Search found 11 matches

by Thanasis.Petridis
Fri May 17, 2019 5:13 pm
Forum: Computer-Aided Engineering Software Tools
Topic: 5MW fatigue DEL calculation
Replies: 28
Views: 11716

Re: 5MW fatigue DEL calculation

Dear Jason,

thank you very much for all your immediate responses, even on irrelevant-to-NREL questions.

Best regards

Thanasis Petridis
by Thanasis.Petridis
Fri May 17, 2019 4:42 pm
Forum: Computer-Aided Engineering Software Tools
Topic: 5MW fatigue DEL calculation
Replies: 28
Views: 11716

Re: 5MW fatigue DEL calculation

Dear Jason, So, if k=2 and mean wind speed is a fixed value, Weibull scale parameter is also a fixed value [c=(2*v_average)/(sqrt(π))]. My actual wind data and their probabilty of occurance are not accounted anywhere. Is this a safe assumption? Or did I misinterpret something? Thank you, Best regard...
by Thanasis.Petridis
Fri May 17, 2019 9:32 am
Forum: Computer-Aided Engineering Software Tools
Topic: 5MW fatigue DEL calculation
Replies: 28
Views: 11716

Re: 5MW fatigue DEL calculation

Dear Jason, thank you for your response, yet I don't quite understand your last sentence (that is, "Often though, loads analysis is based only on generic wind classes defined in the IEC standards."). Possibly I did not understand, since I have never taken a look at IEC standars other than ...
by Thanasis.Petridis
Fri May 17, 2019 8:22 am
Forum: Computer-Aided Engineering Software Tools
Topic: 5MW fatigue DEL calculation
Replies: 28
Views: 11716

Re: 5MW fatigue DEL calculation

Dear Jason, hello again. I have one more question regarding the Weibull parameters needed in MLife. Since, most Weibull distributions regard wind speeds at u 10 (wind speed 10m above ground), the weibull scale and shape factors are also calculated for these wind speeds. So, when I need to input thes...
by Thanasis.Petridis
Thu May 16, 2019 12:12 pm
Forum: Computer-Aided Engineering Software Tools
Topic: 5MW fatigue DEL calculation
Replies: 28
Views: 11716

Re: 5MW fatigue DEL calculation

Dear Jason, the seed in FAST's HydroDyn module is found in the Platform file (for the offshore 5MW monopile-supported wind turbine) right? 6 seeds should be enough? So for every wind speed I still need 6 seeds in total (66 simulations for DLC 1.2). Thank you again for everything Best regards, Thanas...
by Thanasis.Petridis
Thu May 16, 2019 12:00 pm
Forum: Computer-Aided Engineering Software Tools
Topic: 5MW fatigue DEL calculation
Replies: 28
Views: 11716

Re: 5MW fatigue DEL calculation

Dear Jason,

everything is now settled. Thank you very much for everything and for your immediate responses.

So the seeds in FAST can be fixed, yet in TurbSim should take at least 6 different.

Best regards,

Thanasis Petridis
by Thanasis.Petridis
Thu May 16, 2019 10:36 am
Forum: Computer-Aided Engineering Software Tools
Topic: 5MW fatigue DEL calculation
Replies: 28
Views: 11716

Re: 5MW fatigue DEL calculation

Dear Jason, thank you very much for your immediate response. You've been really helpful, but I have a couple questions to fully understand how to proceed. 1) The 6 seeds refer only to the primary input file for FAST? Or should I try different seeds with TurbSim too? (And finally generating more than...
by Thanasis.Petridis
Wed May 15, 2019 4:47 pm
Forum: Computer-Aided Engineering Software Tools
Topic: 5MW fatigue DEL calculation
Replies: 28
Views: 11716

Re: 5MW fatigue DEL calculation

Dear Jason, I'm deeply sorry if the answer is already written and I didn't manage to find it, yet I need to clarify a few things regarding Fatigue and MLife. First of all, I am working on the 5MW offshore wind turbine by NREL supported on a monopile and I use FAST v7. Since, I already check my struc...
by Thanasis.Petridis
Sat Feb 09, 2019 3:40 pm
Forum: Computer-Aided Engineering Software Tools
Topic: NREL 5MW controls (DLL interface)
Replies: 21
Views: 20626

Re: NREL 5MW controls (DLL interface)

Mr. Jonkman hi, I ecountered some problems which I still haven't solved and I would appreciate your help. First of all, I use your 5-MW offshore wind turbine as a model. I modified it for my site (15m depth, 92.6m Hub height, tower height 77.6m). So, as you can see the differences are just small. I ...
by Thanasis.Petridis
Mon Dec 03, 2018 9:43 am
Forum: Structural Analysis
Topic: Turbine-soil interaction. Influence on the mode shapes.
Replies: 64
Views: 27396

Re: Turbine-soil interaction. Influence on the mode shapes.

Dear mr Jonkman,

thank you for your immediate response. You have made everything clear to me.
My last question doesn't really matter now that I don't need to use HydroDyn.
Again thank you very much, you have been really helpful.

Best regards,

Thanasis Petridis
by Thanasis.Petridis
Mon Dec 03, 2018 7:52 am
Forum: Structural Analysis
Topic: Turbine-soil interaction. Influence on the mode shapes.
Replies: 64
Views: 27396

Re: Turbine-soil interaction. Influence on the mode shapes.

Dear mr Jonkman, I tried to read most of forum's topics before posting, but I still have some questions. I am a new user of FAST v7 and I am currently trying to use it for my master thesis. I try to study a new 5MW OWT, so I need to figure out my turbine's properties in order for it's frequency to b...

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