复杂工况下受电弓升弓碰撞特性

Pantograph Lifting Collision Characteristics under Complex Working Conditions

[目的]为研究多制式混合动力牵引模式下,列车频繁升降受电弓所引起的动力学问题,分析受电弓的碰撞特性。[方法]以弓网系统为研究对象,搭建弓网碰撞试验台,通过试验研究受电弓升弓碰撞过程中的动力学特性,建立对应的动力学模型;通过试验数据验证了所提模型的有效性,并分析了垂向碰撞接触力的变化规律。[结果及结论]在弓网碰撞时,碰撞速度与接触线拉出值对弓网垂向接触力最大值、标准差及动态系数均有较大的影响。随着碰撞速度的增大,垂向接触力的标准差与最大值均随之增大,动态系数先减小后增大,当碰撞速度为0.5 m/s时,动态系数存在最小值。随着拉出值的增大,垂向碰撞接触力标准差有所减小。当碰撞速度较低时,垂向碰撞接触力最大值随着碰撞速度的增大而减小;反之,则垂向碰撞接触力最大值先减小后增大,并在拉出值为200 mm附近存在最小值。在任意速度工况下,动态系数均表现为无拉出值时最大,400 mm拉出值附近最小。

[Objective]To investigate the dynamics issues arising from the frequent lifting and lowering of pantographs in multi-mode hybrid traction trains,the pantograph collision characteristics are analyzed.[Method]Taking the PC(pantograph-catenary)system as research object,a PC collision test bench is built to study the dynamics characteristics of pantograph collisions during the lifting process.A corresponding dynamics model is established and validated using experimental data.The variation patterns of vertical collision contact forces are also analyzed.[Result&Conclusion]During PC collisions,collision speed and contact wire stagger value both significantly affect the maximum value,standard deviation,and dynamic coefficient of PC vertical contact force.As the collision speed increases,both the standard deviation and the maximum value of the vertical contact force increase accordingly,while the dynamic coefficient initially decreases and then increases,reaching its minimum when the collision speed is 0.5 m/s.As the stagger value increases,the standard deviation of the vertical collision contact force decreases.At a lower collision speed,the maximum value of the vertical contact force decreases with the increasing collision speed.Conversely,at a higher speed,the minimum vertical contact force initially decreases and then increases,reaching a minimum around a stagger value of 200 mm.Across all speed conditions,the dynamic coefficient is highest when there is no stagger and reaches its lowest point around a stagger value of 400 mm.