Effect of wheel polygonal wear on dynamic responses of high speed train-track-bridge system

With the development of Chinese high-speed railway, wheel polygonal wear becomes an increasing serious problem. This paper presents a dynamic investigation into the influence of wheel polygonal wear on the high-speed train-track-bridge system. Primarily, based on the train-track-bridge dynamic interaction theory, a vertical coupled dynamic model consisting of high-speed train, ballastless track and simply supported girder bridge is built. On this basis, the influence of wheel polygonal wear is investigated by considering wheel polygonal wear as cyclical irregularities. In the dynamic investigations, two kinds of wheel polygonal wear are adopted, namely the simple harmonic model and the measured roundness of actual highspeed train wheels Results show that, with the order of polygonal wear increases, the amplitudes of the responses increase sharply in middle orders (from the 8th to the 17th order) and increase relatively slowly or even decrease in high orders (the 18th order and higher). The wheel polygonal wear results in serious increase of dynamic responses of vehicle, track and bridge.