Investigation on 0.01～1 m wavelength longitudinal level irregularity of high speed railway
With the continuous expansion of China's high-speed railway development and the ongoing improvement in operational speed,the issue of vibrations and noise caused by uneven track short-wave irregularity has become increasingly severe.A thorough investigation into the time domain,frequency domain and time-frequency domain characteristics of high-speed railway short-wave irregularity holds significant reference value in accurately grasping the track regularity and the resulting vibrations and damages to the vehicle-track system.Taking the measured data of surface longitudinal level irregularities in the 0.01～1 m wavelength range of a certain high-speed railway as the subject of study.After preprocessing the data to eliminate outliers and trend components,a time domain analysis was performed on the measured irregularity data,revealing the statistical and distribution characteristics of short waves on this high-speed railway line.Using the average periodogram method,the power spectral density of track short-wave irregularity on this high-speed railway line was computed.A nonlinear least squares fitting optimization algorithm was employed to propose the spectrum of track short-wave irregularity.Furthermore,an empirical mode decomposition and Hilbert transform were conducted on the data from a time-frequency perspective to analyze the Hilbert spectrum and marginal spectrum of short-wave irregularity on this high-speed railway line.The results indicate that the amplitude of various statistical quantities of track short-wave irregularity on this high-speed railway line is relatively small.They approximately follow a normal distribution.The power spectral density of track short-wave irregularity on this high-speed railway line contains multiple periodic components related to rail corrugation.The proposed spectrum of high-speed railway track short-wave irregularity fits the measured power spectral density well,with a fitting performance superior to the classical SATO proposed short-wave spectrum and the short-wave spectrum of 50 kg/m rails.Identification and localization of potential short-wave irregularity defects on this high-speed railway line are performed,and the time-frequency analysis method can be effectively applied to the analysis and routine management and maintenance of track regularity in high-speed railways.
万方数据
维普
