Study on thermo-mechanical coupling model in pantograph-catenary system of rail vehicle

Abstract

Abstract The coupling of the pantograph-catenary system represents a complex multi-disciplinary challenge, intertwining multi-fields and intricate interactions. Based on thermodynamic theory, this paper establishes a thermal-force coupling model for the pantograph carbon slider of high-speed trains, taking into account multiple physical field factors such as heat, dynamics, and electricity. Utilizing a pantograph-catenary contact test bench, we validate a full-scale thermo-mechanical coupling model for the pantograph carbon slider. Thereafter, we assess the coupled temperature and stress outcomes of the carbon slider. The results indicate that dynamic variations in the surface temperature of the carbon slider could lead to the formation of localized high-temperature zones. The phenomena of thermal expansion and contraction, combined with heat accumulation, increase the risk of thermal stress cracks and carbon strip fractures. Longitudinal reverse heat warping deformation occurs in the carbon strip. The airway of the aluminum bracket experiences the highest coupled stress and requires enhanced load-bearing capacity.