Sorry to dig up this old thread, but I have similar questions regarding the rotational inertia of the 5MW offshore spar-buoy (OC3) rotor. I’m trying to determine the inertia about the LSS so I’m starting with the “Rotor Inertia” from my .fsm file (38759236 kg-m^2).
I see that this is ‘at the blade root’ and needs to be translated to the LSS, I assume via parallel-axis. However there is no orientation about this given Rotor Inertia at the root. Is it parallel to the LSS? And would my distance (in the parallel-axis theorem) simply be the radius of the hub?
Perhaps more straight to the point is: Is the rotor inertia (hub and blades as per Rotor inertia) reported in the .fsm file an inertia about the LSS? Thanks for any help!