Hi all,
do you know how to read the stiffness matrix?
I've read of a method for understand whether the K matrix is ill-conditioned.
It consist in the calculus of the condition number of K expressed as the ration between the max and min value of the eigenvalues of K.
How can I do this? (also utilizing Mathcad)
Giulio
You're not wrong, but a) you can come close to K eigenvalues if you choose M small --> use a very low specific mass.
2) if you go for normal modes (even with correct mass) and you look at modeshapes, they should deform your structure in a natural way.
A poorly conditioned mesh would clearly show up in strange mechanisms that seem to appear in your structure. I can trigger this in Nastran by making an ugly mesh. I've not been able to trigger this in simulate.
The other answer is: I do not know how to get the stiffness matrix as output.
Erik
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