platform-pitch natural frequency of the IEA 22MW FOWT

[yangyangyang98]

I would like to inquire about the platform-pitch natural frequency of the IEA 15MW semi-submersible floating wind turbine, as well as the natural frequency and damping ratio used by the pitch controller，as I could not find them in “Definition of the IEA Wind 22-Megawatt Offshore Reference Wind Turbine”. Thanks.

[gbarter]

A bit confused on the question here- You are asking about the 15-MW properties by referencing the 22-MW report? Please see the 15-MW repository and floating-specific report.

[yangyangyang98]

Dear @gbarter
Sorry, my expression was incorrect. What I want to ask is the relevant data of IEA 22MW FOWT. I could not find the platform-pitch natural frequency, as well as the natural frequency and damping ratio used by the pitch controller in “Definition of the IEA Wind 22-Megawatt Offshore Reference Wind Turbine”. Thanks.

[dzalkind]

Hi @yangyangyang98,

The natural frequency and damping ratio of the pitch controller can be found here;; they are a function of the wind speed (U_pc).

The natural periods of the whole floating system, computed by RAFT, are as follows:

raft.surge_period,output,s,107.89755534840653,Surge natural period
raft.sway_period,output,s,108.43499424953963,Sway natural period
raft.heave_period,output,s,17.398511845041778,Heave natural period
raft.roll_period,output,s,27.281517618297688,Roll natural period
raft.pitch_period,output,s,27.292493450388193,Pitch natural period
raft.yaw_period,output,s,83.92729757773289,Yaw natural period

It was perhaps an oversight of mine to not include these in the report. Should we host the WISDEM/WEIS outputs in this repo, @gbarter?

[gbarter]

Maybe we could add it to the FAQ?

[dzalkind]

Updated!

[yangyangyang98]

Thank you for your helpful answer！