Analysis Of Pantograph-catenary System Current Collection Of Urban Railway

With the expansion of urban areas,subway lines gradually are extended from urban centers to suburbs and airports.Therefore,it is an urgent problem to improve train speed and save passengers' travel time.The quality of current collection of pantograph and catenary system is one of the core technologies at high operating speed.In order to analyze the train current collection,the rigid suspension catenary and the flexible suspension catenary design parameters were studied by using the finite element simulation method.A new type rigid-flexible suspension was proposed for tunnel by combining with the structure characteristics of rigid and flexible catenary suspension.Using the simulation method tested new rigid-flexible catenary high-speed operation ability.Firstly,simple catenary-pantograph,rigid catenary-pantograph models were established by using MSC.Marc software.According to EN50318 and the measured data,the accuracy of the model was verified.Secondly,by analyzing the stiffness distribution and the stiffness change rate,the influence of the catenary tension and span arrangement of the simple catenary suspension catenary on the stiffness of the catenary is discussed.Based on the analysis of amplitude,moving average,moving standard deviation,statistical value and spectrum of contact force,the influence of the tension and linear density of contact wire and messenger wire,span arrangement about the simple suspension catenary stiffness current collection quality were analyzed.Combined with qualitative analysis of catenary design parameters,response surface analysis method was introduced in this thesis to establish a regression model that made the main design parameters of catenary as independent variables and the statistical index of contact force of catenary as dependent variables.The influence of multi-parameter changes on the quality of catenary when the speed was 160km/h and the optimization scheme was supposed.Then,the influence of the rigid catenary current collection quality of pantograph-catenary of span arrangement,equivalent stiffness of suspension mechanism,train running speed,contact stiffness of pantograph-catenary,static lift force of pantograph were analyzed when the train run normal section.Furthermore,rigid catenary current collection quality of pantograph-catenary was studied when the train run overlapping section,rigid-flexible transition points.The results showed the design parameters and structure of rigid suspension can only meet the requirements of low speed operation.Finally,based on the above mentioned research,a new rigid-flexible suspension catenary method was proposed for urban rail transit in this thesis.To analyze the contact force characteristics during the vehicle operation,the catenary and pantograph models were established by using the MSC.Marc software.At the speed of 120km/h,the simulation results showed that the contact force of the rigid suspension catenary changed greatly,but the rigid-flexible catenary had better current collection quality.When the vehicle run in normal section,overlapping section and the wheel-rail excitation,the speed reaches 180km/h,the new rigid-flexible catenary still had better current collection quality.Compared with the rigid catenary,the new rigid-flexible catenary had the characteristics of high elasticity,attrition uniform of the pantograph slide and running reliability.And its structure height was lower and the elasticity uniformity was better compared with flexible catenary.It provided reliable guarantee for the vehicle run at high speed in the tunnel of subway line.