Browse Publications Technical Papers 2004-01-1187
2004-03-08

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.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Validation of the Circular Trajectory Assumption in Critical Speed

2005-01-1189

View Details

TECHNICAL PAPER

A Study of Errors in Yaw-Based Speed Estimates Due to Effective Braking

2003-01-0888

View Details

TECHNICAL PAPER

How to Use PC-CRASH to Simulate Rollover Crashes

2004-01-0341

View Details

X