This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Effect of Using the Same Tire Friction for Both Vehicles in Impact Speed Reconstructions
Technical Paper
2021-01-0899
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Event:
SAE WCX Digital Summit
Language:
English
Abstract
Most collision reconstructions implicitly assume the same tire/road friction coefficient for all vehicles, despite evidence that friction varies between tires, surfaces, and individual trials. Here we assess the errors introduced by an assumption of a single, universal friction coefficient when reconstructing a collision where vehicles actually had different tire frictions. We used Monte Carlo methods to generate 20,000 synthetic two-vehicle impacts and rest positions using different, randomized friction coefficients for each vehicle and randomized impact speeds. These rest positions were then used to reconstruct both vehicles’ impact speeds assuming a single, common friction coefficient. High and low bounds on the impact speeds were reconstructed using high and low bounds on the common friction. We found that more than 97% of the true impact speeds were in the ranges reconstructed using upper and lower friction bounds. The influence of the similar-friction assumption on the errors in the reconstructed speeds was secondary to the influence of using the wrong average friction for both of vehicles.
Recommended Content
Authors
Citation
Heinrichs, B. and Toscano, D., "The Effect of Using the Same Tire Friction for Both Vehicles in Impact Speed Reconstructions," SAE Technical Paper 2021-01-0899, 2021, https://doi.org/10.4271/2021-01-0899.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 | ||
| Unnamed Dataset 4 |
Also In
References
- Goudie , D.W. , Bowler , J.J. , Brown , C.A. , Heinrichs , B.E. , and Siegmund , G.P. Tire Friction During Locked Wheel Braking SAE Technical Paper 2000-01-1314 2000 https://doi.org/10.4271/2000-01-1314
- Bartlett , W. , Baxter , A. , Livesay , E. , Schmidt , B. et al. Comparison of Drag-Sled and Skidding-Vehicle Drag Factors on Dry Roadways SAE Technical Paper 2006-01-1398 2006 https://doi.org/10.4271/2006-01-1398
- Fricke , L.B. Traffic Accident Investigation Manual 2 Evanston, IL Northwestern University Traffic Institute 1990
- Transport Canada Vehicle Specification Database Collision Investigation and Research Division Ottawa, Ontario Transport Canada
- Heinrichs , B.E. , Goulet , J.F. , Fix , R.C. , and King , M.J. Measuring and Modeling Suspensions of Passenger Vehicles SAE Technical Paper 2013-01-0774 2013 https://doi.org/10.4271/2013-01-0774
- MacInnis , D. , Cliff , W. , and Ising , K. A Comparison of Moment of Inertia Estimation Techniques for Vehicle Dynamics Simulation SAE Technical Paper 970951 1997 https://doi.org/10.4271/970951
- PC-Crash User Manual
- Hunter , R. , Fix , R. , Lee , F. , and King , D. Using Force-Displacement Data to Predict the EBS of Car into Barrier Impacts SAE Technical Paper 2016-01-1483 2016 2016 https://doi.org/10.4271/2016-01-1483
- Crash 3 Technical Manual 1986
- PC-Crash 12.1
- PC-Crash User Manual
- Ishikawa , H. Computer Simulation of Automobile Collision - Reconstruction of Accidents SAE Technical Paper 851729 1985 1985 https://doi.org/10.4271/851729
- Brach , R.M. and Brach , R.M. A Review of Impact Models for Vehicle Collision SAE Technical Paper 870048 1987 1987 https://doi.org/10.4271/870048