风-车-桥系统空间耦合振动研究

风-车-桥耦合振动系统中将自然风作为空间相关的平稳随机过程,车辆采用质点-弹簧-阻尼器模型,桥梁采用有限元模型。在分析风桥间的流固耦合作用、车桥间的接触耦合作用及风对车辆的空间脉动作用的基础上,将风、车、桥三者作为一个交互作用、协调工作的耦合动力系统,提出了一种较为完善的风-车-桥系统空间耦合振动分析模型。基于轮轨接触点处的几何协调条件和力学平衡关系,建立了系统运动方程的分离迭代求解算法。最后以京沪高速铁路南京大桥为工程背景,采用自行研发的桥梁结构分析软件BANSYS对比分析了风-车-桥系统振动特点。

3-D COUPLED VIBRATION OF WIND-VEHICLE-BRIDGE SYSTEM

In a windvehiclebridge system,wind is regarded as a stationary stochastic process,massspringdamper model is adopted for the vehicle,and finite element model is adopted for the bridge.Fluidsolid coupling between wind and bridge,contact coupling between vehicle and bridge,and stochastic action of wind on the vehicle are analyzed.Wind,vehicle and bridge can be regarded as a coupled vibration system.A novel threedimensional dynamic model of the windvehiclebridge system is presented in this paper.Based on the geometric and mechanical coupling relation shipe at the contact point of wheel and rail,a separated iterative procedure is developed to solve the kinematic equation of the WVB system.Using a selfdeveloped software,BANSYS,the Nanjing Yangtze River Bridge on the PekingShanghai high speed railway is analyzed to illustrate the vibration characteristies of the WVB system.