD protection system. As only few new car models offer this, a system was developed and tested for aftermarket fitting. The Aftermarket Anti Whiplash System, AWS, consists of a yielding device which is fitted to the seat rails and allows the whole seat to rotate and move backwards. This reduces thorax acceleration and thus the NIC value. As the force required to actuate the device depends on the position of the seat, the system offers optimum protection for large and small occupants.
Tests with rear impact dummies (BioRID and HIII(TRID)) show a noticeable reduction in NIC and head rebound speed compared to the standard seat. Loadings to the neck at delta v 15 km/h with AWS are in the same magnitude as at 9 km/h without AWS. MADYMO simulations with real crash pulses have been performed, and the potential benefit of AWS is estimated on the basis of those results.
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Authors
Citation
Zellmer, H., Stamm, M., Seidenschwang, A., and Brunner, A., "ENHANCEMENT OF SEAT PERFORMANCE IN LOW-SPEED REAR IMPACT," SAE Technical Paper 2001-06-0084, 2001.Also In
References
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- Lundell, B. Jakobsson, L. Alfredsson, B. Jernstrom, C. Isaksson-Hellman, I. Guidelines for the Design of a Car Seat Concept for Improved Protection Against Neck Injuries in Rear-end Car Impacts SAE International Congress and Exposition Detroit 1998
- Davidsson, J Svensson, M.Y. Flogård, A. Håland, Y. Jakobsson, L. Linder, A. Lövsund, P. Wiklund, K. BioRID I—A new biofidelic rear impact dummy IRCOBI Conference Gothenborg 1998
- Ishikawa, T. Okano, N. Ishikura, K. Ono, K. An Evaluation of Prototype Seats Using BioRID-P3 and Hybrid III with TRID Neck IRCOBI Conference Montpellier 2000
- Muser, M. Walz, F. Zellmer, H. Biomechanical Significance of the Rebound Phase in Low Speed Rear End Impacts IRCOBI Conference Montpellier 2000
- Zellmer, H. Stamm, M. Muser, M. Walz, F. Hell, W. Langwieder, K.
- Eriksson, L. Boström, O. Assessing the influence of crash pulse, seat force characteristics, and head restraint position in NIC in rear-end crashes using a mathematical BioRID dummy IRCOBI Conference Barcelona 1999