Search found 27 matches

by Sean.Quallen
Mon Jun 15, 2015 4:03 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Question about WaveElev Output in FAST
Replies: 2
Views: 1735

Re: Question about WaveElev Output in FAST

Jason,

Thanks for verifying that!

Sean Quallen
by Sean.Quallen
Mon Jun 15, 2015 9:47 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about WaveElev Output in FAST
Replies: 2
Views: 1735

Question about WaveElev Output in FAST

Hello! I'm looking at the OC3 results (LC 5.1 with regular 6m waves) and I have a question about the WaveElev output. I can't seem to find this output in the manual anywhere so I'm asking on this forum. In the results it says, in the variable description, that WaveElev is "Wave Elevation at Pla...
by Sean.Quallen
Thu Jun 04, 2015 2:21 pm
Forum: Computer-Aided Engineering Software Tools
Topic: OC3 LC5.2 and 5.3 PSD Calculations
Replies: 4
Views: 2281

Re: OC3 LC5.2 and 5.3 PSD Calculations

Jason, I hope addressing you directly in this forum is acceptable. I found the issue with my PSD calculation and I'm now matching up reasonably. I do have one (hopefully final!) question about the NREL OC3 5.2/5.3 data. Did you resample this data to get the bins presented (0.005, 0.01, 0.015...)? Di...
by Sean.Quallen
Wed Jun 03, 2015 2:51 pm
Forum: Computer-Aided Engineering Software Tools
Topic: OC3 LC5.2 and 5.3 PSD Calculations
Replies: 4
Views: 2281

Re: OC3 LC5.2 and 5.3 PSD Calculations

Jason,

Thanks! I'm fairly certain my issue has to do with normalization inside the 'black-box' I'm using for my FFT as well. Much appreciated!

Sean Quallen
by Sean.Quallen
Wed Jun 03, 2015 1:53 pm
Forum: Computer-Aided Engineering Software Tools
Topic: OC3 LC5.2 and 5.3 PSD Calculations
Replies: 4
Views: 2281

OC3 LC5.2 and 5.3 PSD Calculations

Hello! I'm having issues matching up to the OC3 LC5.2 and 5.3 PSD calculations with my simulations (using another software package). My frequencies look good, but my magnitudes are 2-3 orders of magnitude higher than the results listed in the OC3 results while my time-series results actually show le...
by Sean.Quallen
Mon May 11, 2015 9:50 am
Forum: Computer-Aided Engineering Software Tools
Topic: Resistant moment of the rotor and of the electric generator
Replies: 9
Views: 10677

Re: Resistant moment of the rotor and of the electric genera

Thanks for the response Jason. Admittedly, I was verifying my work. :)
by Sean.Quallen
Sun May 10, 2015 10:27 am
Forum: Computer-Aided Engineering Software Tools
Topic: Resistant moment of the rotor and of the electric generator
Replies: 9
Views: 10677

Re: Resistant moment of the rotor and of the electric genera

To further this question, what if T_Aero is solved via the full drivetrain equation of motion from the "5MW Reference Tower Offshore Definition" paper?

T_Aero = I_Drivetrain*RotAccel + N_Gear*GenTrq

Is anything missing from this equation?
by Sean.Quallen
Sat May 02, 2015 10:35 am
Forum: Computer-Aided Engineering Software Tools
Topic: What's the exact meaning of HubIner?
Replies: 16
Views: 5241

Re: What's the exact meaning of HubIner?

Thank you Jason! For the OC3-Hywind, starting with my rotor inertia of 38759236 kg-m^2 and adding in the generator inertia of 5025500 kg-m^2, I get a drivetrain inertia about the LSS of 43,784,736 kg-m^2. Can anyone verify that number? I've been attempting to utilize the baseline variable-speed cont...
by Sean.Quallen
Fri May 01, 2015 5:31 pm
Forum: Computer-Aided Engineering Software Tools
Topic: What's the exact meaning of HubIner?
Replies: 16
Views: 5241

Re: What's the exact meaning of HubIner?

Sorry to dig up this old thread, but I have similar questions regarding the rotational inertia of the 5MW offshore spar-buoy (OC3) rotor. I'm trying to determine the inertia about the LSS so I'm starting with the "Rotor Inertia" from my .fsm file (38759236 kg-m^2). I see that this is 'at t...
by Sean.Quallen
Mon Apr 27, 2015 2:27 pm
Forum: Controls
Topic: Generator Torque in OC3 Phase IV Results
Replies: 2
Views: 2978

Re: Generator Torque in OC3 Phase IV Results

Jason,

Thanks! All these years and I never noticed that section at the end of the floating platform document.

Sean Q
by Sean.Quallen
Mon Apr 27, 2015 1:18 pm
Forum: Controls
Topic: Generator Torque in OC3 Phase IV Results
Replies: 2
Views: 2978

Generator Torque in OC3 Phase IV Results

Hello! I'm looking at NREL's OC3-PhaseIV results and I have a question about the generator torque in simulations 5.2 and 5.3. The VS-controller developed in the offshore reference turbine document (NREL/TP-500-38060) allows for a maximum gen-torque of 10% above rated (47.4 kN-m). However the OC3 res...
by Sean.Quallen
Mon May 05, 2014 10:08 am
Forum: Rotor Aerodynamics
Topic: Question about NREL Phase VI Power Data
Replies: 11
Views: 8327

Re: Question about NREL Phase VI Power Data

Marshall, Sorry about the delayed response. Thanks for all the help. I'm now looking into doing some verification studies regarding this and was wondering if sequence S had ever been run in FAST and, if so, where the results of that simulation were published. Or, in the interest of running it myself...
by Sean.Quallen
Sat Mar 29, 2014 9:52 am
Forum: Controls
Topic: OC3 Phase IV - LC 5.1 Controller Question
Replies: 4
Views: 2914

Re: OC3 Phase IV - LC 5.1 Controller Question

Jason,

As always, thanks!

Sean Quallen
by Sean.Quallen
Fri Mar 28, 2014 1:57 pm
Forum: Controls
Topic: OC3 Phase IV - LC 5.1 Controller Question
Replies: 4
Views: 2914

OC3 Phase IV - LC 5.1 Controller Question

Hello all! I'm probably misreading something here, so I'll ask before beating my head against the wall. In LC 5.1 of Phase IV of the OC3 the NREL-FAST simulation results present the pitch of blade 1 (BldPitch1) as a constant 0 degrees. Is that correct? Wasn't the blade pitch controller turned on for...
by Sean.Quallen
Tue Mar 25, 2014 10:11 am
Forum: Rotor Aerodynamics
Topic: Question about NREL Phase VI Power Data
Replies: 11
Views: 8327

Re: Question about NREL Phase VI Power Data

Sorry to bump my post, but has anyone had a chance to look at this? After acquiring more of the sequence S data I find that this absence of the 2P exists in all of the 5, 10, and 15 m/s sequences.

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