Electric trains use mechanical devices such as pantographs to collect current from overhead lines. This research aims to define a critical speed for the train overhead system properly and identify its significant contributors. The wave propagation speed, in addition to the cable vibratory properties, is identified through laboratory measurements. An analytical model is developed, and the results are compared with the experimental measurements. A variety of boundary conditions are considered to improve the model. Attempts are made to introduce a sound principle for describing the train overhead system's critical speed.

The measurements and the analysis concluded that the critical speed could be higher than the wave speed in a cable. Adding to the number of droppers increases the critical speed and decreases the maximum acceleration at the contact point. An important outcome is that the critical speed is not necessarily equal to the wave propagation speed in the contact wire.

电动火车使用诸如受电弓之类的机械设备从架空线上收集电流。这项研究旨在为列车高架系统正确定义一个临界速度，并确定其重要的贡献者。除电缆振动特性外，还可以通过实验室测量来确定波的传播速度。建立分析模型，并将结果与​​实验测量结果进行比较。考虑了各种边界条件以改进模型。试图引入一种合理的原理来描述列车高架系统的临界速度。

测量和分析得出的结论是，临界速度可能高于电缆中的波速。增加滴管的数量会增加临界速度，并降低接触点的最大加速度。一个重要的结果是，临界速度不一定等于接触线中的波传播速度。