Thank you very much! I made a lot of progress with the tips you gave me!
I made the set with flexbodies and ran the static+linear analysis. With that I was able to find the modes and natural frequencies of the system. However, it didn't match the ones I found in the algebric analysis in Matlab. Most of modes in the Static+linear analysis presented some sort of torsion or buckling so the modes and natural frequencies presented in the analysis were a lot different from what I expected. No matter wich joints I used, trying to prevent the torsion and buckling from happening, the frequencies would only assume higher values.
Later on, I tried to build the set using NLFE beams, but with this method, the static+linear analysis would deliver an error presenting only the transient mode and not the other vibration modes.
Is there a way to get the modes and natural frequencies of a simulation with NLFE?
Is there something I could do to make the flexbodies simulation to work?
Thanks again for your help!