风-车-桥系统空间耦合振动研究

3-D COUPLED VIBRATION OF WINDVEHICLEBRIDGE SYSTEM

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。

In a wind-vehicle-bridge system, wind is regarded as a stationary stochastic process, mass-spring-damper model is adopted for the vehicle, and finite element model is adopted for the bridge. Fluid-solid 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 three-dimensional dynamic model of the wind-vehicle-bridge 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 self-developed software, BANSYS, the Nanjing Yangtze River Bridge on the Peking-Shanghai high speed railway is analyzed to illustrate the vibration charaeteristies of the WVB system.