Effect of Traction/Braking Loads and Complex Adhesion Conditions on Metro Wheel/Rail Interactions

doi:10.3901/JME.2023.12.284

Abstract

Abstract: Traction/braking efforts and wheel/rail adhesion conditions contribute greatly to wheel/rail dynamic interactions, especial for the tangential interactions. A metro vehicle-slab track spatial coupling dynamics model based on vehicle-track coupled dynamics theory was built in this paper. For the reason that the wheel/rail contact is essentially a non-Hertzian contact issue, a non-Hertzian wheel/rail normal contact algorithm and related non-Hertzian wheel/rail creep model considering the yaw angle of wheelset is applied in the coupled dynamics model. The wheel/rail dynamic interactions with different traction/braking loads and wheel/rail adhesion conditions are discussed by using the performed dynamics model. The simulation results indicate that the traction/braking loads and wheel/rail adhesion conditions have a significant effect on wheel/rail shear stress and adhesion-slip distribution characteristics, in which the wheel/rail shear stress increases and the area of adhesion region reduces with the increase of the traction/braking loads. The adhesion-slip distributions are basically full-slip with large traction/braking loads and low-adhesion contact conditions. The abnormal wheel/rail surface wear and profile optimization design can be further researched based on this simulation results.

Key words: metro vehicle, vehicle-track coupled dynamics, non-Hertzian contact model, traction/braking loads, complex adhesion conditions, wheel/rail dynamic interactions

CLC Number:

TG156

YANG Yunfan, LING Liang, ZHANG Tao, WANG Kaiyun, ZHAI Wanming. Effect of Traction/Braking Loads and Complex Adhesion Conditions on Metro Wheel/Rail Interactions[J]. Journal of Mechanical Engineering, 2023, 59(12): 284-296.

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