Abstract
In general, mass of freight wagons is dramatically changed as compared to the passenger cars. Therefore, the rolling characteristics of body such as the natural frequency, the peak value of rolling and the damping ratio widely varies. In order to investigate the fundamental rolling characteristics of freight wagons, simplified models are built and numerically analyzed in this paper. The analysis aims to clarify the effect of torsional stiffness of railway freight wagon for the rolling characteristic of both front-side and rear-side bodies including corresponding bogies. Since the torsional stiffness can be considered as a non-linear element, FEM model with containers is built to identify the characteristics. 12 D.O.F. model which combines two half-vehicle models with 6 D.O.F. is used for the analysis. Comparing the growth of roll angles regarding front and rear bodies, the rear body tends to be largely oscillated at the transient phase when the vehicle runs into the cross-level irregularity.
