This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Yaw Testing of an Instrumented Vehicle with and without Braking
Technical Paper
2004-01-1187
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Two methods for calculating speed from curved tire marks were investigated. The commonly used critical speed formula and a computer simulation program were evaluated based on their ability to reproduce the results of full-scale yaw tests. The effects of vehicle braking and friction coefficient were studied. Twenty-two yaw tests were conducted at speeds between 70 and 120 km/h. For half of the tests, about 30% braking was applied. Using the measured sliding coefficient of friction, both the critical speed formula and the computer simulations under-predicted the actual speed of the vehicle. Using the measured peak coefficient of friction, both methods over-estimated the actual speed. There was less variance in the computer simulation results. Braking tended to increase the speeds calculated by the critical speed formula.
Recommended Content
Technical Paper | Validation of the Circular Trajectory Assumption in Critical Speed |
Technical Paper | A Study of Errors in Yaw-Based Speed Estimates Due to Effective Braking |
Technical Paper | Computer Simulation of Pavement Edge Traversal |
Authors
Topic
Citation
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, https://doi.org/10.4271/2004-01-1187.Also In
References
- Bellion P Project Y.A.M. Vehicle Testing and Findings – Victoria Police, Accident Investigation Section (970955) Warrendale, PA Society of Automotive Engineers 1997
- Brach RM An Analytical Assessment of the Critical Speed Formula (970957) Warrendale, PA Society of Automotive Engineers 1997
- Dickerson CP Arndt MW Arndt SM Mowry GA Evaluation of Vehicle Velocity Predictions Using the Critical Speed Formula (950137) Warrendale, PA Society of Automotive Engineers 1995
- Fricke LB Traffic Accident Reconstruction Northwestern University Traffic Institute 1990
- Goudie DW Bowler JJ Brown CA Heinrichs BE Siegmund GP Tire Friction of During Locked Wheel Braking (2000-01-0471) Warrendale, PA Society of Automotive Engineers 2000
- Hink CD Critical Speed Yaw Testing. Washington Association of Technical Accident Investigators publication 83-01 Bellevue WA 1983
- Lambourn RF The Calculation of Motor Car Speeds from Curved Tyre Marks Journal of the Forensic Science Society 1989 29
- MacInnis DD Cliff WE Ising KW A comparison of moment of inertia estimation techniques for vehicle dynamic simulation (970951) Warrendale, PA Society of Automotive Engineers 1997
- Reveley MS Brown DR Geunther DA A Comparison Study of Skid and Yaw Marks (890635) Warrendale, PA Society of Automotive Engineers 1989
- Semon, M. Determination of Speed from Yaw Marks, Chapter 4, A Summary of the Literature, a Practical Analytical Method, and a Conclusion about Accuracy 1995