Curving Simulation of Four Axle Railway Vehicles with Conventional Two Axle Bogies

We have developed a dynamic model for curving of four axle rail vehicles with conventional two axle bogies, and derived equations of its motion. Then some digital simulations were made to obtain time history of rail/wheel vertical and lateral forces during curving. In case of an ordinary truck, it was shown that it runs on curved tracks with its outer rail side wheel of the front axle slipping between the flange and the rail, as is well known. However, slipless curving is achieved by a proper selection of parameters. This simulation has been also applied to those cases where dynamic coupler forces were applied, and there was a lateral rail irregularity.