The passenger railway vehicle YZ25G is taken as a case
study, and the typical vertical dynamic model showed in Fig.
2 is adopted to carry out running stability analysis for it. The
3D assembly CAD model is created in SolidWorks by
applying top-down assembly modeling method, whose
hierarchy structure is matching with that of the dynamic
model for the convenience of the following parameter
extraction process. The 3D CAD model of the bogie is
showed in Fig. 4, and the 3D CAD model of the whole
vehicle is showed in Fig. 5.