Vibration prediction based on the coupling method of half-train model and 3D refined finite element ground model

In this study, a train model and a refined three-dimensional(3D) finite element (FE) model were combined to predict the environmental vibration induced by running trains in the surroundings. A half-train model and a 3D rail-track-soil FE model are established, in which the connection mode of rail and fastener has also been studied. The vibration of the train and refined 3D FE ground model are predicted simultaneously, and the solution process is realised by an interactive and iterative calculation method, considering also the vertical track irregularity. The computational time is basically the same as the method of simulating train loads with a set of moving concentrated forces. The results of the comparative studies carried out show that the predicted vibrations are in good agreement with the measured values, verifying the feasibility and correctness of the proposed method. Finally, the verification of the proposed method is carried out against experiment measurement.