Search found 30 matches

by Rannam.Chaaban
Thu Jul 16, 2015 3:03 am
Forum: Computer-Aided Engineering Software Tools
Topic: Rotor interia once again!
Replies: 2
Views: 1975

Re: Rotor interia once again!

Thank you Jason :)
by Rannam.Chaaban
Fri Jul 10, 2015 4:43 am
Forum: Computer-Aided Engineering Software Tools
Topic: Rotor interia once again!
Replies: 2
Views: 1975

Rotor interia once again!

Dear All, I've a question about the rotor inertia (e.g. for the 5MW wind turbine), which is supposed to be variable depending on the blade pitch angle and the blade flapwise and edgewise motion. However, when I do linearize a simple model where only the GenDOF, DrTrDOF are enabled at different opera...
by Rannam.Chaaban
Fri Oct 11, 2013 1:44 am
Forum: Rotor Aerodynamics
Topic: NREL 5-MW reference turbine - CP, CQ, CT Coefficients
Replies: 35
Views: 77665

Re: NREL 5-MW reference turbine - CP, CQ, CT Coefficients

Dear Carolos,

It would be nice of you to provide me with your email, as I can't find a way to answer your email sent through this forum.

Best regards
Rannam
by Rannam.Chaaban
Wed Jun 05, 2013 1:36 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization of 5MW with Individual Pitch angles
Replies: 13
Views: 3217

Re: Linearization of 5MW with Individual Pitch angles

Dear Jason, The used FAST executable with frozen wake is the one you have mentioned. As the frozen wake assumption does not affect the result, I assume that your first suggestion about the asymmetry in stiffness matrix is still due to Aerodynamic stiffness. Thank you very much for your help. Kind re...
by Rannam.Chaaban
Tue Jun 04, 2013 10:13 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization of 5MW with Individual Pitch angles
Replies: 13
Views: 3217

Re: Linearization of 5MW with Individual Pitch angles

Dear Jason, Following are the errors I get when I try to linearize with frozen wake assumption, and Barge platform. Running FAST (v6.01, 12-Aug-2005). NREL 5.0 MW Baseline Wind Turbine for Use in Offshore Analysis. Heading of the aerodyn.ipt file : NREL 5.0 MW offshore baseline aerodynamic input pro...
by Rannam.Chaaban
Tue Jun 04, 2013 3:51 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization of 5MW with Individual Pitch angles
Replies: 13
Views: 3217

Re: Linearization of 5MW with Individual Pitch angles

Dear Jason, Here are the result I've obtained using the frozen talk assumption. Running the frozen wake enabled FAST and AeroDyn to get linearized model of the floating turbine did not converge after 9999 seconds. So I was not able to get the linearized model of floating turbine. Instead I've remove...
by Rannam.Chaaban
Mon Jun 03, 2013 2:03 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization of 5MW with Individual Pitch angles
Replies: 13
Views: 3217

Re: Linearization of 5MW with Individual Pitch angles

Dear Jason, The stiffness matrix reported in my post is the azimuth average one, the following figure shows the change of the stiffness matrix with the azimuth angle StffMat.jpeg The change in elements K>(1,2) and K(2,2) is around zero, so averaging will give small values. However, this does not app...
by Rannam.Chaaban
Fri May 31, 2013 9:37 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization of 5MW with Individual Pitch angles
Replies: 13
Views: 3217

Re: Linearization of 5MW with Individual Pitch angles

Dear Jason, I've another question, which needs your help to clear it out. I'm trying to build a simple linearized model for a floating wind turbine with the following specifications: 1- Enabled DOF: Platform pitch tilt rotation DOF PtfmPDOF = true, and GenDOF = true. 2- Enabled Control Inputs: Gener...
by Rannam.Chaaban
Thu May 02, 2013 7:20 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization of 5MW with Individual Pitch angles
Replies: 13
Views: 3217

Re: Linearization of 5MW with Individual Pitch angles

Thanks Jason,
Your note helped me a lot, I totally forgot about the shaft tilt :)

By the way, I'm having some problems in accessing wind.nrel.gov today, I always get "The specified URL cannot be found".
I hope the problem will be solved soon.

Thanks again and best regards.
by Rannam.Chaaban
Thu Apr 25, 2013 4:30 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization of 5MW with Individual Pitch angles
Replies: 13
Views: 3217

Linearization of 5MW with Individual Pitch angles

Dear all, I've a question regarding some linearization results I've got, which I couldn't understand. So I guess your help is needed :) I'm trying to linearized the 5MW standard wind turbine with the following features: Enabled DOF: GenDOF Enabled Control Inputs: individual pitch of blade 1,2,3 Also...
by Rannam.Chaaban
Tue Sep 18, 2012 7:28 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization - Disturbance
Replies: 3
Views: 2952

Re: Linearization - Disturbance

Hallo, As there was no answer for this post for sometime, I'll rephrase my question: What is the difference between the "5-Vertical power law wind shear" and "6- Linear vertical wind shear" in the linearized state space equation, and how can we interpret these disturbance inputs....
by Rannam.Chaaban
Tue Sep 04, 2012 3:25 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization - Disturbance
Replies: 3
Views: 2952

Linearization - Disturbance

Hallo, I’ve a question regarding the linearized wind turbine Model using FAST. The output state space equation of the linearized system is given as X' = A.X+B.U+Bd.W Y=C.X+D.U+Dd.W And what I’m trying to do is the use the Disturbance accommodating control method to compensate the vertical wind shear...
by Rannam.Chaaban
Fri Apr 27, 2012 7:38 am
Forum: Computer-Aided Engineering Software Tools
Topic: Learizing Baseline 5MW Wind Turbine with FAST
Replies: 81
Views: 23501

Learizing Baseline 5MW Wind Turbine with FAST

Hallo, I've a question regarding getting a linearized model of the 5MW wind turbine. I want to get a linearized model of the wind turbine in Region 3. and I've used the 5MW baseline wind turbine model, with the settings as indicated in FAST user manual. here is a summary of these settings AnalMode =...
by Rannam.Chaaban
Thu Mar 15, 2012 7:44 am
Forum: Rotor Aerodynamics
Topic: NREL 5-MW reference turbine - CP, CQ, CT Coefficients
Replies: 35
Views: 77665

Re: NREL 5-MW reference turbine - CP, CQ, CT Coefficients

Dear Jason, I've already implemented successfully the mentioned sophisticated controller for the Baseline 5MW turbine. However, I mention this simple controller as I've made a mistake in my first tries to run FAST. I've set the VSContrl = 1 expecting it will work fine, but that was not the case. Any...
by Rannam.Chaaban
Thu Mar 15, 2012 2:40 am
Forum: Rotor Aerodynamics
Topic: NREL 5-MW reference turbine - CP, CQ, CT Coefficients
Replies: 35
Views: 77665

Re: NREL 5-MW reference turbine - CP, CQ, CT Coefficients

Dear Jason, I've used the same DOF you mentioned in your excel file. which means: All DOFs enabled except GenDOF and DrTrDOF (of course TeetDOF = False). Regarding the wake, I've used the same setting provided by the baseline 5MW files, which means: InfModel = EQUIL & IndModel = SWIRL. Here are ...

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