摘要
针对地铁曲线线路中出现的钢轨波磨现象,基于地铁小半径曲线轨道上轮轨间蠕滑力饱和引起轮轨系统摩擦自激振动从而导致钢轨波浪形磨耗的理论,借助有限元方法,建立不同扣件类型的轮轨系统接触模型,并采用复特征值方法研究在车辆通过小半径曲线线路时轮轨系统的稳定性,研究不同扣件模拟方式及刚度对钢轨波磨的影响。对比计算结果可以发现:相比于使用弹簧阻尼单元,采用实体单元模拟扣件的模型结果更贴近现场数据;在轨下垫板与钢轨分别设置接触和固定连接的模型中,接触模型的仿真结果更加理想。由此可见,研究钢轨波磨时,接触模型是一种较为可取的仿真方式;一定范围内改变扣件的刚度对摩擦自激振动产生时对应频率的大小影响甚微,但扣件的垂向刚度值过小会使波磨现象更加严重。
Considering the rail corrugation ofsubway curve track, three different wheelset-railmodels are established by utilizing FEM based onthe theory that saturated wheel-rail creep force induces frictional self-excited vibration and results in rail corrugation of metro tight curve track. Themotion stability of the wheelset-rail system is studied by exploiting the complex eigenvalue method toresearch the influence of different fastener parameters and vertical stiffness on rail corrugation when avehicle negotiates a tight curve track. Results show that solid element used in the simulation model is ableto simulate rail corrugation better than the spring-damper pairs. In comparison with the model of rail padwith fixed connection, the model of rail with contact connection is better to simulate rail corrugation,which shows that the contact-model is advisable in the rail corrugation research. Variations of fastenerstiffness in a certain range have little impact on frequency of the frictional self-excited vibration.Nevertheless, the corrugation is more serious when vertical fastener stiffness is too small.
作者
赵江伟
赵晓男
陈光雄
欧阳华江
崔晓璐
ZHAO Jiang-wei;ZHAO Xiao-nan;CHEN Guang-xiong;OUYANG Hua-jiang;CUI Xiao-lu(Tribology Research Institute,School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2018年第12期6-10,共5页
Railway Standard Design
基金
国家自然科学基金项目(51775461)
