北京地铁个性化钢轨廓形打磨技术应用效果分析
刘永乾1,2王军平1徐宁2郭贝侨1
Application Effect Analysis of Personalized Rail Profile Grinding Technology in Beijing Metro
LIU YongqianWANG JunpingXU NingGUO Beiqiao
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作者信息:1.中铁物总运维科技有限公司，100036，北京；
2.北京交通大学机械与电子控制工程学院，100044，北京
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Affiliation:China Railway Materials Operation and Maintenance Technology Co., Ltd., 100036, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2020.08.045
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中图分类号/CLCN:U216.42+4
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栏目/Col:应用技术
摘要:
针对北京地铁某半径350 m曲线段钢轨严重波磨和疲劳伤损的问题，采用个性化钢轨廓形打磨方法对其实施了打磨。打磨后利用实测车轮踏面、实测钢轨廓形、车辆及线路实际参数建立了车辆多刚体系统动力学模型，对打磨前后轮径差、轮轨接触几何关系、接触应力和磨耗指数等关键动力学参数进行了分析；在打磨后6个月时，对该曲线段的钢轨光带、波磨和疲劳伤损等进行了跟踪观测。仿真结果和观测结果表明：实施个性化钢轨廓形打磨后，各项车辆动力学指标明显改善，波磨超限率减少了80%以上、峰峰值最大降低90%，钢轨波磨和疲劳伤损发展得到明显抑制，光带宽度和位置保持良好，仿真结果与现场实测数据吻合良好。说明个性化廓形打磨可有效整治地铁小半径曲线钢轨波磨和疲劳伤损问题，延长钢轨使用寿命。
Abstracts:
To solve the serious rail corrugation and fatigue damage on a R350 m curve section of Beijing metro, the personalized rail profile grinding is implemented. Then, a vehicle\|railway system dynamics model is established after rail grinding by using the parameters of measured wheel tread, wheel profile, vehicle and rail line, the key dynamics parameters of wheel diameter difference, wheel rail contact geometry, contact stress and wear index before and after grinding are analyzed. The contact band, corrugation and fatigue damage of the curve rail are tracked and measured after 6 months of grinding. The results show that the vehicle dynamic indexes are significantly improved after the implementation of personalized rail profile grinding, the corrugation overrun is reduced by more than 80.1%, the corrugation peak-to-peak value is reduced by 90%, the development of rail corrugation and fatigue damage are obviously suppressed, the width and position of the light band are well maintained. Since the simulation results are in good agreement with the measured data, it shows that the personalize designed profile grinding could rectify the rail corrugation and fatigue damage on the small radius curve, and extend the rail service life effectively.
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