چكيده به لاتين
Moving trains produce dynamic loads, stresses, deformations, vibrations, and so forth, in components of railway track. Dynamic methods must be used for modeling and analyzing of the model, because the dynamic nature of interaction between train and track. Appropriate solving and modeling of the interaction equations are needed in order to obtain correct investigation and acceptable results. One of the most common methods for solving the problem is the finite element method. In recent years, formulation of the Moving Coordinate Method, because it reduces the complexity of finite element and decreases the computation times, is suggested by some researchers for studying the interaction problem.
In the present study, the moving coordinate method is used for formulation of the interaction problem between the train and track. In this modeling, several models of carbody are employed. In the railway track model, first, a beam on continuous viscoelastic foundation is used, which brings about acceptable results. In the second case, results are obtained when the track is modeled by a beam on discrete supports consisting of sleeper mass and ballast mass, which has a suitable agreement with the results from the continuous model. Dynamic behavior and dynamic response are influenced by such parameters as velocity of train, axial load, and distance between sleepers, etc. In order to investigate the effects of these parameters on the dynamic behavior of the track, sensitivity analysis is employed. It is observed that an increase or decrease in the value of such parameters dramatically affects the behavior of the track.
After investigation and comparison it can be concluded that the moving coordinate method provides correct, acceptable, and reasonable results. In addition, the moving coordinate method—by decreasing the complexity of the finite element method—is effective in increasing the analysis speed, and it will decrease the calculation volume and decrease the calculation time.
Keywords: Dynamic train-track interaction; Moving coordinate; Track dynamic; Sensitivity analysis
