Effect of Driven Modes on Metro Wheel/rail Interactions under Complex Wheel/rail Friction Conditions
Metro trains are commonly driven by the linear induction motors(LIM)or rotary motors(RM).The LIM and RM metro vehicle-track coupled dynamic models are respectively established,in which the wheel/rail non-Hertzian rolling contact is performed with consideration of spatial vibrations of wheelsets and rails.The wheel/rail frictional contact under changeable friction conditions with respect to the metro vehicles with different driving modes is systematically compared.The numerical investigations suggested that the traction loadings have a significant effect on wheel/rail tangential interactions of the RM vehicle,which however,contribute little to the wheel/rail tangential interactions of the LIM vehicle.The anti-slip controllers of the RM vehicles will be triggered when the powered wheelset enters into the low-adhesion zones,and the wheel/rail contact is full-slip under this case.On the other hand,the wheel/rail contact of the LIM vehicles is prone to be locally slipping with low-friction adhesion conditions.Moreover,the wheel/rail frictional wear of the RM vehicles is clearly higher than that of the LIM vehicles under complex friction conditions due to the lower level of frictional contact.
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