I used the EXTSEOUT (ASMBULK EXTID = 15 DMIGPCH) to extract mass, stiffness and viscous damping matrices as pch file. The pch file contains KAAX and MAAX entries showing elements of stiffness and mass matrices, but there is no BAAX for damping.
I used the EXTSEOUT (ASMBULK EXTID = 15 DMIGPCH) to extract mass, stiffness and viscous damping matrices as pch file. The pch file contains KAAX and MAAX entries showing elements of stiffness and mass matrices, but there is no BAAX for damping.
I tried PARAM,SESDAMP in my model, but still have the same problem. there is no BAAX in pch file. Can I send my dat file to you? It is a small beam model.
OK- this has several issues... 1) Since you do not have a QSET defined, no modes are being solved... so you need to add a QSET and SPOINTS; 2) You didn't actually define any modal damping... the SDAMP case control command points to a nonexistent TABDMP1 bulk data entry; 3) you have PARAM,KDAMP,-1 defined, which if there were any modal damping would convert it to structural damping and it would get added to the K4AAX matrix (which you get due to structural damping, GE being defined on the material entry)...
But, this is also expecting an ASET to reduce the structure to... after all, this is a SE creation run so usually you have an ASET defined for reduction.
The attached run works as you expect, but I arbitrarily selected grids 3 and 7 for the ASET.
I'm not certain of your original intention in exporting these matrices.
Sorry- I attached the incorrect file... see this one. But, I don't think this is what you are really looking for, as to use this you must have an ASET that is less than the total DOF in the problem.
What specifically are you wanting, and for what use?
I have not run mod2 yet, because I left the office. I am going to create state space representation of the structure, for this purpose I need M(mass), K(stiffness) and C (viscous damping) matrices. As I checked qrg using EXTSEOUT card, I can get these matrices elements as MAAX, KAAX and BAAX, respectively in a pch file. In my pch file MAAX, KAAX are stored, but there is no BAAX.
