基于受电弓弹性体模型的弓网动力学分析

针对简单链型悬挂接触网及电力机车DSA250型受电弓,基于有限单元法,建立接触网模型和考虑弹性变形的受电弓模型;对弓网的动力学性能进行分析,并与采用质量块受电弓模型的计算数据进行对比.结果表明:当DSA250型受电弓通过该型接触网时,其在未出现离线情况下的最高速度为230 km/h;受电弓前、后滑板表现出不同的受流特性,前滑板相对后滑板有较好的受流;考虑弓头与接触线的相互作用频率高于20 Hz时,40～100 Hz的高频分量在接触力和加速度频谱中占有较大的比重,弓头的变形模态将对弓网的动力学特性起至关重要的作用,如果采用质量块受电弓模型进行计算,将造成该模态的缺失,从而导致计算结果有较大的偏差.

Analysis of Dynamic Pantograph-catenary Interaction Based on Elastic Pantograph Model

The dynamic performance of the stitched catenary and the DSA250 pantograph is analyzed. The finite element models of the pantograph and the catenary are established,regarding the pan-head of the pantograph as an elastic body. Furthermore,on the basis of the contact element,the coupled motion equation of the pantograph-catenary system is derived and solved. Subsequently a comparison with the spring-mass system pantograph model is made. The results show as follows: With the elastic pan-head model,the contact loss can not be detected until the speed reaches higher than 230 km/h; the quality of current collection presents a different trend on the two collectors,the front collector appears to be better than the rear collector; considering the interaction frequency being higher than the typical frequency band of 20 Hz,the components of high frequencies from 40 Hz to 100 Hz appear extremely evident and the deformable modes of the pan-head have important influence on the dynamic performance between the pantograph and catenary; if the spring-mass model of pantograph is used,there will be obvious differences with the elastic pantograph model in the calculation results due to lacking of the modes at high frequencies.