不同环境温度下弓网系统热力耦合研究
姜杭艳周宁高海翔李牧迪罗建伟张卫华
Thermo-mechanical Coupling of Pantograph-Catenary System under Different Ambient Temperatures
JIANG HangyanZHOU NingGAO HaixiangLI MudiLUO JianweiZHANG Weihua
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作者信息:西南交通大学轨道交通运载系统全国重点实验室， 610031， 成都
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Affiliation:State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, 610031, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20231268
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中图分类号/CLCN:TM922.6; TM922.5
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栏目/Col:供电与能源
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。
Abstracts:
［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.
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