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I (beginner) am using dymola to model half rail vehicle dynamic system for vehicle and pitch motions.

The model has only wheels, bogies, car body and spring-damper connections without inputs and prismatic joints. I only need vertical motion of each body and pitch of the Carbody w.r.t time. Although last variation has no errors, system is going down. What should I do? And I have the vertical track irregularity file as function of distance. I would be very glad for any answers.

https://drive.google.com/file/d/0B8AmxzbhEQ_FaVFCOTlvcWNnWE0/view?usp=sharing

Yusuf çatı
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    I suggest you add some error messages or something. It is hard to comment on this description alone. Is your model similar to [this one](http://www.mathworks.com/help/simulink/examples/automotive-suspension.html) (but for trains)? – Michael Tiller Jan 08 '15 at 15:52
  • A related question...does your model assume that the wheels are always in contact with the track? I would assume so, but I just wanted to confirm. – Michael Tiller Jan 08 '15 at 18:16
  • this variation in the link has no error but system is all going down. Every single body has its own position vector when add component fixed then I get the singularity error – Yusuf çatı Jan 09 '15 at 09:58
  • yes, wheels and track do not lose the contact – Yusuf çatı Jan 09 '15 at 10:48
  • Are you really interested in 3D motion? Or are you only concerned with the up and down motion of the suspension? – Michael Tiller Jan 09 '15 at 16:25
  • I am interested in 2d motion i.e, vertical motion and pitch of the car body by using multibody library if I can install the planar mechanics in the pc room of our chair I will try it – Yusuf çatı Jan 10 '15 at 13:57

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I think your best bet would be a library like this one:

https://github.com/dzimmer/PlanarMechanics

Michael Tiller
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