Resonance frequencies

Wind & Water Computer-Aided Engineering Software Tools
1

Dear Jason,

I’m trying to find the resonance frequencies of surge and pitch, but in the simulation results I can’t see any resonances. I have changed the pitch stiffness, AxCds and MemberCds, but I can’t see any changes in the results. Also I have turned on the towerDofs but I can’t see the 3p resonance. Could you tell me what the reason could be?
Attached I’m sending the plos for two AxCds.

Best regards
Masih
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2

Dear Masih,

I’m sorry, but I’m not really sure I understand your question. When you say AxCds and MemberCds, are you referring to AxCd, MemberCd1, and MemberCd2 from the HydroDyn input file? Are you using white-noise wave excitation to identify resonances?

Best regards,