3D Visualization Of Train Realistic Running And Emergency Rescue Simulation Of Train Operation Accident

The digitalization and informatization of railway system is the main development direction of modern railway.The 13 th Five-Year Development Plan of Railway clearly puts forward the goal of accelerating the construction of a digitalized railway framework serving railway construction and operation management.The spatial data of traditional railway lines and their geographic environment are too abstract to visually and intuitively represent the relevant parameters of railway lines,nor to reflect the relationship between lines and the surrounding geographic environment.3D visualization of train operation based on real geographical environment and line data has become an important development trend of "digital railway".It has been widely used in railway route selection,construction,maintenance and railway emergency management and rescue.Based on the framework of 3D visualization of train realistic running,this paper further combines virtual reality technology to carry out the emergency rescue simulation of train operation accident.The key to the 3D visualization of train running is the automatic modeling of railway lines and their environment.This paper establishes an automated modeling method for quickly constructing the geographic environment along the railway line by using Bing Map dataset.According to the characteristics of the strip distribution of railway lines,the reconstructed terrain is segmented and deleted to optimize the display and storage of the terrain.The longitude and latitude extraction algorithm of arbitrary line feature points based on OpenStreetMap is designed and implemented.These points are mapped to terrain world coordinate system,and the approximate representation of the whole line in mathematical form is obtained by interpolation of Bessel curve.The line is discretized by 8 discrete points per unit length,and the transformation between the linear coordinates of track and the world coordinates is realized.The automatic modeling process of any type of long lines and their environment in complex terrain is realized by combining the line basic model library with the line segment data.The relative position control algorithm of train realistic running is designed and implemented.According to the relative position of the train in the line,the dynamic generation control algorithm of the line model is used to optimize the running scene.Finally,an example is given to verify the actual operation of the double-track train in GuangyuanNingqiang section of Xicheng Line,and a good visualization effect was obtained.Aiming at the shortcomings of the current emergency rescue training for train operation accident,the process of pulling and jacking recovery methods used in emergency rescue is simplified as characteristic steps,and the rescue process and rescue operation are simulated with VR technology.The hinged constraint is used to simplify the simulation of the complex rail constraint relationship occurring during the re-railing process and the mechanical transmission constraint relationship between the jacking recovery equipments.Combined with the existing lifting recovery simulation,a relatively complete simulation solution for emergency rescue of train operation accidents is formed.