In recent years,there have been large-scale incidents of abnormal wear on subway pantographs and catenaries across China,especially in winter.In 2022,more than 30 subway lines nationwide encountered this issue,resulting in economic losses amount-ing to hundreds of millions of yuan.In order to study the influence of environmental temperature on the pantograph-catenary relation-ship,a finite element model of the rigid catenary of a subway line was established.The stiffness curve of the catenary was calculated at ambient temperatures of-20～20 ℃.The pattern of influence of environmental temperature on the stiffness of the catenary was analyzed.Then,a dynamic model of subway pantograph-catenary coupling with variable stiffness was established,and its accuracy was verified ac-cording to EN 50119 and other standards.The pantograph-catenary contact force was calculated under the conditions of ambient tempera-tures of-20～20 ℃,train running speed of 40～90 km/h,pantograph static lifting force of 70～160 N,and stuck positioning clamps.Fur-thermore,the influence of environmental temperature on the pantograph-catenary contact force and the pantograph-catenary current col-lection quality was analyzed.The results show that there is a strong positive correlation between environmental temperature and the pan-tograph-catenary contact force and current collection quality.When the environmental temperature is below 0 ℃,the pantograph-catena-ry current collection index will seriously deteriorate;stuck wire clamps will have a negative impact on the pantograph-catenary contact force and current collection quality,and the higher the train running speed,the greater the impact will be.
维普
万方数据