車輪・レール摩耗の影響を考慮した外軌側車輪フランジ部の摩擦係数の推定方法

抄録

The running safety of a railway vehicle against flange-climb derailment is evaluated with the derailment coefficient. Continuous observation of the derailment coefficient during commercial operation has been conducted with the monitoring bogie. However, the critical derailment coefficient is determined by the friction coefficient between the leading outside wheel flange and rail, which changes due to wayside rail lubrications. The present study proposes an estimation method of the friction coefficient of the leading-outside wheel flange utilizing the multibody dynamics simulation. Look-up tables, which show the relationship between the given friction coefficients and the calculated wheel/rail contact forces, are created from the results of simulation in sharp curves. The friction coefficient of the outside wheel can be regressively estimated by inputting the measured contact forces collected with the monitoring bogie into the look-up table. This paper also considers the influence of wheel/rail profiles on the proposed method and presents a modified look-up table made from simulations with the measured wheel/rail worn profiles.