How to export mass and stiffness matrices of a constrained model?

I'd like to export mass and stiffness matrices of a constrained model (e.g. MPC applied) and retain information on the ASET, i.e. the independent degrees of freedom. Is that possible somehow?

Up to now I've used to obtain the relevant matrices only under free-free conditon by using PARAM,EXTOUT,DMIGPCH

Best regards,

Johannes

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0 JohLut over 5 years ago

Thanks for your quick replies, Vivek and Don!

However, I'm still wondering how boundary conditions are considered in the MAA and KAA matrices...

By the way, what exactly is the difference between "PARAM,EXTOUT,DMIGPCH" and "EXTSEOUT (STIFFNESS MASS ASMBULK EXTID = 10 DMIGPCH)".

Why are there these two commands existing?
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0 JohLut over 5 years ago

Thanks for your quick replies, Vivek and Don!

However, I'm still wondering how boundary conditions are considered in the MAA and KAA matrices...

By the way, what exactly is the difference between "PARAM,EXTOUT,DMIGPCH" and "EXTSEOUT (STIFFNESS MASS ASMBULK EXTID = 10 DMIGPCH)".

Why are there these two commands existing?
Cancel
Vote Up 0 Vote Down

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Verify Answer

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