currently I am interested in determining the rigid body properties of a softly supported engine. I understand that it should be doable to get the moments of inertia and the COG by FRF measurements. But as I don't have experience doing this I would like to know if there is an example or a manual on this add on? I've been doing modal analysis but haven't used that add-on. For comparison of my results I do have CAD based moments of inertia and COG data so I can check that I get plausible results.