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Modeling of a 4-axle bogie vehicle   

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

1. Press button:  
2. Copy vehicle_BoBo_frame into a new directory

3. Go to the new directory and open file runf/Master.runf

4. Add couplings to the vehicle

5. Open file runf/Master.tsimf in nedit and create the following couplings:

   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
   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
   Ballast	Shell->Gensys->Ballast->Lateral

   
   
   
6. Create properties for the following couplings:

   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
   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
   Stiffness in contact point	Shell->Gensys->Contact point->linear
   Rail fastners	Shell->Gensys->Rail fastners->Concrete sleepers
   Ballast	Shell->Gensys->Ballast->Typical

   
   
   
7. The model is ready and calculations may now begin. Please mark file runf/Master.tsimf and select run with mouse button #3
   
   
8. Animate the simulation in Gplot by:
   • Mark file runf/Master.tsimf and press the Gplot button.
   • In Gplot press File->read_GPdat
   • Select ident gp/Master.gp
   • Press the Fwd button in the lower menu bar
   
   
9. 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.
   
   
10. Copy file runf/Master.tsimf into runf/critSpeed.tsimf. Open file runf/critSpeed.tsimf for editing. Introduce a track alignment error by changing line 109 from:
    func char ctrack_irreg= Ideal_track
    To:
    func char ctrack_irreg= Latshift_A5
    
    
11. Run file runf/Master.tsimf again
    
    
12. Load the new simulation into Gplot by selecting File->read_GPdat + gp/critSpeed.gp Please do not forget to use mouse button 2 when controlling scales and scrollbars in UNIX.
    
    
13. The deformation amplitude can be scaled under View->show_1_diag. In order to clearly see the motions Deformation scale fact could be set equal to 50.