Research on Monitoring Technology for Track Geometry Large Value Deviation Based on Bogie Acceleration of Operating EMU
Based on the in-depth analysis of the time-frequency characteristics of track inspection data in typical large value deviation sections and bogie vertical acceleration data collected from operating EMU,this paper proposed a method to identify the large value deviation of track geometry by combining the bogie acceleration scale-averaged wavelet coeffi-cients and the bogie vertical displacement.The results show that the characteristic wavelength of the first type of large value deviation is about 20～50 m,which often causes the large value deviation of vehicle vertical acceleration.The sec-ond type of large value deviation characteristic wavelength is about 3～9 m,which is more common and develops rapidly,with insensitive vehicle body acceleration,which is the main type of track geometric large value deviation.The response of the vehicle vertical acceleration is relatively low in the band of 3～9 m,while the response of the bogie vertical accel-eration is mainly concentrated below the wavelength of 10 m.For the second type of large value deviation,the use of the bogie acceleration is more appropriate for monitoring.The thresholds of bogie acceleration SAWC at the maximum design speed of 250 km/h and 350 km/h are 0.10 and 0.11 respectively,while the corresponding thresholds of bogie vertical displacement are 7.0 mm and 5.0 mm respectively.The analysis of the measured data shows that this method can effec-tively reflect the position of the large value deviation of track geometry.This paper provides technical reference for timely mastering the service status and deterioration trend of the line and ensuring the continuous and safe operation of the trains.
high-speed railwaybogie accelerationtrack condition monitoringlarge value deviationtime frequency analysis
万方数据
维普
