Keywords: high-speed trains, vehicle system dynamics, rolling radius difference function, wheel wear, wheel diameter difference.

Wheel profiles are tested to study the changes of the shape and position of rolling radius difference function affected by wheel wear and diameter difference. The dynamic model of high-speed train is built to calculate the nonlinear critical speed, stability and curve passing performance under different worn profile and diameter conditions. The relationship between rolling radius difference function and vehicle dynamics is described by calculation of the equilibrium point of straight and curve passing conditions. Analysis shows that wheel wear and diameter difference would cause a significant decrease of vehicle system dynamics though the change of the shape and position of rolling radius difference function. Calculation results showed that the critical speed on straight line declined from 530km/h to 350km/h of profile S3 and 300km/h of profile S5 when wheel diameter is zero. At the same time, the riding index increases from 1.6 to 1.87. As wheel diameter changes from -0.5mm to 0.5mm, the critical speed declines about 80km/h while the riding index increases 0.1. At curve passing conditions, vehicle dynamic performances deteriorate as the wheel wear developed. The wheel/rail lateral forces increased by 3-6kN. The derailment coefficient increased from 0.1 to 0.25. The Elkins wear index increased from 0.004 to 0.015. As the wheel diameter changes from -0.5mm to 0.5mm, vehicle dynamic performances meliorated. The wheel/rail lateral forces decreased from 6kN to 16kN. The derailment coefficient decreased from 0.03-0.1. The Elkins wear index decreased from 0.003-0.01.

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