Vehicle Coastdown Resistance Analysis Under Windy and Grade - Variable Conditions

890371

02/01/1989

Event
SAE International Congress and Exposition
Authors Abstract
Content
A testing and analysis method has been developed for the evaluation of the aerodynamic and rolling resistance coefficients of a vehicle, under windy weather conditions and on a road with some variation in grade. Over 100 coastdown runs have been collected and analyzed for the Transport Canada Nexus research prototype. Aerodynamic and rolling resistance functions have been found for the test vehicle for conditions from zero to over 30 degrees yaw, noting a characteristic in which aerodynamic drag decreases with yaw angle for Nexus. In addition, the effects of vehicle centripetal force due to road curvature in the vertical plane, lift force, velocity dependencies of rolling circumference and rolling resistance are discussed, and all are found to be negligible. The data analysis method developed, uses a computer-based simulation/optimization technique, which is described. This new resistance analysis technique will enable vehicles to be studied under typical non-ideal road and weather conditions.
Meta TagsDetails
DOI
https://doi.org/10.4271/890371
Pages
14
Citation
Remenda, B., Krause, A., and Hertz, P., "Vehicle Coastdown Resistance Analysis Under Windy and Grade - Variable Conditions," SAE Technical Paper 890371, 1989, https://doi.org/10.4271/890371.
Additional Details
Publisher
Published
Feb 1, 1989
Product Code
890371
Content Type
Technical Paper
Language
English