I have a modal system that contains two parts, each constrained to ground. I would like to insert a zero displacement condition between points on each of the parts' extremeties. This is for validation of another software, which is why it is very simplified. It seems like a rigid link should do the trick, although I don't have an advance license and can't use advance rigid links, which I assume would have the ability for the link vector not to change. However, even when I try inserting a rigid link, the analysis fails. Also, a spring idealization doesn't affect the system at all. Is there something about modal analysis that is incompatible with these tools?
As always, I've been super disappointed with the Creo knowledge base. I don't even know where to begin looking for info.