Study on the mechanism of the formation of polygon-shaped wheels on subway vehicles

This paper discusses the mechanism responsible for the formation of polygon-shaped wheels; the aim is to solve the problem of their occurrence on subway vehicles. This phenomenon occurs mainly as a result of wheel/rail vertical forces created by the vibration of the wheelset over several complete revolutions of the wheel. In addition, a relationship linking the phase angle between two adjacent vertices, the main vibration frequency and running speed of the polygonal wheel is derived. Then, considering a subway vehicle that is powered by a linear induction motor and applying the multi-body system dynamics model, the main frequency of the wheel/rail vertical force under various running speeds is investigated. Analysis of the speed and main frequency value of a subway vehicle covered in this study revealed that a polygonal wheel with nine vertices can be generated in the speed range 72 to 80 km/h.

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