Abstract
A procedure for the numerical analysis of the dynamic response during the passage of railway vehicles is described. The solution is based on the finite element method (FEM), which is used for the calculation of track stresses. An FEM model was used with a fine structure that included all components of switches and crossings, including movable parts. The excitation forces are defined on the basis of the assumed interaction between track and vehicle. The track stiffness defined by FEM analyses is used for the calculation of dynamic vertical and lateral wheel load. A special model of a railway vehicle was built with the aim of calculating the forces at points where abrupt stiffness changes occur, as well as geometrical imperfections in the frog structure.
Highlights
Switches behaviour optimization from the perspective of reduction of the responses of dynamic effects during vehicles passages brings the need for creation of comprehensive computational geometrically complex models with an appropriate degree of simplification
Numerical solutions using mathematical models created in the finite element method (FEM) comprise a turnout superstructure and substructure including structural layers
The extreme stresses in all components of permanent way occur in switches and crossings during a passage of railway vehicles
Summary
Switches behaviour optimization from the perspective of reduction of the responses of dynamic effects during vehicles passages brings the need for creation of comprehensive computational geometrically complex models with an appropriate degree of simplification. Searching for the optimal switches arrangement design is based on numerical analyses of the specified J60-1:12-500 turnouts including the analyses of the individual rail fastening of the turnout with corrections related. The FEM are used in which detailed global numerical models of the turnout are created is applied for the calculation. The verified rail fastening using the partial FEM models are put into the global models of the switches on which the dynamic analysis of the vehicle travel effect was carried out. Alternative solutions of responses provided a possibility to determine a suitable solution of the structural arrangement in terms of the strength and the dynamic behaviour with the aim of the turnout life extension
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