NWTC

Dear Bonnie, Thank you for your reply. I didn't make any change the include path of creat_FAST_SFunc.c. I know that I can use creat_FAST_SFunc.c to generate the .mexw64 file. I don't know if I well understand what you said, my understanding is: If I want to use the creat_FAST_SFunc.c to built model ...

Dear all, I want to make a connection between the SIMULINK FAST nonlinear model and DSpace. I need to Build Model in the SIMULINK, but when I went to this step, the following errors appear. COMPILING "..\FAST_SFunc.c" In file included from C:/PROGRA~1/Matlab/R2012b/extern/include/mex.h:58,...

Dear Jason,

I appreciate your help, my last question is, is there any link between the FlapDOF1 and blade root flap-wise bending moment?

Best regards,
Cheng

Dear Jason. Thank you. Actually, no matter which index I use. I think the inputs of IBP controller have the following options, I don't know which one is better 1. The variation (with respect to an operating point) of the blade root moments; the control objective is to reduce such variation to zero ....

Dear Jason, Thank you for your fast reply. I remembered I asked you a similar question about the fatigue load evaluation in this forum https://wind.nrel.gov/forum/wind/viewtopic.php?f=30&t=2004&start=45 . I only have a single time series of results, you recommend me to use STD or RMS of mome...

Dear all, I have a question about the reduction of blade fatigue load. As far as I know, I can use individual blade pitch control to reduce the blade load. In order to design the controller, I need the information of blade flap-wise root moments. The question is, if I want to reduce the fatigue load...

Dear Jason,

Thank you!
I found that T and T_a in the outlist represent fairlead force and anchor force respectively. It is always there, but I never take notice of them...

Best regards,
Cheng

Hello,

Could anyone tell me how to get loads of the mooring lines from FAST 8 ?
The model I used is OC3Hywind, I didn't find any information about the mooring line load from the User's Guide.

Many thanks,
Cheng

Dear Marie, Hello, I can't open your link, and I am not familiar with DTU 10 MW Turbine, but as far as I know, the smallest controller response natural frequency must be lower than the smallest support-structure natural frequency to avoid the negative damping. For example, you used the PI gains of O...

Dear Dr. Jason,

Thank you very much for your detailed answer!
It's very helpful.

Best regards,
Cheng

Dear Dr. Jason, Thank you for your reply! I made some modification according to your comments, 1. I used m = 4 for towers and m = 10 for the blade and made the same DEL calculation, the normalized DEL results hardly changed. 2. Yes, I don't know how to use Goodman correction, so I didn't use it. If ...

Dear Dr. Jason, I made several kinds of sliding mode controllers of floating wind turbines with OC3 spar-buoy platform, and I calculated the DEL (TwrBsMxt, TwrBsMyt, TwrBsMzt, RootMxb1, RootMyb1) by using Mlife. However, the DEL results of different controllers are similar. For example, I compared t...

Dear Jason,

I have a controller that reduced the platform roll by -20% and platform pitch rate by -25% comparing with GSPI.
But the DEL of tower base side-to-side and fore-aft moment almost same as GSPI. Is it normal?

best regards,
Cheng

Dear Jason,

Thank you!
Now, it is clear to me.

Best regards,
Cheng

Dear Jason, Thank you! I'm confused that, 1). Do a high vibration of the drivetrain-torsion means a high variation of the rotor speed? 2). In my opinion, performance is highly related to the control algorithm. If I introduce additional control input (generator torque), the control is different from ...