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Two-Dimensional Collision Simulations of Low-Speed Crash Tests
Technical Paper
2013-01-0793
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A commercially-available two-dimensional software program, validated to model high speed collisions, was extended to analyze rear-end collisions involving speed changes below 10 miles per hour. Simulation results were compared to the results of several series of published full-scale staged collisions. A total of 84 rear-end crash tests, involving 20 vehicles of different makes and models, were analyzed. Test conditions included free-rolling as well as braked vehicles, and in-line as well as oblique collision configurations.
The analysis demonstrates that the simulation model provides accurate and reliable predictions of vehicle delta-V's for rear-end collisions, under aligned and oblique conditions, and with free-rolling and braked conditions for the foam core and piston-equipped bumper types examined. Using baseline crush stiffness data derived from higher speed barrier tests, the model was found to over-predict peak acceleration values, and correspondingly, under-predict collision durations in low speed collisions. In modeling collisions with closing speeds below 15 mph, a proportionate reduction of the baseline stiffness coefficients was found to significantly improve the model's prediction of the crash pulse shape, and the corresponding peak acceleration and duration. The ability of the model to predict vehicle deformation under these crash conditions was not examined.
It is intended that this technique be used in modeling real-world collisions in conjunction with a separate closed-form momentum analysis. Subsequent to such a momentum analysis, the current technique can be used to model the vehicle speed changes predicted by momentum, and then to examine time-based aspects of the collision such as the timing of vehicle collisions and/or the acceleration time histories and peak accelerations of the involved vehicles, as well as the effects of vehicle alignment and braking.
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Citation
Deyerl, E., Cheng, L., and Gatti, J., "Two-Dimensional Collision Simulations of Low-Speed Crash Tests," SAE Technical Paper 2013-01-0793, 2013, https://doi.org/10.4271/2013-01-0793.Also In
References
- 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
- 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
- Brach , R. Modeling of Low-Speed, Front-to-Rear Vehicle Impacts SAE Technical Paper 2003-01-0491 2003 10.4271/2003-01-0491
- Ojalvo , I. and Cohen , E. An Efficient Model for Low Speed Impact of Vehicles SAE Technical Paper 970779 1997 10.4271/970779
- Scott , W. , Bain , C. , Manoogian , S. , Cormier , J. et al. Simulation Model for Low-Speed Bumper-to-Bumper Crashes SAE Int. J. Passeng. Cars - Mech. Syst. 3 1 21 36 2010 10.4271/2010-01-0051
- Scott , W. , Bonugli , E. , Guzman , H. , and Swartzendruber , D. Reconstruction of Low-Speed Crashes using the Quasi-Static Force vs. Deformation Characteristics of the Bumpers Involved in the Crashes SAE Int. J. Passeng. Cars - Mech. Syst. 5 1 592 611 2012 10.4271/2012-01-0598
- Fittanto , D. and Allen Rodowicz , K. A Comparison of 3D Model Dynamic Simulation Results with Low-Speed Crash Test Data SAE Technical Paper 2012-01-0601 2012 10.4271/2012-01-0601
- Day , T. An Overview of the EDSMAC4 Collision Simulation Model SAE Technical Paper 1999-01-0102 1999 10.4271/1999-01-0102
- Campbell , K. Energy Basis for Collision Severity SAE Technical Paper 740565 1974 10.4271/740565
- www.neptuneeng.com
- 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
- Guzman , H. , McConnell , W. , and Smith , D. Vehicle Dynamics in Non-Collinear Low-Velocity, Rear End Collisions SAE Technical Paper 2004-01-1193 2004 10.4271/2004-01-1193
- Guzman , H. , Meredith , R. , and Hiltner , E. Development of an Impact Pendulum for Use in Collinear, Low- Velocity Front-to-Rear Crash Tests SAE Technical Paper 2006-01-1401 2006 10.4271/2006-01-1401