Detail publikace

Numerical Analysis of Dynamical Response in Railway Switches and Crossings

SALAJKA, V. SMOLKA, M. PLÁŠEK, O. KALA, J.

Originální název

Numerical Analysis of Dynamical Response in Railway Switches and Crossings

Anglický název

Numerical Analysis of Dynamical Response in Railway Switches and Crossings

Jazyk

en

Originální abstrakt

Extreme stresses in all components of permanent way occur in switches and crossings during the passage of railway vehicles. Additional dynamic loading originates from changes in the track stiffness along the railway turnout, or alternatively from impact forces caused at points with geometrical imperfections. The stresses can be reduced by controlling track stiffness using rail fastenings with rail pads of different elasticity, or special elastic pads in slide plates in switches. 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 (Q and Y forces). 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. The obtained excitation forces are backwards applied in the dynamic response calculation by the FEM. Dynamic response is analyzed by the direct integration of differential kinetic equations. The analyses described above were used as a tool for the design of track stiffness controlled by rail pad elasticity. The final arrangement of rail fastenings in the switches and crossings of a typical turnout structure was obtained via the optimization of the dynamic response within the interaction between railway track and vehicle.

Anglický abstrakt

Extreme stresses in all components of permanent way occur in switches and crossings during the passage of railway vehicles. Additional dynamic loading originates from changes in the track stiffness along the railway turnout, or alternatively from impact forces caused at points with geometrical imperfections. The stresses can be reduced by controlling track stiffness using rail fastenings with rail pads of different elasticity, or special elastic pads in slide plates in switches. 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 (Q and Y forces). 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. The obtained excitation forces are backwards applied in the dynamic response calculation by the FEM. Dynamic response is analyzed by the direct integration of differential kinetic equations. The analyses described above were used as a tool for the design of track stiffness controlled by rail pad elasticity. The final arrangement of rail fastenings in the switches and crossings of a typical turnout structure was obtained via the optimization of the dynamic response within the interaction between railway track and vehicle.

Dokumenty

BibTex


@inproceedings{BUT164896,
  author="Vlastislav {Salajka} and Marek {Smolka} and Otto {Plášek} and Jiří {Kala}",
  title="Numerical Analysis of Dynamical Response in Railway Switches and Crossings
",
  annote="Extreme stresses in all components of permanent way occur in switches and crossings during the passage of railway vehicles. Additional dynamic loading originates from changes in the track stiffness along the railway turnout, or alternatively from impact forces caused at points with geometrical imperfections. The stresses can be reduced by controlling track stiffness using rail fastenings with rail pads of different elasticity, or special elastic pads in slide plates in switches.
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 (Q and Y forces). 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. The obtained excitation forces are backwards applied in the dynamic response calculation by the FEM. Dynamic response is analyzed by the direct integration of differential kinetic equations.
The analyses described above were used as a tool for the design of track stiffness controlled by rail pad elasticity. The final arrangement of rail fastenings in the switches and crossings of a typical turnout structure was obtained via the optimization of the dynamic response within the interaction between railway track and vehicle.

",
  booktitle="Applied System Innovation - Proceedings of the International Conference on Applied System Innovation, ICASI 2015",
  chapter="164896",
  doi="10.1201/b21811-233",
  howpublished="online",
  year="2015",
  month="may",
  pages="1163--1168",
  type="conference paper"
}