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 Vivek Bhardwaj over 5 years ago

You can use the same method, MSC Nastran takes care of SPC grids and MPC's. Only thing you need to care is to define ASET's not on dependent grids and SPC grids.

Other option you can use is : EXTSEOUT (STIFFNESS MASS ASMBULK EXTID = 10 DMIGPCH)
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0 Vivek Bhardwaj over 5 years ago

You can use the same method, MSC Nastran takes care of SPC grids and MPC's. Only thing you need to care is to define ASET's not on dependent grids and SPC grids.

Other option you can use is : EXTSEOUT (STIFFNESS MASS ASMBULK EXTID = 10 DMIGPCH)
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