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A Supplemental Analysis of Selected Two-Vehicle Front-to-Rear Collisions from the NASS/CDS
Technical Paper
2013-01-0223
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The National Automotive Sampling System/Crashworthiness Database System (NASS/CDS) is a well-known digital repository containing statistics on hundreds of thousands of vehicle crashes that occurred over the past 30 years. Many of the NASS crashes contain estimates of Delta-v calculated using WinSMASH, a common software reconstruction package. Recent work indicates that WinSMASH typically underestimates Delta-v in frontal impacts, and that inclusion of restitution significantly improves the estimate of Delta-v to within 1% of the value recorded on EDR-equipped vehicles [1]. Prior experiments have shown that in front-to-rear collisions, restitution is a strong inverse function of closing velocity (the difference between the respective pre-impact speeds in the bullet and target vehicles) [2], with calculated restitutions ranging from 0.265 down to 0.0 for closing speeds varying from 11.4 mph to as high as 36 mph. This work uses front-to-rear impact data from the NASS/CDS to examine the effect of coefficient of restitution on calculated Delta-v values for both the bullet and target vehicles. The WinSMASH-based values of Delta-v and dissipated energy contained in the NASS/CDS were compared to Delta-v values computed using traditional analytical (energy and momentum) equations. With restitution set equal to zero, the mean value of the calculated values of Delta-v (for bullet and target vehicles) ranged between −1.76 and 1.47 percent of the values contained in the NASS/CDS. However, including values of restitution computed iteratively using pre-impact closing velocity increased the computed values of Delta-v for both bullet and target vehicles by an average of 10.38 - 13.17 percent over those provided (in the absence of restitution) by the NASS/CDS. In addition, it was found that small errors in reported values of vehicle mass or dissipated energy (2% - 10%) produced similar or smaller percentage variations in calculated Delta-v values for both the bullet and target vehicles.
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Authors
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Citation
Leifer, J., "A Supplemental Analysis of Selected Two-Vehicle Front-to-Rear Collisions from the NASS/CDS," SAE Technical Paper 2013-01-0223, 2013, https://doi.org/10.4271/2013-01-0223.Also In
References
- Niehoff , P. , and Gabler , H.C. The Accuracy of WinSMASH Delta-V Estimates: The Influence of Vehicle Type, Stiffness, and Impact Mode 50 th AAAM Annual Conference, Annals of Advances in Automotive Medicine October 2006 73 89
- Cipriani , A. , Bayan , F. , Woodhouse , M. , Cornetto , A. et al. Low Speed Collinear Impact Severity: A Comparison Between Full Scale Testing and Analytical Prediction Tools with Restitution Analysis SAE Technical Paper 2002-01-0540 2002 10.4271/2002-01-0540
- The Long-Term Effectiveness of Center High Mounted Stop Lamps in Passenger Cars and Light Trucks NHTSA Technical Report DOT HS 808 696 http://www.nhtsa.gov/cars/problems/equipment/CHMSL.HTML March 1998
- Krafft , M. , Kullgren , A. , and Tingvall , C. Crash Pulse Recorders in Rear Impacts - Real Life Data Proceedings of the 16 th International Technical Conference on the Enhanced Safety of Vehicles http://www-nrd.nhtsa.dot.gov/pdf/Esv/esv16/98S6O10.PDF
- Bailey , M. , Wong , B. , and Lawrence , J. Data and Methods for Estimating the Severity of Minor Impacts SAE Technical Paper 950352 1995 10.4271/950352
- Kerkhoff , J. , Husher , S. , Varat , M. , Busenga , A. et al. An Investigation into Vehicle Frontal Impact Stiffness, BEV and Repeated Testing for Reconstruction SAE Technical Paper 930899 1993 10.4271/930899
- Campbell , K. Energy Basis for Collision Severity SAE Technical Paper 740565 1974 10.4271/740565
- Prasad , A. CRASH3 Damage Algorithm Reformulation for Front and Rear Collisions SAE Technical Paper 900098 1990 10.4271/900098
- Sharma , D. , Stern , S. , Brophy , J. , and Choi , E. An Overview of NHTSA's Crash Reconstruction Software WinSMASH Proc. 20 th International Technical Conference on the Enhanced Safety of Vehicles http://www-nrd.nhtsa.dot.gov/pdf/esv/esv20/07-0211-W.pdf
- Hampton , C.E. and Gabler , H.C. Evaluation of the Accuracy of NASS/CDS Delta-V Estimates from the Enhanced WinSMASH Algorithm 54 th AAAM Annual Conference, Annals of Advances in Automotive Medicine January 2010 241 252
- Brach , R. Modeling of Low-Speed, Front-to-Rear Vehicle Impacts SAE Technical Paper 2003-01-0491 2003 10.4271/2003-01-0491
- Brach , R. , and Brach , M. Vehicle Accident Analysis and Reconstruction Methods Society of Automotive Engineers Warrendale, PA 978-0-7680-3437-0 2005 10.4271/R-397
- Anderson , R. , Welcher , J. , Szabo , T. , Eubanks , J. et al. Effect of Braking on Human Occupant and Vehicle Kinematics in Low Speed Rear-End Collisions SAE Technical Paper 980298 1998 10.4271/980298
- Wang , Q. , and Gabler , H.C. Accuracy of Vehicle Frontal Stiffness Estimates for Crash Reconstruction Proceedings of the Twentieth International Conference in Enhanced Safety of Vehicles Lyons, France June 2007
- Hampton , C.E. , and Gabler , H.C. NASS/CDS Delta-V Estimates: The Influence of Enhancements to the WinSmash Crash Reconstruction Code 53 rd AAAM Annual Conference, Annals of Advances in Automotive Medicine October 2009 91 102
- Ogden , C.L. , Fryar , C.D. , Carroll , M.D. , and Flegal , K.M. Mean Body Weight, Height and Body Mass Index, United States 1960-2002 Advanced Data from Vital Health Statistics, CDC, No. 347 27 OCT 2004
- Brach , R. , Brach , R. , and Louderback , A. Uncertainty of CRASH3 ΔV and Energy Loss for Frontal Collisions SAE Technical Paper 2012-01-0608 2012 10.4271/2012-01-0608