Research on Instability Principle of Virtual Tracks Train When Braking on Curve

Abstract Virtual tracks train is a new type of rail transit, which combines traditional rail vehicles and road vehicles. In order to study the effect of braking on the stability of virtual tracks train on curve, a four-axle model with train body model, steering model, braking model and tire model was built in Matlab/Simulink to research the change of yaw velocity, lateral acceleration and vehicle speed when it brakes on curve. Through step steering test of the vehicle, the model was verified to analyze the braking stability on steady steering condition. Simulation result shows that when virtual tracks train brakes after 8s of turning with an individual axle locking up, different instability phenomena such as loss of guidance capacity, folding and drifting, would occur, which leads to instability of braking on curve. Using ABS can help improve the stability of it. With the instability principle put forward through the simulation, brake system and brake force distribution law could be designed to meet the need of virtual tracks train.