Research on Service Performance of Existing Railway Passenger Cars
China has a large number of existing railway passenger cars,and their operation spans a complex time-space environment.The evolving service performance of these cars presents considerable challenges in ensuring operation safety and O&M support.To acquire a systematic understanding of the service condition of railway passenger cars,the study examines the current operation status of conventional railway passenger cars in China.As an example,carbody steel structures are analyzed to assess factors influencing the service performance of these cars.According to the findings,the majority of passenger cars have entered the middle and late stages of service life,and information technology such as 5T achieves comprehensive monitoring.Moreover,the corrosion conditions of steel structures of passenger cars vary in different operation environments.Some older passenger vehicles have severely corroded steel structures.The corrosion becomes more severe with increasing operation time/mileage.For the RW25G carbody and 209P bogie in service,a fatigue reliability study shows all key parts meet the design requirements for a 30-year service life.For the YZ25T carbody and CW-200K bogie in service,real vehicle tracking tests are conducted,and show significant damage occurred at certain critical load-bearing positions of the bogie.For 25T passenger cars in service,tracking tests focused on vehile dynamics are carried out through TPDS,TCDS,and onboard inspection.Additionally,simulation analysis on vehicle dynamics is conducted according to the measured wear data of wheels and deterioration data of dampers.The results show that there is a certain degree of redundancy of vehicle's running safety within one wheel reprofiling cycle.With the increase of service time,the degradation or failure of key components of the bogie will have adverse effects on the vehicle's hunting stability and riding index.Simulations with random parameters are conducted and show that there is an increase in wheel unloading rate under extreme working conditions which should be given full attention.
万方数据
维普
