Search found 59 matches

by Cheng.Zhang
Thu Nov 21, 2019 6:44 am
Forum: Computer-Aided Engineering Software Tools
Topic: FAST8 Build Model problems
Replies: 3
Views: 163

Re: FAST8 Build Model problems

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 ...
by Cheng.Zhang
Wed Nov 20, 2019 5:49 am
Forum: Computer-Aided Engineering Software Tools
Topic: FAST8 Build Model problems
Replies: 3
Views: 163

FAST8 Build Model problems

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,...
by Cheng.Zhang
Wed Oct 30, 2019 7:29 am
Forum: Controls
Topic: Fatigue load reduction of bldae
Replies: 7
Views: 337

Re: Fatigue load reduction of bldae

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
by Cheng.Zhang
Wed Oct 30, 2019 3:49 am
Forum: Controls
Topic: Fatigue load reduction of bldae
Replies: 7
Views: 337

Re: Fatigue load reduction of bldae

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 ....
by Cheng.Zhang
Tue Oct 29, 2019 11:01 am
Forum: Controls
Topic: Fatigue load reduction of bldae
Replies: 7
Views: 337

Re: Fatigue load reduction of bldae

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...
by Cheng.Zhang
Tue Oct 29, 2019 7:01 am
Forum: Controls
Topic: Fatigue load reduction of bldae
Replies: 7
Views: 337

Fatigue load reduction of bldae

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...
by Cheng.Zhang
Thu Sep 26, 2019 3:12 am
Forum: Structural Analysis
Topic: load of mooring line
Replies: 2
Views: 343

Re: load of mooring line

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... :oops:

Best regards,
Cheng
by Cheng.Zhang
Wed Sep 25, 2019 10:44 am
Forum: Structural Analysis
Topic: load of mooring line
Replies: 2
Views: 343

load of mooring line

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
by Cheng.Zhang
Fri Jun 28, 2019 2:04 am
Forum: Controls
Topic: DTU 10MW Turbine
Replies: 1
Views: 868

Re: DTU 10MW Turbine

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...
by Cheng.Zhang
Wed Jun 26, 2019 8:13 am
Forum: Controls
Topic: questions about reference control input
Replies: 61
Views: 15011

Re: questions about reference control input

Dear Dr. Jason,

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

Best regards,
Cheng
by Cheng.Zhang
Wed Jun 26, 2019 1:42 am
Forum: Controls
Topic: questions about reference control input
Replies: 61
Views: 15011

Re: questions about reference control input

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 ...
by Cheng.Zhang
Tue Jun 25, 2019 3:35 am
Forum: Controls
Topic: questions about reference control input
Replies: 61
Views: 15011

Re: questions about reference control input

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...
by Cheng.Zhang
Thu Mar 14, 2019 9:16 am
Forum: Controls
Topic: Pitch and Torque Cntrl (Region 3)
Replies: 26
Views: 5295

Re: Pitch and Torque Cntrl (Region 3)

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
by Cheng.Zhang
Thu Mar 14, 2019 6:33 am
Forum: Controls
Topic: Pitch and Torque Cntrl (Region 3)
Replies: 26
Views: 5295

Re: Pitch and Torque Cntrl (Region 3)

Dear Jason,

Thank you!
Now, it is clear to me.

Best regards,
Cheng
by Cheng.Zhang
Thu Mar 14, 2019 4:48 am
Forum: Controls
Topic: Pitch and Torque Cntrl (Region 3)
Replies: 26
Views: 5295

Re: Pitch and Torque Cntrl (Region 3)

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 ...

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