Dear all,
I am working with BMODES and I have a question about the input for the 5MW Turbine:
Hier
wind.nrel.gov/public/jjonkman/BM … nopile.bmi
in the tower-top mass properties I reda the following:
3.500003109E+005 tip_mass blade-tip or tower-top mass (kg)
-0.4137754432 cm_loc tip-mass c.m. offset from the tower axis measured along x-tower axis (m)
1.9669893542 cm_axial tip-mass c.m. offset tower tip measures axially along the z axis (m)
4.370E7 ixx_tip blade lag mass moment of inertia about the tip-section x reference axis (kg-m^2)
2.353E7 iyy_tip blade flap mass moment of inertia about the tip-section y reference axis (kg-m^2)
2.542E7 izz_tip torsion mass moment of inertia about the tip-section z reference axis (kg-m^2)
0. ixy_tip cross product of inertia about x and y reference axes(kg-m^2)
1.169E6 izx_tip cross product of inertia about z and x reference axes(kg-m^2)
0. iyz_tip cross product of inertia about y and z reference axes(kg-m^2)
But then in the article:
“Modal Dynamics of Large Wind Turbines with Different Support Structures” from G. Bir and J. Jonkman I read the following values
which referring to the BMODES tower axes systems must be transformed from the the cm coordinate system to the tip-section reference axis . Is that right?
In this case, the input data of the CS_Monopile.bmi are not correct, I guess.
Any idea?
Thanks