RAO OC3Hywind Turbine

Discuss theory and modeling of wind-turbine structures.

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Jason.Jonkman
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Re: RAO OC3Hywind Turbine

Postby Jason.Jonkman » Mon Nov 18, 2019 10:53 am

Dear Bertrand,

See my post dated Jan 10, 2018 in this forum topic above for details on this equation.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Bertrand.Canetti
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Re: RAO OC3Hywind Turbine

Postby Bertrand.Canetti » Mon Nov 18, 2019 5:15 pm

Oh...oops.

And yet I did read this message, but did not get it was the same equation... :roll:

Thank you, at least I got it now.

Best regards,
Bertrand

Bertrand.Canetti
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Organization: University College of Cork
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Re: RAO OC3Hywind Turbine

Postby Bertrand.Canetti » Wed Nov 27, 2019 8:44 am

Dear Jason,

I am slightly confused. Is the auto spectral density and the cross spectral density the equivalent of power spectral densities?

For example, would you confirm that:
- the wave power spectral density is the same as wave auto spectral density?
- the heave power spectral density is the same as the heave-wave cross spectral density?
- the RAO is equal to the auto spectral density divided by the cross spectral density?

Thank you for your help,
Best regards

Jason.Jonkman
Posts: 4394
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: RAO OC3Hywind Turbine

Postby Jason.Jonkman » Wed Nov 27, 2019 10:05 am

Dear Bertrand,

The auto-spectral density is the same as the power-spectral density. Here are my answers to your questions:
- the wave power spectral density is the same as wave auto spectral density?

Yes.
- the heave power spectral density is the same as the heave-wave cross spectral density?

No. The heave power spectral density is the same as the heave auto-spectral density.
- the RAO is equal to the auto spectral density divided by the cross spectral density?

No, you have this swapped. The RAO is equal to the output-wave cross-spectral density divided by the wave auto-spectral density, where "output" is any motion and/or load output from the simulation. For example, the heave RAO is the heave-wave cross-spectral density divided by the wave auto-spectral density.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Bertrand.Canetti
Posts: 23
Joined: Thu Oct 31, 2019 6:35 pm
Organization: University College of Cork
Location: Ireland

Re: RAO OC3Hywind Turbine

Postby Bertrand.Canetti » Thu Nov 28, 2019 1:34 am

Dear Jason,

Thank you for your answer.

Best regards
Bertrand


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