I need to know the resonant frequency of the default (6) modes on a frequency analysis on Simulaion Pro. I simply have an aluminum plate that have several small circuit boards (FR4 laminate material) fastened to it via 0-80 bolts/nuts. What I have done is instead of modeling the bolts and going through and applying contacts and loads on them, I just made them all Bolt Connections and applied a pound of axial load to each (just to start out). The problem is that I always get a warning message stating that there are no contact pairs on the bolt connections. I run the simulation anyway and my parts seem to just fly off the plate at only 2 Hz. I basically need to know what the frequencies are on the whole assembly. Frequency analysis does not allow for No Penetration on parts.