Dear Sir
Bmodes require 7 properties at each section of the tower, for calculating the mode shapes. For the FAST8, Monopile supported tower, only the mass densities and the FA and SS stiffness along the tower are specified in the ElastoDyn_Tower file. How do i calculate the other properties?
I tried to compute the SS and FA mass moments of inertia’s using standard formulae, but got wrong values (i first checked it for the bottom section of the CS_monopile_tower_secs.dat file). I used the formula for a hollow cylinder:
I = 1/2 m ( ri^2 + ro^2)
also, i tried modifying the equation you mentioned in the post BModes flp_iner, for a hollow cylinder, but got nowhere near the correct value. Please help me out.
Sincerely
Abhinav