计及受电弓幅频特性的受电弓参数与吊弦间距匹配研究

Coupling performance between pantograph parameters and dropper spacing considering the amplitude-frequency characteristics the of pantograph

首先推导了受电弓的稳态幅频特性,结合对接触压力波动原因的分析,得出了受电弓参数与吊弦频率的匹配关系;然后逐一改变受电弓参数,分析受电弓幅频特性,可得受电弓弓头质量和刚度对受电弓幅频特性的影响明显;最后在建立的弓网动态模型中,分别调整受电弓弓头质量和刚度,统计得到接触压力标准差,验证了匹配的效果。研究结果表明,在运行中受电弓通过吊弦间隔的频率若为f,调整受电弓的参数,使受电弓幅频特性在频率f处有极小值,能有效降低接触压力的波动,有利于改善受流。该匹配关系可为弓网系统设计、选型和评价提供参考。

The amplitude-frequency characteristics of a pantograph were derived. Based on the analysis of force fluctuation,the coupling relationship between pantograph parameters and droppers was obtained. Then the variation of the amplitude- frequency characteristics was analyzed by changing pantograph parameters individually. It is found the influence of the collector head＇s mass and stiffness on the amplitude-frequency characteristics is obvious. The coupling relationship in the pantograph-catenary simulation system was validated by observing the variation of contact force standard deviation with different mass and stiffness of the collector head respectively. Adjusting the pantograph parameters to make the frequency,at which the response on the amplitude-frequency curve reaches its minimum,be equal to the frequency of the droppers,the fluctuation of contact force would be lowered,which means the current collection quality is improved to some extent. The coupling relationship proposed can be referential to the design,selection and performance assessment of pantograph-catenary systems.