Freight container wagon modelling and simulation analysis due to braking

To improve the wagon brake performance and to investigate the wheel skidding on the rail during braking, the comprehensive rail freight wagon models with consideration of braking are generated by using the Gensys software package, which includes the masses of a wagon carbody, two bolsters, four sideframes, eight axle boxes and eight wheelsets. The nonlinear characteristics of secondary and the primary suspensions are considered among the mass connections. The tangential wheel-rail contact creepages and creep forces are calculated by a modified FASIM method with consideration of decreasing changes after saturation points. The brake type of air-pressed friction shoe on wheel tread surface is taken into account and the reference brake force profiles are considered with the characteristics of increasing friction coefficient with wagon speed decreasing. The wagon rolling resistance is also considered by using the equations used in Australian rail industries. The wagon braking stopping distance at an operation speed and the wheel slipping and skidding during braking situations can be simulated, and the effect of wheel-rail surface conditions (dry, wet, low coefficient friction (LCF) modifier and grease), wagon loading distribution, etc., to the braking performance can be examined, and the discussions on the wagon braking operation are given.