Search found 9 matches

by Yiqing.Xia
Mon May 05, 2014 6:20 pm
Forum: Rotor Aerodynamics
Topic: NREL5MW Rotor Speed Data
Replies: 7
Views: 6444

Re: NREL5MW Rotor Speed Data

Dear Marshall
Thank you very much for the reply.
by Yiqing.Xia
Mon May 05, 2014 6:41 am
Forum: Rotor Aerodynamics
Topic: NREL5MW Rotor Speed Data
Replies: 7
Views: 6444

Re: NREL5MW Rotor Speed Data

Dear I'm sorry. I have a question about the RotSpeed (Initial or fixed rotor speed (rpm)) in the inputfile XXX.fst of FAST. I don't understand why to set the Initial or fixed rotor speed. Because we have had the actual wind speed. Is there some impacts to the loads of wind turbine such as out-of-pla...
by Yiqing.Xia
Wed Mar 19, 2014 7:01 am
Forum: Computer-Aided Engineering Software Tools
Topic: AeroDyn and FAST
Replies: 8
Views: 3809

Re: AeroDyn and FAST

Dear Can I just change the water depth to 150m? Thank YOU. 200.0 WtrDpth - Water depth (meters) [USE THE SAME VALUE SPECIFIED IN THE WAMIT .POT FILE!] Dear Qiang, When IndModel is set to SWIRL, AeroDyn enables both axial and tangential induction. In the AeroDyn source code, variable Wake is a flag t...
by Yiqing.Xia
Tue Mar 04, 2014 8:32 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Beginner Guide for MATLAB Simulink and FAST
Replies: 47
Views: 50569

Re: Beginner Guide for MATLAB Simulink and FAST

Hi ,friends I read the paper <http://www.nrel.gov/docs/fy08osti/42437.pdf>. And in regin 2,the generator torque control,it said that : Simulating this control, we use step winds to excite the FAST turbine model. These step winds cause the turbine operating point to begin in Region 2, pass through Re...
by Yiqing.Xia
Fri Nov 22, 2013 8:07 am
Forum: Airfoils
Topic: Airfoil prep questions
Replies: 5
Views: 23310

Re: Airfoil prep questions

Hello I don't have enough data to extrapolate to get the significant wave height or other data with a recurrence period of 20 yr. Now I set the mean wind speed to 22m/s. With FAST, I get 20 outputfiles based on 20 different random numbers. I want to extrapolate to get Tower Top Fore-Aft Displacement...
by Yiqing.Xia
Thu Nov 21, 2013 5:14 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization in FAST with unbalanced Rotor
Replies: 5
Views: 4763

Re: Linearization in FAST with unbalanced Rotor

Thank You. I download the model of “NRELOffshrBsline5MW_ITIBarge4”. And there is only one kind of Bldfile. -------------------------------------------------------------------------------- ---------------------- FAST INDIVIDUAL BLADE FILE ------------------------------ NREL 5.0 MW offshore baseline b...
by Yiqing.Xia
Thu Nov 21, 2013 2:38 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization in FAST with unbalanced Rotor
Replies: 5
Views: 4763

Re: Linearization in FAST with unbalanced Rotor

Hello To account for manufacturing variability, all simulations also included a mass imbalance in the rotor, which instigates a once-per-rev excitation of the system when the rotor is spinning. The rotor mass imbalance was achieved by making one blade 0.5% heavier and one blade 0.5% lighter than the...
by Yiqing.Xia
Mon Oct 28, 2013 2:40 am
Forum: Computer-Aided Engineering Software Tools
Topic: Instructions for Compiling FAST
Replies: 257
Views: 142351

Re: Instructions for Compiling FAST

We frequently get asked questions about compiling FAST, so I have put together a set of instructions for compiling using Intel Visual Fortran (IVF) for Windows. You can access the pdf here: http://wind.nrel.gov/public/bjonkman/DesignCodes/FASTCompilingInstructions.pdf Please read this document care...
by Yiqing.Xia
Fri Apr 12, 2013 2:52 am
Forum: Computer-Aided Engineering Software Tools
Topic: MCrunch issue with Rainflow Cycle Exceedance plot
Replies: 7
Views: 6547

Re: MCrunch issue with Rainflow Cycle Exceedance plot

I still wonder What the TypeLMF is,how to select the value? Matt, TypeLMF is used to establish a 'fixed mean' for the fatigue channel. This fixed mean is used to adjust all the variable mean fatigue cycle ranges to ranges about a single fixed mean. Lrf = Lr * ( Lult - abs (Lmf) ) / ( Lult - abs(Lm) ...

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