Study On The Influence Of Friction Vibration On Current Carrying And Friction And Wear Of Pantograph And Catenary

During the actual operation of railway train,the contact surface between pantograph sliding plate and catenary conductor will produce friction vibration.The friction and wear of sliding plate caused by friction vibration will seriously affect the service life of sliding plate.Changing the fluctuating contact force,contact current,sliding speed and other conditions,the friction vibration acceleration between friction pairs will change,and then affect the pantograph catenary friction and wear and current carrying characteristics.The relationship between friction vibration acceleration and various influencing factors and the influence of friction vibration acceleration on Pantograph catenary friction wear and current carrying characteristics are studied,and the wear rate model is established to provide some reference for the prediction of pantograph catenary wear rate.In this thesis,the sliding electric contact experimental machine is used to carry out the current carrying friction vibration experiment under the condition of changing the basic working condition.Through the experimental data,the variation laws of friction coefficient,wear rate,current carrying efficiency and current carrying stability with friction vibration acceleration under different basic working conditions are obtained.The research shows that the friction vibration acceleration is hardly affected by changing the fluctuation frequency of contact force.The fluctuation amplitude of contact force and sliding speed are increased,and the friction vibration acceleration is increased.The friction coefficient,wear rate and surface roughness are positively correlated with the friction vibration acceleration,and the current carrying efficiency and current carrying stability are negatively correlated with the friction vibration acceleration.When the fluctuation range of contact force and sliding speed are increased,the increased friction vibration increases the contact stress and shear force between the micro convex bodies respectively,and the micro convex bodies are easy to be damaged,which then affects the friction and wear of the sliding plate;The current increases in the range of 100 A to 200 A,and the friction vibration acceleration increases.The surface roughness,friction coefficient and wear rate are positively correlated with the friction vibration acceleration,and the current carrying efficiency and current carrying stability are negatively correlated with the friction vibration acceleration.The main wear form is arc ablation.When the current is between 200 A and 250 A,the friction vibration acceleration will decrease with the increase of current.The friction coefficient and surface roughness are positively correlated with the friction vibration acceleration.At this time,the wear rate still increases,and the current carrying efficiency and current carrying stability increase with the decrease of friction vibration acceleration,but the change degree is small.Based on the experimental research,the whale algorithm(WOA)is used to optimize the random forest algorithm(RF),and the regression model of friction vibration acceleration and wear rate is established,which is compared with the non optimized RF model.The verification results show that the optimized model fits well and can better predict the wear rate.This thesis has 40 figures,11 tables and 73 references.