This paper has made a study of variation characteristics of the track dynamic irregularity at one point, using historical wave data from track geometry car, and built a model for describing the irregularity\'s evolution, according to the variation characteristics.

Effect of rail irregularity wavelength on lateral runningcomfort of speed-raised train;

Method of equivalency transform for power spectrum density of track irregularity on central line from on left/right rail;

Research purposes: The unevenness of Overhead Rigid Suspension arises the bad vibration between the pantograph and rigid suspension,which can spoil the current collection and endanger the running safety.

The system dynamics responses of the model under various unevenness combinations are analyzed.

Research of the effect of track complex irregularities on the vehicle dynamic response;

The main dynamic problems affecting guideway design,such as guideway irregularities,guideway stiffness are discusssed.

Using the vertical lateral model of vehicle track coupling system, which is set up based on the vehicle track coupling dynamics, and taking the coexistence of manifold wavelengths into account, the management values of various track irregularities in 250 km/h high speed railway are calculated by simulation.

The trace curve of rail corrugation was inputted as track cross-level irregularity,and the vertical displacement,acceleration and other dynamic responses of components under different train speeds were calculated numerically,and the relationship between the dynamic responses and the fractal dimension was investigated.