Yaw Testing of an Instrumented Vehicle with and without Braking 2004-01-1187
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.
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. Download Citation
Author(s):
William E. Cliff, Jonathan M. Lawrence, Bradley E. Heinrichs, Travis R. Fricker
Affiliated:
MacInnis Engineering Associates
Pages: 12
Event:
SAE 2004 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Accident Reconstruction 2004-SP-1873
Related Topics:
Computer simulation
Yaw
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