Search found 21 matches

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: 43

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: 43

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: 5129

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: 5129

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: 669

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: 669

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: 669

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: 598

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: 598

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 592 times

Debug.JPG
Debug.JPG (228.36 KiB) Viewed 587 times
by Mohamed.Fekry
Mon Jun 17, 2019 12:03 am
Forum: Computer-Aided Engineering Software Tools
Topic: Access violation reading location
Replies: 3
Views: 598

Access violation reading location

I tried to add some parameters in the ElastoDyn_Registry.txt. However, after building the code and starting the exe file, it crashed at different lines in ModMesh.f90. In contrary, the code runs normally if i comment the lines containing that parameters in ElastoDyn_Registry.txt. 1.png 2.png Reg.png
by Mohamed.Fekry
Sun Jun 09, 2019 2:09 am
Forum: Computer-Aided Engineering Software Tools
Topic: Debugger problem "The breakpoint will not currently be hit. No symbols have been loaded for this document
Replies: 2
Views: 633

Debugger problem "The breakpoint will not currently be hit. No symbols have been loaded for this document

I am using VS 2017 for coding OpenFast. Every time i place a break point to compile the program, the program continue without stopping at that breakpoint. There is a message appears next to the breakpoint as follows "The breakpoint will not currently be hit. No symbols have been loaded for this...
by Mohamed.Fekry
Tue May 07, 2019 10:22 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Missing files in Gasmi Paper Examples
Replies: 7
Views: 981

Re: Missing files in Gasmi Paper Examples

Thank you for your valuable comments The executable file is now generated but I had to modify some files as follows: 1- Add the above mentioned code (in your previious reply) to DoubPrec.f90 and SingPrec.f90 files for library (v1.07.02a-mlb) 2- Change the INTENT for the variable u from IN to INOUT, ...
by Mohamed.Fekry
Mon May 06, 2019 9:09 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Missing files in Gasmi Paper Examples
Replies: 7
Views: 981

Re: Missing files in Gasmi Paper Examples

I am now using gfortran to compile both the registry files and library files (v1.07.02a-mlb). Now, I have the registry.exe and also the following registry files, object files and mod files https://i.ibb.co/sQd52cF/reg.jpg https://i.ibb.co/W6vhw72/obj.jpg https://i.ibb.co/6WjDcpJ/MOD.jpg The problem ...
by Mohamed.Fekry
Mon Apr 29, 2019 9:52 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Missing files in Gasmi Paper Examples
Replies: 7
Views: 981

Re: Missing files in Gasmi Paper Examples

I tried to execute these registry files alone with MSVS, but the problem still persist. the compiler generate an error as follow: "Error RC1110 could not open ..\..\..\MSVS_IconResources\NREL_Bug.rc" Also, I tried to execute FAST_Registry-master with the Gasmi Paper Examples code but the p...

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