Method Study on Curve Realignment of Existing Railway Based on Point Cloud Data

In order to make railway track after being speeded up meet the need of high smoothness and high riding comfort,the article,on the basis of point cloud data obtained by laser scanning technology,conducted a description about the track geometry by means of curvature comb analysis.In light of the rate of curvature change,this article found out the blind area of traditional measurement mode to the new standard maintenance operation mode after the speeding-up,and put forward the realignment method for the rate of curvature change of the exiting railway.As a result,this method converts the original geometry fitting idea of the process-oriented pure geometric-shape management mode to a new geometric-shape maintenance idea of the object-oriented train-track integration mode,so that the track geometry after maintenance can coincide with the characteristics of train's movement.