地铁钢轨短波长波磨作用下弹条断裂有限元分析
关庆华1张晗1焦朋宇2李伟1赵阳2尼垒2李冰冰2
Finite Element Analysis of Metro Rail Clip Spring Bar Fracture under Short-wavelength Corrugation
GUAN Qinghua1ZHANG Han1JIAO Pengyu2LI Wei1ZHAO Yang2NI Lei2LI Bingbing2
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作者信息:1.西南交通大学轨道交通运载系统全国重点实验室， 610031， 成都
2.郑州地铁集团有限公司， 450007， 郑州
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Affiliation:1.State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, 610031, Chengdu, China
2.Zhengzhou Metro Group Co., Ltd., 450007, Zhengzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20230496
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中图分类号/CLCN:U213.5
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栏目/Col:土建工程
摘要:
［目的］为了降低弹条失效对地铁列车运行安全的影响，对钢轨短波长波磨作用下弹条服役性能的影响进行研究，并探讨改进措施。［方法］针对某城市地铁线网的扣件服役问题展开现场调研，对弹条式扣件的病害形式及发生概率进行总结，并对易发病害的线路特征进行讨论。建立DT-Ⅲ型扣件精细化有限元模型，计算弹条振动模态，并分析安装状态下弹条的最大应力位置。［结果及结论］在正常服役状态下，弹条的显著等效应力均出现在小圆弧内侧，分别靠近弹条中肢连接处和铁垫板位置。在安装状态下，弹条的一阶固有频率为642 Hz，该频率与轨面实测波长为32 mm波磨的通过频率重合；弹条的第一主拉应力最大值出现在弹条中肢连接位置的小圆弧内侧，与现场弹条断裂位置一致。因此，短波长波磨为诱发弹条断裂的主要因素。建议对波长30～50 mm的波磨进行严格控制，以改善弹条服役条件。
Abstracts:
［Objective］ To reduce the impact of rail clip spring bar failure on metro train operation safety, the effect of short-wavelength corrugation on the service performance of rail clip spring bars is investigated and improvement measures to mitigate the clip defects are explored. ［Method］ Field survey is conducted focusing on the rail clip spring bar service conditions in an urban metro network, the failure modes and occurrence probability of rail clip spring bars are summarized, and the line characteristics prone to such failures are analyzed. A refined finite element model of the DT-III fastener is developed to calculate the vibration modes of rail clip spring bars and the maximum stress location under installation conditions. ［Result & Conclusion］ Under normal service conditions, significant equivalent stresses of the rail clip spring bars are located on the inner side of the small arc, near the middle limb connection and the iron baseplate respectively. In the installed state, the first-order natural frequency of rail clip spring bars is 642 Hz, which coincides with the passing frequency corresponding to the measured rail corrugation wavelength of 32 mm. The maximum first principal tensile stress occurs on the inner side of the small arc at the middle limb connection of the rail clip spring bar, which is consistent with the actual fracture position observed in the field. Therefore, the short-wavelength corrugation is identified as the main factor introducing rail clip spring bar fracture. It is recommended to strictly control the corrugation within the wavelength range of 30-50 mm to improve the service conditions of rail clip spring bars.
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