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Dymola - OpenModelica incompatible for MultiBody

#2417  Permalink Top

Dymola - OpenModelica incompatible for MultiBody

Jun-12-12 00:00:35

Hello,
It occured to me that complex multibody systems that are created in Dymola using the Standard library 3.2 do not work in OpenModelica. OM freezes during compilation. Only very simple multibody systems work in OM.

What is the reaseon for that?
Are there special modeling rules for OM?

This problem intensifies as soon as I implement my own created MultiBody components, such as nonlinear spring, deformable body, etc., in a model.
All these components work fine in Dymola.

Do I have to follow any special coding rules in order to make my own created components work in OM?

Thank you very much

#2418  Permalink Top

Re: Dymola - OpenModelica incompatible for MultiBody

Jun-12-12 08:07:35

Hi,

We have issues with MultiBody models based on MSL 3.2 because the gravityAccelerationFunction is replaceable.

I suggest you use MSL 3.1 as we are far better there (about 8-9 examples models do not simulate correctly):
http://test.openmodelica.org/~marsj/MSL … rsive.html
http://test.openmodelica.org/hudson/job … /simulate/

Cheers,
Adrian Pop/

#2429  Permalink Top

Re: Dymola - OpenModelica incompatible for MultiBody

Jun-13-12 20:03:55

Hello Adrian,

Thank you for your quick response. From your perspective, which version of MSL and OpenModelica would you recommend to use? All we need is the MultiBody library, so would it make sense to use MSL 2.2.2 and an older release of OM?

Thank you
Adrijan Ribaric

#2432  Permalink Top

Re: Dymola - OpenModelica incompatible for MultiBody

Jun-14-12 09:18:15

No, MSL 2.2 MultiBody does not work in the OM backend (it will pass flattening so MathModelica can simulate the model in their backend).
If you want to use MultiBody with OM, MSL 3.1 is the only way to go (as Adrian suggested).

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