Search found 45 matches

by Neelabh.Gupta
Fri Jan 19, 2018 7:48 am
Forum: Computer-Aided Engineering Software Tools
Topic: Changing Turbulence Intensity with EWM wind: TurbSim
Replies: 1
Views: 678

Changing Turbulence Intensity with EWM wind: TurbSim

Hello, I want to generate a EWM wind based on DIBt 2012 standard. This requires different turbulence intensity and wind shear parameters to those defined in IEC61400-1 ed. 3. The wind shear is 0.121 and turbulence intensity is 12 % (for my case). When I explicitly specify these parameters and run Tu...
by Neelabh.Gupta
Tue Sep 26, 2017 1:05 am
Forum: Computer-Aided Engineering Software Tools
Topic: Announcing MExtremes
Replies: 24
Views: 5202

Re: Announcing MExtremes

Sure, I agree. We will try to put forward this question to a certification body and see what they have to say on this.

Will keep posted.

Thanks,
Neelabh
by Neelabh.Gupta
Mon Sep 25, 2017 3:09 am
Forum: Computer-Aided Engineering Software Tools
Topic: Announcing MExtremes
Replies: 24
Views: 5202

Re: Announcing MExtremes

Hi Jason, We seem to have found the reason of the difference. A colleague of mine checked the FAST and Bladed simulations and he found Bladed gives/tabulates the ultimate loads that is "closest to averaged maximum " while FAST gives/tabulates the value that is " closest and higher tha...
by Neelabh.Gupta
Tue Sep 19, 2017 2:14 am
Forum: Computer-Aided Engineering Software Tools
Topic: Announcing MExtremes
Replies: 24
Views: 5202

Re: Announcing MExtremes

Hello Jason, Yes indeed, changing the bin arrangement such that the centers are at simulated runs, helped. But still, there is some difference I found in averaged extreme value (calculated) between MExtremes and Bladed. So, for example, MExtremes calculated the averaged extreme value as 109.9 kNm an...
by Neelabh.Gupta
Fri Sep 15, 2017 1:25 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Announcing MExtremes
Replies: 24
Views: 5202

Re: Announcing MExtremes

Hello again guys, Thanks for answering previous queries. Those did help. Currently I am using using MExtremes for post-processing loads based in IEC 61400-1 ed3. I have a very specific query here: I have run ETM (DLC1.3) with 11 wind speeds, 6 seeds and 3 yaw misalignment. So total of 198 cases. I g...
by Neelabh.Gupta
Wed Aug 23, 2017 5:00 am
Forum: Computer-Aided Engineering Software Tools
Topic: Announcing MExtremes
Replies: 24
Views: 5202

Re: Announcing MExtremes

Hello Greg, I have another question regarding "Input Files" tab in MExtremes. Is there a way to specify all the input files (i.e. output files from FAST) in one go here. The thing is, I want to do an ultimate analysis with few hundred load cases and its a bit cumbersome to generate this bi...
by Neelabh.Gupta
Tue Aug 15, 2017 2:17 am
Forum: Computer-Aided Engineering Software Tools
Topic: Announcing MExtremes
Replies: 24
Views: 5202

Re: Announcing MExtremes

Thanks Greg for your response. Replacing ~ with a dummy variable did help (I was on the right path, but then there were multiple replacements to be done; so I was not sure).

Now, MExtremes seem to run fine.

Cheers,
Neelabh
by Neelabh.Gupta
Mon Aug 14, 2017 3:52 am
Forum: Computer-Aided Engineering Software Tools
Topic: Announcing MExtremes
Replies: 24
Views: 5202

Re: Announcing MExtremes

Hello Marshall, I am trying to run MExtremes using MATLAB version 7.7 (7.7.0.471 R2008b, to be precise), but I am getting these 'unexpected bracket' error. MExtremes_err.PNG I thought '~' was causing it and I replaced it with 'ext'; so this error was gone. But then a similar error popped up for &quo...
by Neelabh.Gupta
Tue Aug 08, 2017 4:14 am
Forum: Structural Analysis
Topic: Loads extrapolation
Replies: 2
Views: 2866

Re: Loads extrapolation

Hello Everyone, I see this post has not been answered. I am curious if there are any NREL post-processing routines (or any other option) that can be used for FAST (ultimate) loads output and comply with IEC61400-1 ed.3. This would include: - Extrapolation of DLC 1.1 as Jacob mentioned - Determining ...
by Neelabh.Gupta
Fri Jul 21, 2017 2:59 am
Forum: Computer-Aided Engineering Software Tools
Topic: FAST: Tower Model
Replies: 28
Views: 9906

Re: FAST: Tower Model

Hello Guys,

I am using FASTv7 for an upwind turbine. I was just wondering, when aerodynamic loads on tower are not included; does that mean turbine will not see any 1p/3p because of tower shadow? (and hence, no potential flow model is used for tower shadow?)

Hope to hear from you.
Neelabh
by Neelabh.Gupta
Mon Jul 17, 2017 1:58 am
Forum: Computer-Aided Engineering Software Tools
Topic: Generator Short-circuit simulation: FAST
Replies: 5
Views: 1600

Re: Generator Short-circuit simulation: FAST

Hello Florian and Jason,

Thanks a lot for your response. Indeed it is a generator torque time series reflecting short-circuit.
Will take your suggestions into consideration.

Appreciate it.

Neelabh
by Neelabh.Gupta
Tue Jul 11, 2017 7:27 am
Forum: Computer-Aided Engineering Software Tools
Topic: Generator Short-circuit simulation: FAST
Replies: 5
Views: 1600

Generator Short-circuit simulation: FAST

Hello, Is there a way to simulate a generator short-circuit in FAST? I have a short-circuit time series. If this could not be used, is there any other way to simulate such an event? I looked into the FAST manual "Simulating Special Events", but could not find any specific information on th...
by Neelabh.Gupta
Mon Jul 08, 2013 9:23 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization in FAST with unbalanced Rotor
Replies: 5
Views: 4438

Linearization in FAST with unbalanced Rotor

Dear All, I performed linearization analysis using FAST (3-bladed NREL turbine with blade properties from 'UPWIND' project) for two scenarios: Scenario 1): No imbalance in 3 blades Scenario 2): 5%, 0 % and -5% Imbalance in Blades Attached is a excel sheet Campbell.xlsx for these two scenarios. I see...
by Neelabh.Gupta
Tue Jun 18, 2013 6:27 am
Forum: Computer-Aided Engineering Software Tools
Topic: Varied Pitch angles:Incorporating blade prod'n tolerance
Replies: 5
Views: 4188

Re: Varied Pitch angles:Incorporating blade prod'n tolerance

Dear Jason, Thanks a lot for your guidance. I did manage to compile a new DISCON.dll file with pitch offsets. But do I have to compile FAST again with updated BladedDLLInterface.f90 (for individual pitch control) and generate a new DLL for FAST (using all other source codes for FAST) or did you mean...
by Neelabh.Gupta
Thu Apr 25, 2013 8:14 am
Forum: Computer-Aided Engineering Software Tools
Topic: Varied Pitch angles:Incorporating blade prod'n tolerance
Replies: 5
Views: 4188

Re: Varied Pitch angles:Incorporating blade prod'n tolerance

Dear Jason, I read the previous post on this topic, but am not really sure which parameters to change in the PitchCntrl() Subroutine. I don't want to mess up the whole control logic. I have a Fortan file PitchCntrl_ACH.f90 which contains this routine, but I don't have sufficient knowledge here on wh...

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