| Track Irregularity is the most fundamental contents and the most important issues of research field in orbit interaction, which is very complex and involves too much different fields. Track Irregularity is the disturbance resource of wheel-rail system as produces the vibration of locomotive & rolling stock and the main reason of wheel-rail dynamic interaction. It also has significant influencing factor not only related with the vehicle travel safety, riding quality and comfortableness, but also the service life of vehicles & tracks, and environmental noise. Track irregularity has more effect on the high-speed and heavy haul operation; meanwhile, track irregular is the main factor which restricts the increasing of train speed directly, and it is also an important embodiment of the comprehensive performance of track structure and carrying capacity.Track Irregularity is still an indispensable and primary input function to determine the vibration parameters of suspension among dynamic design for rolling stock. In order to investigate the interaction of wheel-rail, as well as to study on the vehicle & track, dynamic experiment and computer simulation, all these fields require further research of track irregularity.Track irregularity is related to the track structure type state.At present, the research to irregularities of ballasted track had been comparatively much studied at home and abroad. At the same time, the systematic study on the track irregularity of the ballastless track in the country is still a blank. Track irregularity related to ballastless track has its own peculiar laws, such as the wave length of the distribution,which type of irregularity will appear very easily and so on. These are all different from ballasted track.This thesis mainly comply on the analyses the randomness of track irregularity, which applied to the principle and method in mathematical statistics, that based on the statistical analysis of dynamic irregularity ballastless track detection data on Suining-Chongqing railway, and then has a comprehensive study on statistical law of ballastless track irregularity.The thesis complies with the research approach, and detailed method is as follows: tracing research of the dynamic inspection data about railway track irregularities which are obtained by track inspection car of Suining-Chongqing ballastless track railway line during the first year operation: in the time domain, according to the perspective of the amplitude in track irregularity, the author has an overall analysis and deep investigating the statistical characteristics of track irregularity; in the frequency domain, analyzing domestic & international research and calculation method in the track spectrum of track irregularity, besides, the writer, study on the preliminary research of track spectrum about track irregularity related to Suining-Chongqing ballastless track railway line.Through theoretical and analysis, the results and suggestions in track irregularity are presented as bellows, including these four aspects:â… , numerical distribution;â…¡, score system;â…¢, track quality index;â…£, power spectral density.
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