Modal Analysis and Component Mode Synthesis?

[oldninja]

Dear MOOSE Team,

I am interested in performing modal analysis and component mode synthesis (CMS) using the moose framework. However, I looked for these terms in the documentation, and I could not find any information about them. That's why I opened this discussion to see if anyone could point me in the right direction. I'm more interested in performing the CMS part, sometimes referred as "superelement" in NASTRAN or "substructure" in Abaqus/CalculiX (more info here, here, or here). Any help would be greatly appreciated!

Thanks,

[GiudGiud]

@dschwen @somu15 do you know who might know about this?

[somu15]

Tagging @cbolisetti and @lynnmunday. This may have something to do with Craig Bampton as per one of the shared documents.

[oldninja]

Craig Bampton

Yes, that is usually the underlying method either in Abaqus or Nastran.

[cbolisetti]

Yes, we have looked into implementing this in moose but never got funded. We don't have CMS/Craig Brampton right now, unfortunately.

[oldninja]

I see, thank you for letting me know.

[lynnmunday]

Here are some examples for modal anaylysis including eign analysis:
https://mooseframework.inl.gov/modules/solid_mechanics/1d_elastic_waves.html

If you're still interested in this, we have added some capabilities to do reduced order models that could probably be used to for super elements.