Generate new mode shapes for the 5MW ITIBarge4 wind turbine

[Xin.Tong]

@Jason.Jonkman

Dear Xin,

I’m not sure that we’ve published this, but–as derived from FAST linearization analysis–the linearized mooring stiffness of the ITI Energy barge about the undisplaced position is (with units of N/m, N/rad, N-m/m, N-m/rad):

15920.0, 0.0, 0.0, 0.0, 144700.0, 0.0
0.0, 15920.0, 0.0, -144600.0, 0.0, 0.0
0.0, 0.0, 24930.0, 0.0, 0.0, 0.0
0.0, -144500.0, 0.0, 38740000.0, 0.0, 0.0
144500.0, 0.0, 0.0, 0.0, 38740000.0, 0.0
0.0, 0.0, 0.0, 0.0, 0.0, 2797000.0

Best regards,

Dear Jason,

Thank you very much for your reply. According to the topic BModes : Input parameters about tower support subsystem - #13 by Ha.Tran, to obtain the “mooring_K” matrix in the BModes input file, the (4,4) and (5,5) elements of the above linearized mooring stiffness matrix of the ITI Energy barge about the undisplaced position should be added by -mgz. Where can I find the value for the parameter z please? Thank you for your feedback.

Yours sincerely,
Xin