摘要
对于时速160 km,轴重17 t运营条件下的市域浮置板轨道列车平稳过渡问题,设计人员提出一种设置钢轨预拱值的钢弹簧浮置板新型过渡段方案。本文建立三维列车−轨道−过渡段耦合模型来验证该设计方案下列车通过时的轨面平顺性,研究在160 km/h速度下车辆和轨道结构的动力响应规律,并对过渡段预拱值、合理长度以及扣件垂向刚度过渡方案进行分析。结果表明,在市域铁路非减振地段至浮置板地段的轨道过渡段设置预拱值可以有效提高列车通过时的轨面平顺性,降低列车和轨道动力响应,提高列车运行舒适性。本文过渡段长度设置无过渡段,13.2,19.8,26.4和33 m共5种工况。通过计算可知,设置过渡段后能有效降低列车动力响应,降低钢轨轨面变化率。随着过渡段长度的增加,钢轨轨面变化率逐渐减小,轨面平顺性增加。在19.8 m工况下,车体垂向加速度、轮轨垂向力及预拱过渡段和钢弹簧浮置板段交界处的钢轨垂向加速度均达到最小值,为4种工况的较优解。通过高斯函数拟合,对浮置板过渡段扣件垂向刚度过渡方案进行优化设计,从线性过渡改为非线性过渡,非线性过渡方案下的钢轨轨面变化率降低效果显著,比线性过渡更能保证列车通过过渡段时的轨面平顺性。
For the smooth transition of urban floating slab track trains with a speed of 160 km/h and an axle load of 17 tons,the designers proposed a new transition section scheme of steel spring floating slab with rail pre camber value.In this paper,a three-dimensional train track transition coupling model was established to verify the smoothness of the rail surface when the train passes under the design scheme.The dynamic response law of the vehicle and track structure at the speed of 160 km/h was studied.The pre camber value,reasonable length and vertical stiffness transition scheme of the transition section was analyzed.The results show that setting the pre camber value in the transition section of the track from the non-vibration-damping section to the floating slab section of the city railway can effectively improve the smoothness of the track surface when the train passes,reduce the dynamic response of the train and the track,and improve the comfort of the train.In this paper,the length of transition section is set without transition section,13.2,19.8,26.4 and 33 m.The calculation shows that the dynamic response of the train and the change rate of rail surface can be effectively reduced after setting the transition section.With the increase of the length of the transition section,the rail surface change rate gradually decreases,and the rail surface smoothness increases.Under the working condition of 19.8 m,the vertical acceleration of the car body,the vertical force of the wheel rail and the vertical acceleration of the rail at the junction of the pre camber transition section and the steel spring floating plate section all reach the minimum value,which is the better solution of the four working conditions.Through Gaussian function fitting,the vertical stiffness transition scheme of fasteners in the transition section of floating plate is optimized,which is changed from linear transition to nonlinear transition.The rail surface change rate under the nonlinear transition scheme is significantly reduced,which can bett
作者
李秋义
周智强
黄绮淇
王品皓
李勇江
孙渊冰
LI Qiuyi;ZHOU Zhiqiang;HUANG Qiqi;WANG Pinhao;LI Yongjiang;SUN Yuanbing(China Railway Fourth Survey and Design Institute Group Co.,Ltd.,Wuhan 430063,China;Hubei Key Laboratory of Railway Track Security Service,Wuhan 430063,China;Key Laboratory of High-speed Railway Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2023年第7期2479-2487,共9页
Journal of Railway Science and Engineering
基金
中铁第四勘察设计院集团有限公司科研课题(2020K028)
国家自然科学基金资助项目(51978584)。
关键词
装配式浮置板
预拱值
过渡段
动力学响应
扣件刚度优化
assembled floating slab
camble
transition section
dynamic response
fastener stiffness optimization
