某型地铁接地线端子开裂故障
李文学1屈升2戴鑫亮2
Cracking Faults in Grounding Terminals of a Specific Metro Train Model
LI Wenxue1QU Sheng2DAI Xinliang2
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作者信息:1.中车长春轨道客车股份有限公司，130062，长春
2.西南交通大学牵引动力国家重点实验室，610031，成都
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Affiliation:1.CRRC Changchun Railway Vehicles Co., Ltd., 130062, Changchun, China
2.State Key Laboratory of Traction Power, 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.2024.12.054
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中图分类号/CLCN:U279
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栏目/Col:应用技术
摘要:
［目的］由于某型地铁列车在运行过程中频繁出现接地端子开裂故障，因此有必要针对该型地铁列车接地端子开裂的故障原因进行分析。［方法］在故障路段进行线路试验，通过采集相关部件的振动加速度及应力信号，研究不同信号的时频特征，分析接地端子的开裂原因。通过分析不同支架与不同线缆截面匹配时接地端子的动应力变化情况，对不同结构线缆支架的适配性进行评估，分析3个不同位置（接地轴端、速度轴端、防滑轴端）的端子支架选取方案。［结果及结论］在相同外载荷下，短臂支架应力较小；新接地端子在结构设计上优于原接地端子；新接地端子的疲劳寿命高于原接地端子。
Abstracts:
［Objective］ Frequent cracking faults are observed in the grounding terminals of a specific metro train model during operation. Therefore, it is essential to analyze the grounding terminal cracking causes of the train in the above case. ［Method］ Line tests are conducted on faulty sections. Through collecting vibration acceleration and stress signals from relevant components, the time-frequency characteristics of different signals are studied, and the grounding terminal cracking causes are analyzed. Through analyzing the dynamic stress variations of the grounding terminals with different bracket and cable cross-section combinations, the compatibility of various structural cable brackets is evaluated. Terminal bracket selection schemes of three positions (grounding shaft end, speed shaft end, and anti-slip shaft end) are analyzed. ［Result & Conclusion］ Under identical external loads, the short-arm brackets exhibit lower stress levels. The new grounding terminals demonstrate superior structural design compared to the original grounding terminals, and the fatigue life of the former is higher than that of the latter.
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