Search found 38 matches

by Joannes.Olondriz
Tue Oct 02, 2018 10:05 am
Forum: Controls
Topic: Closed loop eigenvalues
Replies: 8
Views: 6684

Re: Closed loop eigenvalues

Dear everyone, I am trying to identify the closed-loop poles and zeros of the platform-pitch mode to analyze the negative platform damping effect in three floating platforms (barge, spar, and TLP) with the 5MW wind turbine. I did it with the barge and TLP platform after linearizing with FAST 7 witho...
by Joannes.Olondriz
Wed May 16, 2018 3:45 am
Forum: Computer-Aided Engineering Software Tools
Topic: Gain Scheduling
Replies: 25
Views: 9365

Re: Gain Scheduling

Dear Jason, I would like to do the sensitivity analaysis of aerodynamic power to blade pitch in region 3 with another wind turbine. That is why firstly I tryed to reproduce your test with the NREL 5MW. I got the same results as those of Ville ( https://wind.nrel.gov/forum/wind/viewtopic.php?f=4&...
by Joannes.Olondriz
Tue Apr 17, 2018 9:38 am
Forum: Computer-Aided Engineering Software Tools
Topic: FAST v8 FOWT model linearization with FAST v7
Replies: 3
Views: 741

Re: FAST v8 FOWT model linearization with FAST v7

Dear Jason, Thanks for your kind reply. Before developing the conversion script, I started doing it manually. I have done the conversion of AeroDyn, Blade and .fst files. But I found dificulties in platform file to know how it is achieved the effective diameter (PtfmDiam) and the meaning of the para...
by Joannes.Olondriz
Thu Apr 12, 2018 2:37 am
Forum: Computer-Aided Engineering Software Tools
Topic: FAST v8 FOWT model linearization with FAST v7
Replies: 3
Views: 741

FAST v8 FOWT model linearization with FAST v7

Dear all, I would like to linearize a floating wind turbine model, but the files are in FAST v8 format. Thus, I was wondering if there is any matlab function to convert FAST v8 files into FAST v7 format. Or if someone did this conversion before. Any suggestion is also welcome. Thanks in advance, Joa...
by Joannes.Olondriz
Mon Oct 23, 2017 9:49 am
Forum: Computer-Aided Engineering Software Tools
Topic: WAMIT .ss file
Replies: 10
Views: 1549

Re: WAMIT .ss file

Dear Jason, This is the error displayed: Error using Run_Simu (line 21) Error reported by S-function 'FAST_SFunc' in 'FOWT_Simulink_Jonkman_detuned/FAST Nonlinear FOWT 5MW NREL/S-Function': FAST_InitializeAll:SrvD_Init:ValidatePrimaryData:Yaw angle and rate are not commanded from Simulink model. Val...
by Joannes.Olondriz
Mon Oct 23, 2017 7:16 am
Forum: Computer-Aided Engineering Software Tools
Topic: WAMIT .ss file
Replies: 10
Views: 1549

Re: WAMIT .ss file

Dear Jonkman,

Ok, thank you.

I can not run the simulation in FAST/HydroDyn with the convolution method (RdtnMod = 1). Error displayed says that it is not allowed with the current version of HydroDyn. I used the version 2.03.

Did you sent to Tiago the files attached by me?

Thank you again,
JOE
by Joannes.Olondriz
Mon Oct 23, 2017 1:22 am
Forum: Computer-Aided Engineering Software Tools
Topic: WAMIT .ss file
Replies: 10
Views: 1549

Re: WAMIT .ss file

Dear Jonkman, Thanks for your quick reply. Yes, I followed the guidance. I try with fourth identification methods and the one that fits best was Frequency Domain Identification (FDI) with Fit Accuracy of 0.97. But the results are not very accurate as previously attached results shows. If I introduce...
by Joannes.Olondriz
Fri Oct 20, 2017 4:25 am
Forum: Computer-Aided Engineering Software Tools
Topic: WAMIT .ss file
Replies: 10
Views: 1549

Re: WAMIT .ss file

Dear Jonkman, I return to the subject of *.ss files. I execute 'ss_fitting.m' to my hydrodynamic and hydrostatic results (*.1, *.3 and .hst). But the obtained *.ss file is not good enough. I analyzed the resulting plots and are very different to original ones. There are some oscillations where there...
by Joannes.Olondriz
Wed May 10, 2017 6:32 am
Forum: Computer-Aided Engineering Software Tools
Topic: Instructions for Compiling FAST
Replies: 200
Views: 111627

Re: Instructions for Compiling FAST

Dear all, I was compiling FAST as 'FASTCompilingIntructions' says but I get a error message, CMD_Error.png ERROR: Visual Studio 2015 is not found in the system. This error can be because the Visual Studio shortcut path is not right written? I do like this in 'Compile_FAST.bat': CALL "C:\Program...
by Joannes.Olondriz
Tue May 02, 2017 7:37 am
Forum: General
Topic: 5MW FOWT linearization issue
Replies: 43
Views: 13697

Re: 5MW FOWT linearization issue

Dear Jason,

Thanks for your instantaneous reply.

That was my thought. Ok, I will try it. I will tell you if I get it.

Best regards,
JOE
by Joannes.Olondriz
Tue May 02, 2017 6:53 am
Forum: General
Topic: 5MW FOWT linearization issue
Replies: 43
Views: 13697

Re: 5MW FOWT linearization issue

Dear Jason, Getting back to the previous topic, yes I did as FAST v7 User's Guide explains for linearization, TrimCase to 3, VSContrl to 1, VS_RtTq to the desired constant generator torque (43093.55Nm in this case), and VS_RtGnSp, VS_Rgn2K, and VS_SlPc to 9999.9E-9 (very small don't cares > 0.0). Bu...
by Joannes.Olondriz
Thu Apr 27, 2017 7:29 am
Forum: General
Topic: 5MW FOWT linearization issue
Replies: 43
Views: 13697

Re: 5MW FOWT linearization issue

Dear Jason, Thank you for your fast reply! I agree with you. But if I do with CalcStdy = True and TrimCase = 3 the generator torque also it varies and it should not, right? I mean, above rated wind speed as it is the case (13m/s) torque should be at rated value (43093.55Nm) for achieving nominal out...
by Joannes.Olondriz
Wed Apr 26, 2017 1:07 am
Forum: General
Topic: 5MW FOWT linearization issue
Replies: 43
Views: 13697

Re: 5MW FOWT linearization issue

Dear Jason, Ok, let's forget about the blurry bode. But according to the linearization output files I attached, is it logical to achieve the same rotor speed and same generator torque with different blade pitch angle at 13m/s constant wind speed? With TrimCase = 3 -> Blade pitch = 6.25º With initial...
by Joannes.Olondriz
Tue Apr 25, 2017 9:54 am
Forum: General
Topic: 5MW FOWT linearization issue
Replies: 43
Views: 13697

Re: 5MW FOWT linearization issue

Dear all, According to FAST User's Guide are two ways for linearize systems, with CalcStdy true or false right? I did it both ways, and the results it is the same. But when I was checking I realized that the result is not very accurate. For example, if I am doing the linearization in the operational...
by Joannes.Olondriz
Tue Mar 28, 2017 9:36 am
Forum: General
Topic: Output file issue
Replies: 2
Views: 2633

Re: Output file issue

Dear all again, I found it. Is due to the abrupt user interruption (Ctrl+C). I was trying to see first second response and instead of setting small simulation time, I was interrupting by myself. What I dont know is if FAST aborts the process, generates binary output file or not? Thank you so much in...

Go to advanced search