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by Jason.Jonkman
Mon Dec 17, 2018 7:01 am
Forum: Computer-Aided Engineering Software Tools
Topic: Aerodyn v15 Unsteady Aerodynamics
Replies: 1
Views: 14

Re: Aerodyn v15 Unsteady Aerodynamics

Dear Barry, I'm not sure why AeroDyn is triggering an error related to "Mach number" for your case. Because you disabled all ElastoDyn DOFs, it sounds like you want to simulate with a rigid turbine. In that case, I would recommend that you use the standalone AeroDyn v15 driver rather than ...
by Jason.Jonkman
Sat Dec 15, 2018 9:45 am
Forum: Controls
Topic: N4 Overspeed,Na Overspeed and Normal stop
Replies: 1
Views: 58

Re: N4 Overspeed,Na Overspeed and Normal stop

Dear Kan.Zheng, I'm not familiar with the terms "N4 overspeed" or "Na overspeed", so, I'm not sure how to answer your question. (Perhaps someone else on this forum can respond.) While there are few built-in control options in the ServoDyn module of FAST/OpenFAST, most control fun...
by Jason.Jonkman
Fri Dec 14, 2018 9:12 am
Forum: Computer-Aided Engineering Software Tools
Topic: FAST theory manual
Replies: 169
Views: 16267

Re: FAST theory manual

Sent.
by Jason.Jonkman
Fri Dec 14, 2018 7:28 am
Forum: Computer-Aided Engineering Software Tools
Topic: Compiling options for DISCON.dll
Replies: 16
Views: 7153

Re: Compiling options for DISCON.dll

Dear Jason,

Compiling instructions for FAST RT are in a pdf document contained in the Labview directory of the FAST v7 archive (UsingFAST4Labview.pdf).

Best regards,
by Jason.Jonkman
Thu Dec 13, 2018 10:14 am
Forum: Structural Analysis
Topic: Tower Eigenfrequencies of NREL 5MW Turbine
Replies: 54
Views: 42984

Re: Tower Eigenfrequencies of NREL 5MW Turbine

Dear Zhou.Lin, The archives you attached appear to be corrupted, so, I can't review what you attached. But regarding the invalid numeric input error, as with any input file format problem, I suggest that you use the Echo option from the input file to debug errors in the input-file processing. I'm no...
by Jason.Jonkman
Wed Dec 12, 2018 6:32 am
Forum: Computer-Aided Engineering Software Tools
Topic: Excluding blade actuator model in ADAMS model
Replies: 3
Views: 1133

Re: Excluding blade actuator model in ADAMS model

Dear Chenen, I agree with your calculations. The difference in the pitch inertias between the two calculations is likely related to numerical round in some of the values. The pitch inertia I used in the original calculation of BPActrSpr and BPActrDmp for the NREL 5-MW baseline wind turbine was 27338...
by Jason.Jonkman
Wed Dec 12, 2018 6:23 am
Forum: Computer-Aided Engineering Software Tools
Topic: Instruction for the Seismic fast version
Replies: 17
Views: 869

Re: Instruction for the Seismic fast version

Dear Simon,

That would be great, but NREL has not yet had the funding to do that.

Best regards,
by Jason.Jonkman
Tue Dec 11, 2018 9:23 am
Forum: Computer-Aided Engineering Software Tools
Topic: OpenFAST development
Replies: 3
Views: 114

Re: OpenFAST development

Dear Yingyi.Liu, The existing implementation of the tower-influence and -shadow models in AeroDyn v15 assumes that the tower is cylindrical. This is one reason why we never implemented aerodynamic lift forces on the tower. I'm not aware of similar tower-influence and -shadow models that are applicab...
by Jason.Jonkman
Tue Dec 11, 2018 7:17 am
Forum: General
Topic: Error running MoorDyn
Replies: 5
Views: 127

Re: Error running MoorDyn

Dear Sai, I don't see anything obviously wrong with your HydroDyn file either. Comparing your input files to the OC3-Hywind spar model of Test24 from FAST v8.15, I see that you've only changed a few of the ElastoDyn and HydroDyn inputs, including increasing the water depth from 320 to 2000 m. (That ...
by Jason.Jonkman
Tue Dec 11, 2018 6:37 am
Forum: General
Topic: Error running MoorDyn
Replies: 5
Views: 127

Re: Error running MoorDyn

Dear Sai,

I don't see anything out of the ordinary with your ElastoDyn file. What does your HydroDyn file look like?

Best regards,
by Jason.Jonkman
Tue Dec 11, 2018 6:31 am
Forum: Controls
Topic: Pitch control error
Replies: 18
Views: 3486

Re: Pitch control error

OK, thanks for the advice!
by Jason.Jonkman
Mon Dec 10, 2018 4:50 pm
Forum: General
Topic: Error running MoorDyn
Replies: 5
Views: 127

Re: Error running MoorDyn

Dear Sai, This error doesn't seem to be related to MoorDyn, as the error is describing a singular matrix in the ElastoDyn-HydroDyn (ED-HD) coupling. I'd assume you get the same error if you use MAP++ or disable the mooring module altogether. Have you set the platform-yaw inertia to zero in ElastoDyn...
by Jason.Jonkman
Mon Dec 10, 2018 8:16 am
Forum: Controls
Topic: Pitch control error
Replies: 18
Views: 3486

Re: Pitch control error

Dear Barry, The rapidly varying blade-pitch angles you are seeing in your Simulink model are likely caused by the extrapolation of inputs implemented within the FAST S-Function (as discussed in other forum topics e.g. https://wind.nrel.gov/forum/wind/viewtopic.php?f=4&t=1985&p=10496 and http...
by Jason.Jonkman
Mon Dec 10, 2018 7:00 am
Forum: Computer-Aided Engineering Software Tools
Topic: What's the exact meaning of HubIner?
Replies: 9
Views: 3387

Re: What's the exact meaning of HubIner?

Dear Muddassir, I'm not sure why your hand calculation of the rotor blade inertia does not match the FAST v7 summary file, but your equation for the rotor inertia (RotIner) is not correct because you miss (1) the influence of the hub radius (HubRad) and (2) the influence of the rotor precone (PreCon...
by Jason.Jonkman
Fri Dec 07, 2018 11:16 am
Forum: Structural Analysis
Topic: Free-Vibration Response of OC3HYwind Spar turbine
Replies: 46
Views: 3533

Re: Free-Vibration Response of OC3HYwind Spar turbine

Dear Mitesh, I feel like I've already answered these questions. I wont solve your problem for you. Please realize that we can't offer unlimited support to free data and open-source software. Please be respectful of our time by trying to work through problems yourself before asking questions. Best re...

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