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Comparison of Linear Variable Deceleration Rate Rollover Reconstruction to Steer-Induced Rollover Tests
Technical Paper
2012-01-0469
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A variable deceleration rate approach to rollover crash reconstruction was proposed in 2009 by Rose and Beauchamp. A detailed description of Rose and Beauchamp's method was outlined in 2010. The method used a Linearly Variable Deceleration Rate (LVDR) as a function of roll distance. Improvements in responses as a function of time was demonstrated by Rose and Beauchamp using test data from two 208 dolly rollover tests; however, they noted that additional validation work using steering-induced rollover tests would be desirable. This paper provides additional validation of the LVDR model using the steer-induced rollover test data reported in 2011 by Stevens et al. The Over-The-Ground Speed (OGS) and recorded roll rate results from the five steer-induced rollover tests reported by Stevens' in 2011 were compared to reconstructed speed and roll rates as a function of time using the 2010 Rose and Beauchamp LVDR method. Using an appropriate range of average drag factors, the LVDR method produced agreement with the measured results of the Stevens rollover tests. Comparisons showed agreement with the predicted rollover duration, the shape of the roll rate curve and the maximum roll rate. Calculated roll rates were high if the calculated roll duration was low. Low roll durations were found associated with a Constant Drag Factors (CDF) method and the LVDR method utilizing high average drag factors. Greater roll rate uncertainty occurred in roll segments that have long airborne duration and/or high speed change. The LVDR method significantly improves prediction of speed and roll rate time history compared to a CDF method.
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Authors
Topic
Citation
Arndt, M., Stevens, D., and Arndt, S., "Comparison of Linear Variable Deceleration Rate Rollover Reconstruction to Steer-Induced Rollover Tests," SAE Technical Paper 2012-01-0469, 2012, https://doi.org/10.4271/2012-01-0469.Also In
Rollover, and Side Impact, Safety Test Methodology, and Structural Crashworthiness 2012
Number: SP-2336; Published: 2012-04-13
Number: SP-2336; Published: 2012-04-13
References
- Carter, J. Luepke, P. Henry, K. Germane, G. et al. “Rollover Dynamics: An Exploration of the Fundamentals,” SAE Int. J. Passeng. Cars - Mech. Syst. 1 1 80 104 2009 10.4271/2008-01-0172
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- Carter, J. “Keynote Address-Rollover Session,” 2010 SAE World Congress April 2010
- Rose, Nathan A. Beauchamp, Gray “A Variable Deceleration Rate Approach to Rollover Crash Reconstruction,” Collision 5 1 74 82 2010
- Stevens, D. Arndt, S. Wayne, L. Arndt, M. et al. “Rollover Crash Test Results: Steer-Induced Rollovers,” SAE Technical Paper 2011-01-1114 2011 10.4271/2011-01-1114
- Arndt, Mark W. et al. “Drag Factors from Rollover Crash Testing for Crash Reconstructions,” ASME Paper IMECE2011-65537
- Asay, A. Woolley, R. “Rollover Testing of Sport Utility Vehicles (SUVs) on an Actual Highway,” SAE Technical Paper 2010-01-0521 2010 10.4271/2010-01-0521