Abstract
A quicker method for calculating the likelihood of flange-climb derailment is proposed in this paper. This method uses analytically calculated lateral and vertical wheel loads based on analytic equations and measured data. The traditional derailment coefficient, lateral force divided by wheel load, also known as Q/P in Japan, takes too long to estimate with time-series computer simulations. This research evaluates equations developed to estimate Q/P more rapidly. Among the elements are: the effect of centrifugal force on wheel load and the effects of track twisting and shifting among others. The calculation that is proposed considers wheel flange angle, equivalent friction coefficient and the wheel's angle of attack. More work needs to be done to refine the method and expand it to more situations. This calculation is only for bolster-less bogies with air spring secondary suspension.
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