Analyses of dynamic behavior of track transition with finite elements
Analyses of dynamic behavior of track transition with finite elements
复制标题
DOI：
10.1177/1077546310385035
复制
发表时间：
2011-10-01
影响因子：
2.8
通讯作者：
Zhang, Bin
中科院分区：
文献类型：
--
作者：
Lei, Xiaoyan;Zhang, Bin
本文提出了新型车辆和轨道单元，用有限元法建立了车辆-轨道-路基耦合系统的动力分析模型。推导了这两类单元的刚度矩阵、质量矩阵和阻尼矩阵。计算软件用Matlab编写。作为应用实例，研究了车辆和轨道元件对轨道过渡的动力学行为的影响。模拟的影响因素包括列车速度、路基刚度、轨道过渡段不平顺角度以及过渡段型式。计算结果表明：1）路基刚度突变对钢轨竖向加速度和轮轨接触力有影响，且这种影响随列车速度的提高而增大; 2）轨道过渡段不平顺角和路基刚度突变对钢轨竖向加速度和轮轨接触力均有显著影响，在这种情况下的峰值大于由轨道过渡的不规则角或路基刚度的突变产生的峰值，3）列车速度，路基刚度的突变，轨道过渡段不平顺角对车辆垂向加速度的影响较小，从车辆一、二系悬挂系统的动力学特性来看，轨道不平顺的过渡模式对车辆加速度和轮轨接触力有显著影响，余弦过渡比线性过渡更能反映车辆的动力学特性;列车运行方向对车辆和轨道动力学特性的影响相对较小。
New types of vehicle and track elements are presented, by means of the finite element method, to establish a model for dynamic analysis of vehicle-track-subgrade coupling systems. The associated stiffness matrix, mass matrix and damping matrix for these two types of elements are deduced. Computational software is coded with Matlab. As an application example, the dynamic behavior of track transition is investigated by the vehicle and the track elements. The influencing factors for the simulation include train speed, subgrade stiffness, and irregularity angles of track transition as well as the transition pattern. The computational results show that 1) Abrupt changes of the subgrade stiffness influence the vertical acceleration of the rail and the wheel/rail contact force, and this influence increases with increases in train speed, 2) Both the irregularity angles of the track transition and the abrupt changes of the subgrade stiffness have significant effects on rail vertical acceleration and the wheel/rail contact force, with the peak value in this situation being greater than that generated by irregularity angles of the track transition or the abrupt changes of the subgrade stiffness, 3) Train speed, abrupt changes of the subgrade stiffness, and track transition irregularity angles have a minor influence on the vertical acceleration of the vehicle due to the excellent behavior of vibration isolation resulting from the primary and the secondary suspension systems of the vehicle, 4) Transition pattern for irregularity of track transition has a significant influence on the vehicle acceleration and the wheel/rail contact force, and the cosine transition is a much better indicator than the linear transition, and 5) Influences of the directions the train is moving on the dynamic behavior of the vehicle and the track are relatively insignificant.