列车-桥梁-汽车耦合振动仿真分析

Simulation and analysis on coupled vibration of train-bridge-road vehicle system

用多刚体系统模拟列车、汽车车辆,用空间梁单元、杆单元模拟桥梁。采用密贴假定及蠕滑理论处理轮轨接触关系,设汽车轮胎与公路桥面为点接触且不分离建立列车-桥梁-汽车耦合振动分析模型,编制仿真分析软件。以某公路、铁路两用桥为例进行列车-桥梁-汽车耦合振动分析。结果表明,列车与汽车同时上桥且随汽车数量增多,列车机车及车辆的竖向加速度、脱轨系数、轮重减载率最大值明显增大,汽车对列车运行安全性具有不利影响。

A dynamic analysis model of coupled train-bridge-road vehicle system was established,in which the trains and road vehicles were modeled by multi-rigid-body system,the bridge was modeled by spatial beam and bar elements,the wheel-rail corresponding assumption and the creep theory were used to deal with the wheel-rail contact relationship,and the bridge deck and the vehicle tires were assumed to be in point-contact and without separation.A computer simulation code was developed.With a rail-cum-road bridge as an example,the coupled vibration responses of the train-bridge-road vehicle system were analyzed.The results show that when trains and road vehicles pass the bridge simultaneously,with the increase of the quantity of vehicles,the maximum vertical acceleration,derailment factor and offload factor of the trains are significantly increased,showing an adverse influence of road vehicles on the running safety of trains.