This report investigates the analysis of vehicle coast-down results.
Two analytical models are investigated, and one is chosen as the basis
for a derivative based correction technique to account for changes in
the ambient conditions. A vehicle coefficient extraction algorithm,
based on a parameter optimization technique, is developed. A FORTRAN
program is developed to implement the correction and coefficient
extraction algorithms, and also to carry out a statistical analysis on
the extracted vehicle coefficients. The statistical analysis utilizes
'weights' (based on RHS curve fitting error) in order to account for
random error in the input coast-down data. An investigation into the
effect of measurement error on the extracted values of the coefficients
was carried out, and it was recomended that the vehicle speed and wind
velocity measurements should be improved. A large number of actual test
were obtained and analyzed, but the results were inconclusive, except
that it was clear that the measurement accuracy must be improved.
Finally, recomendations for future work were made based on experience
gained during the course of this work.
A Master's Thesis. Submitted in partial fulfilment of the requirements for the award of Master of Philosophy of Loughborough University.