线路随机不平顺对车辆-轨道耦合系统动力响应分析

Analyses of Dynamic Response of Vehicle and Track Coupling System with Random Irregularity of Rail Vertical Profile

利用有限元法 ,建立了车辆 轨道耦合系统动力计算模型。在这个模型中 ,系统被分解为上部结构和下部结构两部分。上部结构为附有二系弹簧系统的整车模型 ,考虑车体和转向架的沉浮振动和点头振动。下部结构为轨道 ,钢轨被离散为双层弹性基础上有限长度的梁。对两系统分别用迭代法单独求解。轮轨间的耦合通过轮轨间的相互作用力来实现。同时 ,将轨道高低不平顺视为平稳各态历经随机过程。运用该模型 ,对不同线路等级和不同列车速度条件下车辆 轨道系统的垂向随机振动做了计算 。

Dynamic computational model for vehicle/track coupling system is developed by means of a finite element method, where the vehicle and track coupling system is divided into two parts, upper structure and lower structure. Vehicle as upper structure in the coupling system is a whole locomotive or rolling stock with two layers of spring and damping system in which vertical and rolling motion for vehicle and bogie are concerned. The lower structure in the coupling system is railway track where rails are considered as beams with finite length rested on double layer continuous elastic foundation. The two parts are solved independently with iterative scheme. Coupling the vehicle system and railway track is realized through interaction forces between wheels and rail in which the irregularity of track vertical profile considered as stationary ergodic Gaussian random processes and simulated by trigonometry series is included. Using this model, the vertical random vibration of vehicle/track system under conditions of different railway line orders and different train speeds is computed. Analyses of system responds are performed in the time and frequency domains.