脉动风下高速铁路接触网抖振对弓网受流性能的影响

Influence of High-speed Railway Catenary Buffeting on Pantographcatenary Current Collection under Fluctuating Wind

接触网系统在短周期脉动风的作用下,会发生抖振现象,从而引起弓网受流的恶化。本文考虑作用在接触网上的水平与竖直脉动风和静风载荷,推导作用在接触网系统上的抖振力模型;采用Davenport谱和Panosfsky谱,运用谐波合成法分别模拟水平和竖直方向上的脉动风时程;利用有限元分析软件MSC-MARC建立弓网耦合模型,将抖振力施加到接触网模型中,分析接触网在脉动风下的风振响应,对脉动风作用下的弓网系统进行动态仿真,研究脉动风下接触网抖振对弓网动态受流性能的影响。研究结果表明:脉动风引起的接触网抖振对弓网受流影响很大,在研究接触网风振响应和弓网动态特性时,应综合考虑静风载荷和脉动风载荷的影响;脉动风攻角的变化对弓网受流影响明显,风攻角是研究风载荷下弓网受流性能时不可忽视的因素。

Under the action of short-period fluctuating winds ,the buffeting phenomenon occurs with the catenary system and results in poor current collection between pantograph and catenary .In this paper ,the buffeting force model was deduced in consideration of the horizontal and vertical fluctuating winds and the static wind loads acting upon the catenary system .Adopting the Davenport spectrum and the Panosfsky spectrum ,the time histo-ries of the fluctuating winds in both the horizontal and vertical directions are simulated respectively with the harmonic wave superimposing method .The pantograph and catenary coupling model was established by Soft-ware MSC-MARC .The wind vibration responses of the catenary under the fluctuating wind were analyzed by adding the buffeting force into the catenary model .And the influence of buffeting on dynamic current-collection was studied by dynamic simulation of pantograph and catenary movements .The research results show as fol-lows ：Buffeting of the catenary caused by fluctuating winds has very much great influence on current collection of the pantograph and catenary system ,so when the wind vibration responses of the catenary and the dynamic pantograph-catenary behaviors are studied ,the influence of the static wind loads and fluctuating wind loads should be taken into comprehensive consideration ;changes of the attack angle affect pantograph-catenary cur-rent collection significantly ,so the attack angle forms an important factor that should not be neglected in stud-ying current collection performance of the pantograph and catenary system under loading of winds .