TECHNIQUES TO ANALYZE VEHICLE COASTDOWN DATA
Vehicle coastdown tests have been used for some time to generate data for estimating aerodynamic drag and tire rolling resistance. In spite of the numerous methods and techniques written up in the literature. The data taken do not represent measurements of the parameters of interest, rather, these parameters must be estimated from the measured data using some type of parameter estimation methodology. A method is presented which uses least squares parameter estimation techniques to estimate the aerodynamic drag and rolling resistance coefficients from velocity versus time data taken during the coastdown. Central to any parameter estimation problem is a model of the process that contains the parameters of interest. A model is developed to describe the coastdown process, and an example problem presented to show the computational methods developed for the data reduction process.
EG and G Idaho, IncorporatedP.O. Box 1625
Idaho Falls, ID United States 83401
- Venhuizen, J R
- Publication Date: 1984-10
- Pagination: 41 p.
- TRT Terms: Aerodynamics; Coefficients; Data analysis; Drag; Estimating; Mathematical analysis; Rolling resistance; Vehicle tests
- Subject Areas: Highways; Vehicles and Equipment; I91: Vehicle Design and Safety;
- Accession Number: 00393990
- Record Type: Publication
- Source Agency: Energy Research Abstracts
- Report/Paper Numbers: EGG-ED-6725
- Contract Numbers: AC07-76ID01570
- Files: TRIS
- Created Date: Jun 30 1985 12:00AM