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Modeling of a 4-axle bogie vehicle   

In this session a railway vehicle shall be created from scratch.

1. Copy directory "vehicle_BoBo_frame" to "vehicle_BoBo_frame_test"
2. Go to the new directory
3. Copy file runf/Master.runf to runf/tang_ideal.tsimf
4. Open file runf/tang_ideal.tsimf in editor nedit
5. In the file many things are already created: track irregularities, designed track geometry, wheelsets, bogie masses and car-body mass. However the model do not have any couplings between the masses except for the connection between wheel and rail.
6. Search for the text string "Add couplings between the masses" and add your couplings here
   
   
7. In editor nedit click "Shell -> GENSYS -> The dotted tear-off line" From the tear-off popup-menu create the following couplings in the secondary suspension:

   Coupling:	In Menubar Select:
   Secondary coil springs	Shell->Gensys->Secondary susp->Coil springs car-bogie
   Anti-roll bars	Shell->Gensys->Secondary susp->Anti-roll bars
   Traction rods	Shell->Gensys->Secondary susp->Traction rods
   Lateral bumpstops	Shell->Gensys->Secondary susp->Lateral bumpstops
   Vertical bumpstops	Shell->Gensys->Secondary susp->Vertical bumpstops
   Lateral viscous dampers	Shell->Gensys->Secondary susp->Lateral viscous dampers
   Vertical viscous dampers	Shell->Gensys->Secondary susp->Vertical viscous dampers
   Yaw viscous dampers	Shell->Gensys->Secondary susp->Yaw viscous dampers

   
   
   
8. From the tear-off popup-menu create the following couplings in the primary suspension:

   Coupling:	In Menubar Select:
   Primary springs	Shell->Gensys->Primary susp->Springs
   Primary Lateral bumpstops	Shell->Gensys->Primary susp->Lateral bumpstops
   Primary Vertical bumpstops	Shell->Gensys->Primary susp->Vertical bumpstops
   Primary Vertical viscous damper	Shell->Gensys->Primary susp->Vertical viscous damper

   
   
   
9. The model is ready and calculations may now begin. Mark file runf/tang_ideal.tsimf and select run with mouse button #3
   
   
10. Animate the simulation in Gplot by:
    • Mark file runf/tang_ideal.tsimf and press the Gplot button.
    • In Gplot press File->read_GPdat
    • Select ident gp/tang.gp
    • Press the Fwd button in the lower menu bar
    
    
11. As can be seen in the animation not very much happens. The animation shows a time-domain simulation on tangent track without track irregularities with perfect initial conditions. This is good because now we know the model is in balance. If the vehicle is making any motions it indicates that something is not quite right in the model.
    
    
12. Please continue the tutorial with analyse_check.html, to debug the model.