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Accuracy and Sensitivity of Yaw Speed Analysis to Available Data
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Accident reconstructionists rarely have complete data with which to determine vehicle speed, and so the true value must be bracketed within a range. Previous work has shown the effect of friction uncertainty in determining speed from tire marks left by a vehicle in yaw. The goal of the current study was to assess improvements in the accuracy of vehicle speed estimated from yaw marks using progressively more scene and vehicle information. Data for this analysis came from staged S-turn maneuvers that in some cases led to rollover of sport utility vehicles. Initial speeds were first calculated using the critical curve speed (CCS) formula on the yaw marks from the first portion of the S-maneuver. Then computer simulations were performed with progressively more input data: i) the complete tire marks from the whole S-maneuver, ii) measured vehicle mass, iii) measured suspension stiffness and damping, and iv) measured steering history. Simulations based on the complete tire marks reduced the average error compared with the CCS equation if measured accelerations were also matched. Adding the remaining input data to the simulations did not further improve the accuracy of the reconstructed vehicle speed.
CitationHeinrichs, B., Lee, J., and Young, C., "Accuracy and Sensitivity of Yaw Speed Analysis to Available Data," SAE Technical Paper 2019-01-0417, 2019, https://doi.org/10.4271/2019-01-0417.
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- Bellion, P., “Project Y.A.M. (Yaw Analysis Methodology) Vehicle Testing and Findings - Victoria Police, Accident Investigation Section,” SAE Technical Paper 970955, 1997, doi:10.4271/970955.
- Dickerson, C., Arndt, M., Arndt, S., and Mowry, G., “Evaluation of Vehicle Velocity Predictions Using the Critical Speed Formula,” SAE Technical Paper 950137, 1995, doi:10.4271/950137.
- Fricke, L.B., Traffic Accident Reconstruction First Edition (Evanston: Northwestern University Traffic Institute, 1990). ISBN:0-912642-07-6.
- Lambourn, R.F., “The Calculation of Motor Car Speeds from Curved Tyre Marks,” Journal of the Forensic Science Society 29, 1989.
- Brach, R., “An Analytical Assessment of the Critical Speed Formula,” SAE Technical Paper 970957, 1997, doi:10.4271/970957.
- Cliff, W., Lawrence, J., Heinrichs, B., and Fricker, T., “Yaw Testing of an Instrumented Vehicle with and without Braking,” SAE Technical Paper 2004-01-1187, 2004, doi:10.4271/2004-01-1187.
- Heinrichs, B., Goulet, J., Fix, R., and King, M., “Measuring and Modeling Suspensions of Passenger Vehicles,” SAE Technical Paper 2013-01-0774, 2013, doi:10.4271/2013-01-0774.
- Goudie, D.W., Bowler, J.J., Brown, C.A., Heinrichs, B.E. et al., “Tire Friction during Locked Wheel Braking,” SAE Technical Paper 2000-01-1314, 2000, doi:10.4271/2000-01-1314.
- SAE International Surface Vehicle Recommended Practice, “Use of the Critical Speed Formula,” SAE Standard J2969, Rev. Jan. 2017.
- Steffan, H. and Moser, A., “The Collision and Trajectory Models of PC-CRASH,” SAE Technical Paper 960886, 1996, doi:10.4271/960886.
- “Canadian Vehicle Specifications,” Transport Canada, Ottawa, ON.
- MacInnis, D., Cliff, W., and Ising, K., “A Comparison of Moment of Inertia Estimation Techniques for Vehicle Dynamics Simulation,” SAE Technical Paper 970951, 1997, doi:10.4271/970951.
- Garrott, W., “Measured Vehicle Inertial Parameters - NHTSA’s Data Through September 1992,” SAE Technical Paper 930897, 1993, doi:10.4271/930897.
- Winkler, C., Campbell, K., and Mink, C., “Variability in Center of Gravity Height Measurement,” SAE Technical Paper 920050, 1992, doi:10.4271/920050.
- Heinrichs, B., Mac Giolla Ri, B., and Hunter, R., “Sensitivity of Collision Simulation Results to Initial Assumptions,” SAE Int. J. Passeng. Cars - Mech. Syst. 5(2):807-832, 2012, doi:10.4271/2012-01-0604.