MemsGeek
Mechanical
- Oct 29, 2007
- 3
I am trying to use the ansys mode shapes for reduced order modeling outside of ansys. I have the displacements, but not the effective mass at each node. It seems like this should be trivial, but I am having trouble.
I can export the mass matrix, but these are element masses, not physical masses, and therefore depend on the specific shape functions of the elements. I tried using the lumped mass option in a modal analysis and wrote out the mass matrix using the hbmat command, but recognized that these masses were not simply the mass at each node.
So... If you wanted to get the effective mass attributed to each node in a lumped mass formulation, how would you do it?
I can export the mass matrix, but these are element masses, not physical masses, and therefore depend on the specific shape functions of the elements. I tried using the lumped mass option in a modal analysis and wrote out the mass matrix using the hbmat command, but recognized that these masses were not simply the mass at each node.
So... If you wanted to get the effective mass attributed to each node in a lumped mass formulation, how would you do it?
