Analysis And Modeling Of High Current Sliding Electrical Contact Friction Dynamics In Pantograph-Catenary System

Due to the development of electric locomotives in the direction of high speed and heavy load,the operating conditions of the pantograph-catenary system are more complicated.The increased wear of the sliders and the deterioration of the contact surface morphology lead to increased frictional vibration between the sliding electrical contact frictional pairs,which further deteriorates the contact state of the frictional pairs and the quality of the current.In the end,the result ultimately affects the safe and stable operation of the train and the service life of pantograph-catenary system.Therefore,it is of great practical significance to conduct research on pantograph-catenary system sliding frictional vibration under operating conditions..In this thesis,by analyzing the force of the sliding electrical contact in the pantograph-catenary system,combined with the mechanical frictional vibration model and the operating characteristics of the pantograph-catenary system,a preliminary sliding electrical contact frictional vibration model of the pantograph-catenary system is established.Further,the variation law of the pantograph-catenary system frictional vibration characteristics is analyzed by the current-carrying friction vibration experiment and the preliminary friction vibration model.Finally,combined with the initially established frictional vibration model,experiment and theoretical analysis,the functional relationship between parameters and operating conditions in the frictional vibration model is solved,and the current-carrying frictional vibration model suitable for the operation of the pantograph-catenary system is obtained.The effectiveness of the model is proved by verification experiments,.Based on the preliminary current-carrying frictional vibration model,through the analysis of the frictional pair force under different contact states and combined with the current-carrying frictional vibration experimental phenomenon,the variation law of frictional vibration characteristics is as follows: In general,the SD value of frictional vibration acceleration(mean square error of frictional vibration data)and amplitude increase with the increase of normal pressure,running speed and current intensity;But after the current intensity is greater than 200 A,the longitudinal SD value gradually decreases;When the normal pressure,running speed,and current intensity respectively increase to 100 N,100km/h,and 200 A,,the longitudinal acceleration amplitude growth tends to be flat.Based on the preliminary frictional vibration model,combined with the experimental laws and theoretical analysis,a current-carrying frictional vibration model of pantograph-catenary system sliding electrical contact with normal pressure,running speed and current intensity asindependent variables was established and the validity of the model was verified.The current-carrying frictional vibration model can effectively predict the frictional vibration under the running condition of pantograph-catenary system,which lays a foundation for further research on the characteristics of frictional vibration for the electric locomotive’s stable operation and the the pantograph-catenary system’s service life.The thesis has 26 pictures,6 tables,and 52 references.