Abstract
The aim of this paper is to provide a reliable simplified numerical model for analysis of dynamic behaviour of railway tracks. This is motivated by the demands of railway companies that prefer simplified models to complex numerical models, thanks to their numerous advantages. As an adequate simplified model, the discrete support model (DSM) is selected. The range of its applicability and general formulas for identifying properties of its constituents are proposed and validated. To calibrate the DSM, a 3D detailed finite element (FE) model is created and validated by comparison with published experimental measurements. The objective function in optimization runs is formed by the L2-norm of the difference between the vertical displacement of the rail obtained by the DSM and 3D FE model. Based on conclusions from optimization runs, formulas for identifying the properties of the DSM are proposed and validated. These formulas cover a large range of typical properties of the railway tracks, which in turn identifies the range of applicability of the DSM.
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