Run a structural transient on only one part of a system
i have a structure from which i want the modes use them in a modal superposition to get their displacements resulting from a given input. I am only interested in several parts of the whole thing, so i don't want to run the transient on the whole structure (to save time and memory).
Is there a simple way to expand the modes on several parts (sub parts) only and run the mode superposition on them afterward? I expect some kind of cmsel and something afterward should make the job, but i don't know how to make it work.
Thank you in advance!