车辆-高架桥耦合系统竖向振动分析车辆轨道新模型

A New Track Model for Vertical Vibration Analysis of Vehicle-Ballastless Track-Bridge Coupling

针对CRTS Ⅱ型无砟轨道-桥梁轨道结构的特点,建立了列车-无砟轨道-桥梁耦合振动新模型。整个系统离散成一个多节点的轨道单元和具有二系悬挂的动轮单元,基于有限元方法和Lagrange方程,建立列车-无砟轨道-桥梁时变系统竖向振动方程。该模型具有程序编制容易、计算效率高的特点。作为应用实例,计算得出了两车通过时随机不平顺条件下轨道桥梁结构的动力特性,说明新模型正确可行。

Based on the structural characteristics of the CRTS II ballastless track-bridge system,a new model of vehicle-track-bridge coupling vibration is presented.The system is firstly separated into driven wheel element and a single＂four layer beam＂element.Then the vertical vibration equation of the vehicle-ballastless track-bridge time-dependent system is established by means of finite element method and Lagrange equation.The proposed model has advantages of convenience for programming and high efficiency for computing.The vertical displacements are obtained by assuming the pure smooth rail.The comparison between the result and reference shows the correctness and feasibility of the new model.As an application,the vibration characteristics of the track bridge structure are calculated under random irregular conditions.