Keywords: EMU trains, hollow worn tread, stability, equivalent conicity, critical speed.

In order to investigate the influence of the hollow worn tread on vehicle stability during the operation of a certain type of high-speed EMU, a rigid-flexible coupling vehicle dynamic model considering the hollow worn tread is established, in which the elasticity of the frame and the carbody is considered. The hollow worn width, hollow worn depth and hollow worn position are proposed as parameters to define the hollow worn of tread, and the distribution curve of tread wear is accurately fitted according to these three parameters. The influence of the hollow worn parameters on the equivalent conicity, the critical speed and the lateral vibration acceleration of the frame and stability is investigated through simulation analysis. The results show that hollow worn width and hollow worn depth have a greater influence on the equivalent conicity, and that the equivalent conicity will gradually stabilise with the development of hollow worn. The influence of hollow worn depth on vehicle stability is greater than the other two parameters, and the influence is opposite before and after the inflection point (hollow worn depth is 1mm). The greater the width of the hollow worn, the better the stability of the vehicle, which demonstrates that lateral uniform wear on the tread can improves stability. This study can provide an empirical reference for the estimation of the equivalent conicity and the assessment of vehicle stability under hollow worn tread condition.

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