Search found 27 matches

by Mohamed.Fekry
Sat Jun 27, 2020 1:23 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization Problem in OpenFast V2.3
Replies: 4
Views: 221

Re: Linearization Problem in OpenFast V2.3

Dear Dr Jason

Thank you for that clarification. It works well.
by Mohamed.Fekry
Fri Jun 26, 2020 5:35 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization Problem in OpenFast V2.3
Replies: 4
Views: 221

Re: Linearization Problem in OpenFast V2.3

Dear Dr Jason Thank you for your valuable comments. However, I have disabled most of the modules because Openfast was initiating errors when they are enabled with linearization. Regarding the OpenFAST-dev, I tried to run it without linearization functionality on several test cases, but it generates ...
by Mohamed.Fekry
Fri Jun 26, 2020 7:32 am
Forum: Computer-Aided Engineering Software Tools
Topic: Old Versions of FAST
Replies: 2
Views: 209

Re: Old Versions of FAST

Dear Dr Jason
Thank you for the prompt response
by Mohamed.Fekry
Fri Jun 26, 2020 6:08 am
Forum: Computer-Aided Engineering Software Tools
Topic: Old Versions of FAST
Replies: 2
Views: 209

Old Versions of FAST

I tried to google many times on FAST V8 or FAST V7, but i did not find them anymore. There are many resources and published papers on the web that had been written over the years based on these old versions, which would be helpful for young researchers to understand the basics if they try to recreat...
by Mohamed.Fekry
Fri Jun 26, 2020 5:57 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization Problem in OpenFast V2.3
Replies: 4
Views: 221

Linearization Problem in OpenFast V2.3

I want to linearize NREL 5MW, particularly 5MW_ITIBarge_DLL_WTurb_WavesIrr, with enabling only two DOF, PtfmPDOF and GenDOF, in order to design state feedback controller to regulate the generator speed using collective pitch control as a single input. This means the state A matrix should be 4x4 and ...
by Mohamed.Fekry
Tue Oct 22, 2019 10:48 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Interface Openfast in Simulink
Replies: 1
Views: 715

Interface Openfast in Simulink

Dear all I am trying to interface the OpenFAST with Matlab/Simulink as "FAST_SFunc.c". However, many errors have been arisen in Matlab command windows every time I run Create_FAST_SFunc.m (attached in Simulink.zip) error.JPG also, I tried to include some files in the matlab workng director...
by Mohamed.Fekry
Tue Oct 15, 2019 5:56 pm
Forum: Computer-Aided Engineering Software Tools
Topic: How to choose the perturbation values for linearization?
Replies: 3
Views: 665

Re: How to choose the perturbation values for linearization?

Dear Dr Jonkman

Thank you for your understanding
Just I noticed that perturbation values are so large while it should be a small deviation from the operating point. Also, it does not causes any problem with my system until now.

Best Regards
M.Fekry
by Mohamed.Fekry
Sun Oct 13, 2019 9:20 pm
Forum: Computer-Aided Engineering Software Tools
Topic: How to choose the perturbation values for linearization?
Replies: 3
Views: 665

How to choose the perturbation values for linearization?

Why the Linearization subroutines of FAST (ED_Init_Jacobian, ED_Init_Jacobian_x) assumes a predefined perturbation values (p%du and p%dx) to perform the linearization for the motion equations? Based on what one should choose these values? For du perturbations if (allocated(u%BladePtLoads)) then do k...
by Mohamed.Fekry
Mon Jul 08, 2019 10:36 pm
Forum: Computer-Aided Engineering Software Tools
Topic: What's the exact meaning of HubIner?
Replies: 16
Views: 6605

Re: What's the exact meaning of HubIner?

Dear Dr Jason

Thank you for clarification

Best regards
by Mohamed.Fekry
Mon Jul 08, 2019 3:43 am
Forum: Computer-Aided Engineering Software Tools
Topic: What's the exact meaning of HubIner?
Replies: 16
Views: 6605

Re: What's the exact meaning of HubIner?

Dear Dr Jason I need some clarification about the red part in the equation below: RotIner = HubIner + SUM(( SecondMom(K) + BldMass (K)* ( HubRad + BldCg(k) )^2 - BldCg(k)^2) *( CosPreC(K)**2 )), k = 1,2,3 ) According to the Parallel Axis Theorem, the red part of equation should represent the square ...
by Mohamed.Fekry
Sun Jun 30, 2019 8:23 pm
Forum: Structural Analysis
Topic: Rotor-Furl Coordinate System
Replies: 5
Views: 1974

Re: Rotor-Furl Coordinate System

Thank you for kind consideration and clarification. However, I mean that why the transformation between rotor furl frame {rf} and Yaw frame{d} was not like this {rf} = [TransMat] * {d} [TransMat] =[q_RFrl] * [RFrlTilt] * [RFrlSkew] Also, I agree with you partially, {d} and {rf} coordinate systems ar...
by Mohamed.Fekry
Sat Jun 29, 2019 4:18 am
Forum: Structural Analysis
Topic: Rotor-Furl Coordinate System
Replies: 5
Views: 1974

Re: Rotor-Furl Coordinate System

Thank you for your explanation. However, I have a question
Why it is necessary to use Similarity Transformations and express the [q_RFrl] rotational matrix in Yaw frame?
It seems that the rotations [RFrlSkew] and [RFrlTilt] are made with respect to current frame concept (not fixed frame concept).
by Mohamed.Fekry
Tue Jun 25, 2019 4:01 am
Forum: Structural Analysis
Topic: Rotor-Furl Coordinate System
Replies: 5
Views: 1974

Rotor-Furl Coordinate System

I have a question regarding the transformation matrix - How can I derivative the rotational matrix from Nacelle / Yaw Coordinate System (d1,d2,d3) to Rotor-Furl Coordinate System (rf1,rf2,rf3) ? Where is the origin location of Rotor-Furl Coordinate System (rf1,rf2,rf3)? Please provide me with the re...
by Mohamed.Fekry
Mon Jun 17, 2019 9:22 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Access violation reading location
Replies: 3
Views: 1127

Re: Access violation reading location

Thank you for consideration
it works
by Mohamed.Fekry
Mon Jun 17, 2019 1:35 am
Forum: Computer-Aided Engineering Software Tools
Topic: Access violation reading location
Replies: 3
Views: 1127

Re: Access violation reading location

(Cont'd)
This is a screenshot of the parameters that I want to add
Reg.png
Reg.png (2.03 MiB) Viewed 1121 times

Debug.JPG
Debug.JPG (228.36 KiB) Viewed 1116 times

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