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Modelling and Simulation of Rail Vehicles

Introduction
A complete railroad vehicle
Wheel/rail geometry
Designed track geometry and track irregularities
Creating railway vehicles from scratch
Miscellaneous

Introduction

• Why do we use vehicle dynamics
• An overview over the GENSYS software package
• The UNIX environment
• Create a sine wave
• Open the file manager program "caja".
  Click the -icon in the lower left of the desktop.
• Click on the short-cut
  Here you can see all available tutorials in Gensys.
• Open a second caja window by clicking the -icon again.
• Go to the directory where you want to work.
  E.g. Create a work space in directory "/home/gensys/gensys/analyze" named "course".
  This can be done by selecting "Create Folder" with mouse button #3
• In the pulldown menu "Bookmarks", select "Add Bookmark", to make it easier to go to this directory again.
• Copy directory "intro_tutor_1_sine" from the "tutorial"-window to the "course"-window.
  Please do not edit the files in the "tutorial"-directory, only work with the files located in the "course"-directory.
• In the caja-window, descend into directory "course".
  
• Mark directory "intro_tutor_1_sine" and select "Open With gensys" with mouse button #3
• The Gensys file manager program has now started.
  We will continue to work with the Gensys-files from here.
• Double-click file README.html and select open->run with mouse button #3.
  Alternatively run the file by pressing CTRL+R on the key-board.
• Follow the instructions given in the file
• Create and analyze a car-body resting on four coil-springs
• Do the same steps as above, but this time copy directory "intro_tutor_2_car-body" instead
• Descend into the newly copied directory
• Double-click file README.html and select open->run with mouse button #3.
  Alternatively run the file by pressing CTRL+R on the key-board.
• Follow the instructions given in the file

A complete railroad vehicle

• Description of the input data file
• Get acquainted with the model (debugging)
• Before the actual calculations starts, it is advisable to be well acquainted with the model first. Spending a day or two with debugging the model, can save you a lot of time in the end of the project.
• Some tips on what to check are given here: Debugging a vehicle model
• Create and analyze a complete railroad vehicle
• Follow the steps described under "Create a sine wave" above, but this time copy directory "intro_tutor_3_bobo_pe3-body" instead
• Descend into the newly copied directory
• Double-click file README.html and select open->run with mouse button #3.
  Alternatively run the file by pressing CTRL+R on the key-board.
• Follow the instructions given in the file
In above example steps 1-11 describes debugging of the model. After these introductionary steps the analysis can start.
Comparing files e.g.:

opdiff runf/tang_ideal.tsimf runf/R600_ideal.tsimf

Comparing directories e.g.:

opdiff_dir -r /home/gensys/gensys/homepage/tutorial/intro_tutor_3_bobo_pe3

Rename an ident e.g.:

genrename mytest1. proper_name.

Wheel/rail geometry

• Dimensions in the wheel/rail interface
• Equivalent conicity
• Rolling steering index
• Output quantities
• Lubrication formula
• Creating profiles from drawing or measurements
• Different ways to model the wheel/rail interface in a mechanical model
• Animate the wheel/rail interface in program GPLOT
• Create wheel/rail geometries
• Follow the steps described under "Create a sine wave" above, but this time copy directory "kpf" instead
• Go to the newly created directory and double-click file README.html and run the file by pressing CTRL+R




Designed track geometry and track irregularities

• Create designed track geometry
• Create track irregularities
• Classify track irregularities
• Create and Evalulate a track
• Follow the steps described under "Create a sine wave" above, but this time copy directory "track" instead
• Go to the newly created directory and double-click file README.html and run the file by pressing CTRL+R




Creating railway vehicles from scratch

• Modeling of a 4-axle bogie vehicle
• Checking and debugging the input data model
• Modeling of a 4-axle bogie vehicle, hands on
• Copy a model from directory free_models




Miscellaneous

• Searching in the documentation
• Other couplings and masses not used in the previous examples
• Writing own user defined coupling elements
• gensys/homepage/tutorial
• gensys/free_models
• Catenary system
• Road vehicle