Study on wheel polygonization of a metro vehicle based on polygonal wear simulation

Abstract A long-term iterative wear model is proposed to predict the development of polygonal wear of railway wheels. To improve the simulation accuracy, the time step for numerical integration, wheel profile updating strategy and curve fitting methods are analysed. Then a metro vehicle with 8th to 9th order polygonal wheel is presented as a case study where a vehicle resonance speed leading to a peculiar growth of wheel polygonization is identified by simulation and validated through field tests. Based on the simulated polygonal wear evolutions and analyses on vehicle vibrations, the mechanism of wheel polygonization is explained. Finally, two new strategies to investigate wheel polygonization are proposed.

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