### System modules

### Presentations

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*Basics of PBS Analysis in Universal Mechanism software*

Presentation is devoted to using Universal Mechanism software for PBS analysis of road trains.

Read more*Simulation of Road Vehicle Dynamics Using Universal Mechanism Software*

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*Computer simulation of train-track-bridge interaction*

The aim of the paper is to present the approach for simulation of dynamics of the systems consisting of railway vehicle, flexible track and flexible foundation.

Railway vehicles are considered as multibody systems that include rigid or flexible bodies, joints and force elements. The track model is considered as a periodic 3D structure consisting of rails, pads and sleepers on a flexible foundation. Two rails modelled as Timoshenko beams are discretely supported on the sleepers through the railpads and fasteners, that are modelled as nonlinear force elements. The foundation (bridge, tunnel, overpass) is considered as a flexible multibody system simulated using finite element method.

Vertical response of the track model is verified through comparison with experimental data. Test case of simulation of suburban 6-car train on a flexible railway track and three sections of U-like flexible railway bridge of 30 m each is shown. Comparison of the simulation results with experimental data is given.

Read more*Simulation of Railway Vehicle Dynamics Using Universal Mechanism Software*

**New!** Conventional railway models, models with flexible car bodies and bogie frames, wheel-to-rail contact models, flexible track models, vehicle-track-bridge interaction, rolling contact fatigue, wheel and rail profile wear, stability and safety of railway vehicles: listed above and other questions are considered.

*Railway vehicle and bridge interaction: some approaches and applications*

Presented approach is based on method of dynamic simulation of flexible bodies which is implemented in UM software.

Read more*Simulation of flexible rail track dynamics*

The approach to simulation of flexible railway track dynamics in Universal Mechanism software is considered. The approach supposes considering rails as Timoshenko beams and slippers as rigid bodies or Euler-Bernoulli beams.

Read more*Real-time model for simulation of tracked vehicles*

A massless track-wheel-terrain interaction model for the real-time simulation of tracked vehicles is suggested. The model is oriented for simulation of tracked vehicles on highly non-smooth urban and industrial terrains that include such elements like stairs, vertical obstacles etc.

Read more*Simulation of drillstring dynamics*

The various issues of simulation of drillstring dynamics using the multibody approach are considered. Different multibody models of the whole drillstring and the bottom hole assembly are discussed. Comparison of the numerical simulation, theoretical and experimental results is presented.

Read more*Simulation of Derailments*

Presentation is devoted to simulation of train derailment processes and the identification of causes of derailments by using Universal mechanism software.

Read more*Three-Piece Bogie Models*

Presentation is devoted to models of freight cars based on three-piece bogies and its applications.

Read more*UM RCF Presentation*

Presentation is devoted to simulation of accumulation of contact fatigue damages in railway wheels with the help of Universal Mechanism software. Simulation is supported by UM RCF module.

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