Research On Track Irregularity Of High Speed Railway Based On Track Inspection Data

Track irregularity is of great significance to safety and stability of vehicle driving,as well as service quality,life and maintenance of the rail track.Based on the track inspection data(medium-long wave)and vehicle acceleration data of a high-speed railway(line 1)in 2019 and the short-wave irregularity data of a high-speed railway(line 2),this thesis mainly completes the following work :(1)Preprocess the track inspection data.According to the different wavelengths,the power spectral density of short-wave,medium-wave and medium-long-wave track irregularity(referred to as track spectrum)is calculated and analyzed.Divide track spectrum into different percentiles.The fitting formula of median spectrum of short-wave,medium-wave,medium-long wave and full wavelength is put forward.Besides,compare the median spectrum with typical spectrum.In addition,simulate the track irregularity data of the track spectrum formula proposed in this thesis based on trigonometric series method.(2)The Refitting formula for power spectral density of track irregularity is put forward,which can perfectly fit the typical track spectrum at home and abroad.Besides,A unified expression of power spectral density of track irregularity is presented.(3)Correlation between vehicle acceleration and track irregularity is established by coherence analysis.Then a time-frequency analysis system of continuous wavelet transform-Hilbert-Huang transform is established,which can analyze the characteristic frequency band of acceleration and locate and identify the detrimental wavelength.Finally,according to the limit of track geometry management,the threshold of vertical acceleration of vehicle body at different speed levels is determined,and the correlation is analyzed.(4)The shortcomings of the TQI are analyzed by numerical simulation method.To make up for the shortcomings,The method of Hottling-entropy weight-wavelet disease analysis was proposed.The maximum,minimum and median spectrum of line 1 are fitted,which can be used as a three-level spectrum to judge the line state.