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Search: WFRF:(Ossberger Uwe) > (2022)

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1.
  • Pålsson, Björn, 1981, et al. (author)
  • Calibration of a model for dynamic vehicle – track interaction in crossing panels to comprehensive field measurements
  • 2022
  • Conference paper (other academic/artistic)abstract
    • A so-called Whole System Model (WSM) for railway switches and crossings (S&C) is currently under development within the European research program Shift2Rail. The objective of the WSM is that it should allow for holistic simulation-based evaluation of S&C designs and ultimately provide input for Life Cycle Cost analysis and virtual homologation. At the centre of the WSM is a multibody simulation (MBS) model that evaluates the dynamic vehicle-track interaction for a given S&C design and traffic situation and generates wheel-rail contact quantities and structural responses for the following damage calculations. This paper is focused on the MBS model and present developments for a finite element track model of an S&C crossing panel. The developments concern the model itself and a calibration to measurement data from a comprehensively instrumented S&C demonstrator installed as a part of Shift2Rail activities in the Austrian railway network. The presented track model demonstrates an overall good agreement between measurements and simulation after minor and physical track parameter adjustments. A very good agreement is obtained at the center of the crossing panel at the crossing transition while discrepancies are found across the track along the sleeper that goes underneath the crossing transition. It is hypothesized that this discrepancy is due to variations in ballast stiffness distribution under the investigated sleeper. It is concluded that the presented track model can represent the track dynamics well enough to fulfil its function within the Whole System Modelling scheme.
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2.
  • Sazgetdinov, K., et al. (author)
  • A SEMI-PHYSICAL MODEL TO PREDICT PLASTICITY IN RAILWAY TURNOUT CROSSINGS
  • 2022
  • In: CM 2022 - 12th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, Conference Proceedings. ; , s. 749-754
  • Conference paper (peer-reviewed)abstract
    • Large dynamic contact forces in railway turnouts cause severe changes in the profile of the crossing-nose. To predict these changes, the whole system model (WSM) was developed, which uses extensive FEM simulations for the rail damage calculations that are very computationally intensive. To substitute these simulations and, thus, majorly enhance the overall performance of the WSM methodology, the semi-physical plasticity (SPP) metamodel has been developed. The SPP model is based on three foundational assumptions on the wear area, shape change area and wheel profiles envelope effects to reproduce the profile development of the crossing nose. The SPP results have shown an overall good correlation with the FEM results and, due to the semi-physical nature of the model, the computational time for such predictions was significantly improved as compared to the FEM simulations (seconds instead of weeks). The developed model will be useful for effective and time-efficient rail surface damage prediction and, as part of the WSM, contribute to the fast holistic track damage prognosis.
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