【摘要】 [目的]在极端的环境温度下，弓网接触区易出现温升过高、接触力波动加剧等问题。对此，有必要揭示不同环境温度下的弓网热力耦合效应，探究温度与应力演化规律。[方法]基于动力学和热力学理论，建立了一种考虑热、动力学和电等多物理场影响的弓网系统热力耦合模型，研究了环境温度对弓网系统热力耦合特性的影响。[结果及结论]碳滑板的稳态温度与环境温度呈正相关，总温升及稳态应力同环境温度呈负相关。环境温度每上升20℃,碳滑板碳条稳态温度增加12.6℃,温升减少7.4℃,稳态应力减少0.755 MPa。当环境温度为-60℃及90℃时，总温升分别可达到249.46℃和183.46℃。即使在低环境温度下，碳滑板表面的温度也会迅速上升至一个可能导致严重磨损的水平。更多还原

【Abstract】 [Objective] Under extreme ambient temperatures, issues such as excessive temperature rise and intensified contact force fluctuation readily occur in the PC(pantograph-catenary) contact zone. Therefore, it is necessary to reveal the thermo-mechanical coupling effects of the PC system under varying ambient temperatures and investigate the evolution law of temperature and stress. [Method] Based on dynamics and thermodynamics theories, a thermo-mechanical coupling model of the PC system considering multi-physical field influences(thermal, dynamics, and electrical) is established. The impact of ambient temperature on the thermo-mechanical coupling characteristics of the PC system is investigated. [Result & Conclusion] The steady-state temperature of carbon strip shows a positive correlation with ambient temperature, while its total temperature rise and steady-state stress exhibit negative correlations with ambient temperature. For every 20 ℃ increase in ambient temperature: the steady-state temperature of carbon strip increases by 12.6 ℃, the temperature rise decreases by 7.4 ℃, and; the steady-state stress decreases by 0.755 MPa. At ambient temperatures of-60℃ and 90℃, the total temperature rise reaches 249.46 ℃ and 183.46 ℃, respectively. Even under low ambient temperature conditions, the surface temperature of carbon strip can rapidly rises to a level that may cause severe wear.更多还原