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 Don.Graff 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.

The PARAM method was an earlier means of getting the reduced matrices out of Nastran in a DMIG format. The EXTSEOUT command is a newer means of reducing and exporting a Nastran External Superelement… this has many additional option over the older PARAM method.
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0 Don.Graff 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.

The PARAM method was an earlier means of getting the reduced matrices out of Nastran in a DMIG format. The EXTSEOUT command is a newer means of reducing and exporting a Nastran External Superelement… this has many additional option over the older PARAM method.
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