地铁车辆连挂冲击非线性动力学模型

在考虑车钩缓冲器非线性刚度和阻尼、车辆轮轨之间摩擦力的情况下,建立编组列车连挂冲击的非线性模型。根据试验结果,确定了缓冲器的非线性刚度和阻尼,并将数值仿真结果与试验结果进行比较,证明了模型的正确性。使用数值仿真方法,分别研究六车编组、二车编组列车的连挂冲击特性。研究结果表明,车辆连挂碰撞时,冲击分界面处的缓冲器的冲击力、压缩行程最大;不同数量的车辆编组碰撞冲击时,最大冲击力不但存在差异,而且,缓冲器的压缩行程、吸收的能量也不相同;距离冲击分界面较远的车辆之间,可以配置容量较小的缓冲器。

Nonlinear Impacting Dynamic Model of a Metro Vehicle

In the case of the consideration of the nonlinear stiffness and damping of couplers and buffers,friction force between wheel and rail,the nonlinear dynamic impacting model of metro vehicle group is established.The nonlinear stiffness and damping of the buffer are determined by means of test.Simulation results of impacting characteristics between one vehicle and fixed body are verified by testing data.By numeric simulation,the impacting characteristics of two different metro vehicle groups are researched,in which there are 6 or 2 vehicles in every sub-group.It is found that when coupling impact between two vehicle groups takes place,impacting force,stroke of buffer between impacting interface of two group is maximum.When number of vehicles in sub-group is different,the maximum impacting force is not only different,but the stroke and energy dissipation of buffer is also different.In the couplers far from impacting interface between two groups,smaller capacity buffers could be used.