Influence of the orientation stiffness of tumbler journal box to the stability of high speed vehicles

The structure of tumbler journal box orientation mode was widely used in the high speed EMU, as it has the excellence of the stiffness in longitudinal, lateral and vertical direction can be set respectively. The longitudinal stiffness and lateral stiffness of the journal box was supplied by the stiffness of the elasticity node of tumbler. The stability of the high speed vehicle has a big relation with the stiffness of the elasticity node of tumbler. The dynamic model of the high speed vehicle was set up based on the analysis of the structure of the tumbler journal box in detail. The linear and nonlinear stability analysis of the model in which the parameter of the real vehicle was used was carried out first, the influence of the variable of the longitudinal stiffness and the lateral stiffness of the elasticity node of tumbler to the hunting stability of the high speed vehicle was researched. The stiffness of the elasticity node of tumbler especially the longitudinal stiffness has a big influence to the hunting speed of the high speed vehicle.