牵引与桥梁上拱激励下城轨列车动力学性能研究

Research on Dynamic of Urban Rail Vehicle of Variable Speed and Long-wave Excitation Conditions

城轨列车的实时变速工况是极为普遍的运行状态,若仅以匀速工况替代,无法得到贴近实际的研究结论。为此,提出一种新的考虑内外耦合激励的动力学模型。建立单节车体模型及编组城轨列车模型,综合考虑牵引工况以及城轨列车通过高架线路时的桥梁徐变上拱长波不平顺,研究在该内外耦合激励下的车辆动力学性能。基于微元法思想,计算得到城轨列车牵引工况下的电机转矩及基本阻力转矩与运行时间的关系,得到合理的综合工况下的运行状态。研究结果表明,在变速工况下车辆的轮对磨耗数、垂向平稳性指标及轮重减载率均有所上升;在桥梁长波不平顺激励下,车辆垂向平稳性指标有所下降、轮重减载率升高,而对车辆横向平稳性指标影响较小。

Real-time variable speed conditions of urban rail trains are extremely common operating conditions,if only to uniform conditions instead,it cannot get a satisfactory conclusion. To this end,a new dynamic model considering coupled internal and external excitation is proposed. Based on the traction condition and the bridge creep on the elevated rail line,the vehicle dynamics performance under the coupling of the internal and external are studied. Based on the idea of micro-element method,the relationship between the torque and the running torque of the traction condition of the city rail is calculated,and the running condition is obtained under the reasonable comprehensive condition. The results show that the number of wheel wear and the vertical stability of the vehicle are increasing under the variable speed condition. Under the long wave irregularity of the bridge,the vertical stability index of the vehicle decreases,while the lateral stability Indicators have less impact.