Learning Forum

[Davide_P]

Hi dear community,

I performed an external Matlab analysis using a condensed (Craig Bampton) FEM model. Now, I should visualize the results into Ansys APDL in terms of condensed and expanded model. Unfortunately, i have no idea how to import these results and to print them along the FE model.

[ErKo]

Hello

are these results rst, and FEM model in an Ansys format (say cdb/inp and .rst) or?

Thank you

Erik

[Davide_P]

Hi Erik thanks for your reply. The FE model is entirely built in Ansys (also the condensed model) while the numerical results come from Matlab so their raw format is a .txt .
any suggestion?
I have to import the results into Ansys and to visualize the displacement map along the condensed/expanded FE model
Thank you
Davide

[ErKo]

Hi

That would not be possible (txt) for the results files - we would need to have them in a .rst format which is a binary (which you could not write from matlab).

Perhaps some of my colleagues have some other ideas ( ).

Thank you

Erik

[Davide_P]

Ok, thanks!
So, how can I convert .txt format into the .rst one?
Davide

[ErKo]

That is not possible since rst is binary proprietary ansys file.

Let's see if there is a workaround - my colleagues might be able to give some advice here.

Thank you

Erik

[Davide_P]

Ok thanks a lot.
I can wait your colleagues.
Davide

[ErKo]

Also see if paraview or an open source format can help somehow with viewing results.

All the best

Erik

[Davide_P]

Ok , i check it.
Let me know if your colleagues suggest something.
Thanks
Davide

[Davide_P]

i disturb you for an additional question: how can i export the CMS transformation matrix (T matrix) after the condensation?
I found on line some instruction for exporting mass and stiffness matrices but anything about this CMS transformation matrix.
Do you know something?
Thanks
Davide

[ErKo]

Hello

Have never tried this but check:

*DMAT command or IOkey option in CMSOPT command

Thank you
Erik

[Davide_P]

.
Thanks for your reply.
I found some instruction:
Chose the correct IOKEY output (CSM transformation matrix), see the picture
After the condensation, use the command *DMAT, "Matname", D, IMPORT, CMS, "file".cms, NOR (fixed interface modes) or CST (static constrained modes)
with the PRINT command you can print the matrices