Evaluation of Vehicle Drag Parameters From Coastdown Experiments Conducted Under Nonideal Environmental Conditions

[+] Author and Article Information
H. H. Korst, R. A. White

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, Ill. 61801

J. Fluids Eng 103(1), 133-140 (Mar 01, 1981) (8 pages) doi:10.1115/1.3240761 History: Received September 17, 1979; Online October 26, 2009


Parameter identification by optimization forms the analytical basis for extracting road load information from well controlled coastdown tests. Specific attention is given to the effects of both biased and random errors as may be caused by environmental disturbances, road conditions, inaccurate parameteric input, or signal and instrument noise. As a consequence, experimental conditions can be identified and quantitative criteria established for either avoiding or correcting such errors. Test results are presented which support the methodology and conclusions.

Copyright © 1981 by ASME
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