Running Stability Analysis of Railway Vehicles Based on Three-Dimensional CAD Model

Inaccurate results are usually produced due to lack of precise dynamic parameters when analyzing the running stability of railway vehicles. In this paper, a new solution is proposed to conduct the running stability analysis of railway vehicles supported by their three-dimensional (3D) CAD models, which are realized based on the intrinsic mapping relationship between the dynamic model and the 3D CAD model of railway vehicles. First, a dynamic model library of railway vehicles is established, and for each model type the software package for running stability analysis is programmed with Matlab. Then according to the requested parameters of each model, the corresponding dynamic parameter extraction flow based on 3D CAD model is designed by the secondary development of CAD software. The user chooses CAD objects and sets part of dynamic parameters using a wizard-style guiding dialogs; the background program will automatically and accurately extract the physical and geometric parameters from the CAD model, and then call the Matlab software package and transfer the parameter values, with analysis results presented in CAD environment. The case study shows that, this method can not only ensure the precision of dynamic parameters, but also improve the dynamic modeling efficiency for running stability analysis of railway vehicles.