摘要
小半径曲线段钢轨廓形质量对轮轨接触关系及钢轨使用寿命有着关键影响。为探究个性化打磨对小半径曲线段磨耗廓形的轮轨接触改善及延长钢轨使用寿命效果,选取沪昆普速铁路小半径曲线段两组磨耗钢轨进行打磨方案研究;基于现场实测数据及病害分析,与消除表面病害为目的的修复性打磨方案作比较,对钢轨进行个性化打磨廓形设计;跟踪观测钢轨表面状态,结合GQI(grinding quality index)及轮轨接触分析,建立车辆-轨道动力学模型计算打磨方案对轮轨动力特性的影响,综合评价打磨效果;结果表明:修复性打磨仅对钢轨表面病害进行处理,并未实际改善轮轨关系,廓形保持能力不佳,后续动力学指标评价也无明显改善;相比之下,个性化打磨廓形保持能力更佳,GQI指数明显提升,轮轨关系改善显著,提高了车辆曲线通过能力;动力学方面,个性化打磨方案的轮轨横、纵向蠕滑率和磨耗指数分别降低60.45%,33.95%和24.13%,有效缓解了轮轨间的磨耗,延长了钢轨使用寿命与打磨周期;车体横向、垂向加速度和脱轨系数分别降低19.69%,30.74%和26.11%,列车运行平稳性得到良好改善,提高了列车运行安全性。由此可见,个性化打磨方案在清除小半径曲线段磨耗钢轨病害的基础上,延长了钢轨服役周期,同时提高了列车运行品质。
The quality of rail profile in the small radius curve section has a key influence on the wheel-rail contact relationship and the rail service life.In order to explore the effect of personalized grinding schemes on the wheel-rail contact improvement and the rail service life extension of the wear profile in the small radius curve section,two groups of wear rails in the small radius curve section of Shanghai—Kunming ordinary speed railway were selected for grinding scheme research.Based on the field measured data and disease analysis,compared with the reparative grinding scheme for the purpose of eliminating surface problems,the personalized grinding profile of the rail was designed.The rail surface state was tracked and observed.Combined with grinding quality index(GQI)index and wheel-rail contact analysis,a vehicle-track dynamic model was established to calculate the influence of grinding scheme on wheel-rail dynamic characteristics,and the grinding effect was comprehensively evaluated.Results show that the reparative grinding only deals with the rail surface diseases,and does not actually improve the wheel-rail relationship.The profile retention ability is not good,and the subsequent dynamic index evaluation is not significantly improved.In contrast,the personalized grinding profile retention ability is better,the GQI index is significantly improved,the wheel-rail relationship is significantly improved,and the vehicle curve passing ability is improved.In terms of dynamics,the lateral and longitudinal creep rates and wear index of the personalized grinding scheme are reduced by 60.45%,33.95%,and 24.13%,respectively,which effectively alleviates the wheel-rail wear and prolongs the rail service life and grinding cycle of the rail.The lateral and vertical acceleration and derailment coefficient of the car body are reduced by 19.69%,30.74%,and 26.11%,respectively.The running stability of the train and the safety of the train operation were improved.It can be seen that the personalized grinding scheme prolongs the r
作者
张斌
汪龙洋
杨宗超
孙奇
万文超
汤金伟
ZHANG Bin;WANG Longyang;YANG Zongchao;SUN Qi;WAN Wenchao;TANG Jinwei(State Key Lab of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;Engineering Research Center of Railway Environmental Vibration and Noise,Ministry of Education,East China Jiaotong University,Nanchang 330013,China;China Railway Materials Operation and Maintenance Technology Co.,Ltd.,Beijing 100036,China;China Railway Nanchang Bureau Group Co.,Ltd.,Nanchang 330002,China;Huizhou Track Maintenance Department of China Railway Guangzhou Bureau Group Railway Co.,Ltd.,Huizhou 516000,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第24期169-174,184,共7页
Journal of Vibration and Shock
基金
江西省重点研发计划“揭榜挂帅”项目(20223BBE51009)
国家自然科学基金(52178430,52108406)
江西省研究生创新专项资助项目(YC2021-S445)。
关键词
小半径曲线
钢轨打磨
轮轨接触特性
车辆轨道动力学
钢轨磨耗
small radius curve
rail grinding
wheel-rail contact characteristics
vehicle track dynamics
rail wear
