Abstract: The frequent phenomenon of contact pair abnormal wear in the pantograph-catenary system(PCS) has significantly increased operational costs. Therefore, investigating the evolutionary law of contact pair wear performance and its impact on the dynamic performance of PCS is of great significance. Firstly, this study conducted ground experiments to explore the evolutionary law of contact pair wear performance with running mileage and to adjust the wear coefficient of the contact wire wear model. Subsequently, a pantograph-catenary coupled model considering contact wire wear is established based on multibody dynamics theory and the contact wire wear model above. The results indicate that as the operating distance increases, non-uniform wear of the contact wire escalates, leading to degradation in the dynamic performance of PCS and deterioration in the wear performance of the contact wire. The maximum contact force increases by 80.13%, while the minimum contact force decreases by 98.82%. Furthermore, the standard deviation of contact force rises by 286.61%. The wear rate of the most severe uneven wear point on contact wire increases by 546.33%. Based on ground experiments and simulation analysis, it is found that there are three stages in the wear cycle of both the carbon strip and the contact wire. For the carbon strip, these stages are the running-in stage, the stable stage, and the deterioration stage. For the contact wire, due to variations in dynamic interaction quality, its wear rate changes can be categorized into the wear stable stage, the slow deterioration period, and the deterioration period. The results of this study can provide reference for research on current-carrying friction and wear and maintenance of PCS.

Key words: pantograph and catenary system, dynamic performance, wear performance, contact wire wear