I did end up playing around with a small model to better understand why the math works the way it does. After that, going through your explanations again, it all makes sense —great explanation! Thank you!
I also have a copy of that book and have some training materials from MSC, so I’m planning...
dmapguru,
I understand that Kms.Kss^-1.Ksm represents the reaction forces on the m-set from the reduced s-set. This makes sense. But why do we then subtract it from kmm, which represents the existing forces on the m-set (again, assuming unit displacement on the m-set so F = K)? Why isn't it...
Thank you for the response! Yes, that is the source! The equation in that paper is the same as what I showed above. You don't necessarily have to remove all the nodes with zero force. In fact, you shouldn't. You must carefully pick the nodes to reasonably capture the mass distribution. The...
When a Guyan reduction is applied to a finite element model and reduced to a statically determinate number of degrees of freedom (1 node/6dof), why does the reduced stiffness matrix become zero? I've been trying to wrap my head around this all day, and I understand the intuition behind it. The...
