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

"The ASET is what is left over after SPC (constraints), AUTOSPC, MPC dependencies (rbe1, etc), and any explicit ASET (or OSET) entries are taken care of."

That's what I was assuming, too.

I asked about the boundary conditions because the matrices' dimensions are somewhat inconsistent.

Although the dimensions of my matrices are reduced properly when I apply only MPC, this is not the case when I consider static displacement BC. More specifically, the resulting matrix dimensions in the latter case are equal to those I get under free-free conditions.
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0 JohLut over 5 years ago

"The ASET is what is left over after SPC (constraints), AUTOSPC, MPC dependencies (rbe1, etc), and any explicit ASET (or OSET) entries are taken care of."

That's what I was assuming, too.

I asked about the boundary conditions because the matrices' dimensions are somewhat inconsistent.

Although the dimensions of my matrices are reduced properly when I apply only MPC, this is not the case when I consider static displacement BC. More specifically, the resulting matrix dimensions in the latter case are equal to those I get under free-free conditions.
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