弓网接触力在线测试方法研究

Study on an online measurement method of pantograph-catenary contact force

弓网接触力是评估弓网受流质量和弓头滑板磨损寿命、诊断接触网局部缺陷的直接依据,其在线监测是未来电气化铁路发展亟待解决的关键问题之一。针对现有测试方法存在的问题,本文提出了在弓头簧片背面安装应变传感器的可行方案,避免了滑板更换对传感器带来的影响;同时,实现了加载过程中任一时刻接触点位置的直接测量,结合测点应变值,可直接反推出接触力,无需对滑板实体结构进行简化。

Pantograph-catenary contact force is a direct basis to evaluate the current collection quality and the wear life of the slide plate,and to diagnose the local defects of the catenary.Therefore,on-line monitoring of pantograph-catenary contact force is one of the key problems to be addressed in the future development of electrified railway.In view of the problems of testing methods mentioned in the existing literatures,this paper provides a feasible scheme of installing strain sensors on the back of leaf spring of pantograph head,which avoids the influence of the slide plate replacement on the sensor.Moreover,the direct measurement of the position of contact point at any time during loading is realized.Combined with the measuring point strain,the contact force can be deduced directly without simplifying the actual structure of the sliding plate.