Search found 8 matches

by Zhongyou.Wu
Fri Dec 30, 2016 7:51 am
Forum: Computer-Aided Engineering Software Tools
Topic: SOWFA Support
Replies: 51
Views: 42078

Error: cannot find -lfast during installation

Hello everyone, I am trying to install OpenFOAM 2.0.1 on Ubuntu 14.04.5. I think I am almost done but came across this error: /usr/bin/ld: cannot find -lfast collect2: error: ld returned 1 exit status I guessed the error was due to a missing libfast.so. I searched all the source files and online but...
by Zhongyou.Wu
Sat Sep 03, 2016 6:12 pm
Forum: Computer-Aided Engineering Software Tools
Topic: help for remexing FAST S-function
Replies: 3
Views: 1015

Re: help for remexing FAST S-function

Hi Bonnie, Thanks to your suggestion, I finally mexed the FAST S-function after another day's try. For other guys information, I share the solution to my problem. As you pointed out, the mexing failed on the link stage. The reason for this failure is the error with the path, include, and lib variabl...
by Zhongyou.Wu
Sun Aug 28, 2016 9:30 pm
Forum: Computer-Aided Engineering Software Tools
Topic: help for remexing FAST S-function
Replies: 3
Views: 1015

Re: help for remexing FAST S-function

The error message from matlab:
matlab error message.JPG
matlab error message.JPG (75.13 KiB) Viewed 1013 times


FYI, I have successfully compiled and got FAST.exe on my computer, which works quite well.

Could you help me point out any errors on my work? Any suggestion is greatly appreciated. Thank you so much.

Zhongyou.Wu
by Zhongyou.Wu
Sun Aug 28, 2016 9:18 pm
Forum: Computer-Aided Engineering Software Tools
Topic: help for remexing FAST S-function
Replies: 3
Views: 1015

help for remexing FAST S-function

Dear Bonnie, Let me illustrate my problem briefly. Since I plan to introduce extra control variables into FAST, I need to remex FAST S-function to test the controller and run the simulation. Unfortunately, I got a huge trouble on that, which puzzled me for more than two weeks. I have searched and re...
by Zhongyou.Wu
Thu Jul 07, 2016 12:29 pm
Forum: Controls
Topic: FAST linearization model in Simulink
Replies: 14
Views: 4738

Re: FAST linearization model in Simulink

Hello Dr. Jonkman,

Thank you for your quick reply and helpful suggestion. I will do more simulations to look into the reason for this phenomenon later.

Sincerely,
Zhongyou.Wu
by Zhongyou.Wu
Thu Jul 07, 2016 10:14 am
Forum: Controls
Topic: FAST linearization model in Simulink
Replies: 14
Views: 4738

Re: FAST linearization model in Simulink

Hello Dr. Jonkman, Your reply helped me realize my mistake. Thank you so much. You are totally right. The input to my linearized model should be small deviations (delta u and delta w) around the operating point. It is also true for the output. When I add the output (delta y) to the steady point, the...
by Zhongyou.Wu
Thu Jun 30, 2016 4:29 pm
Forum: Controls
Topic: FAST linearization model in Simulink
Replies: 14
Views: 4738

Re: FAST linearization model in Simulink

Hi Bonnie, Thank you very much for your quick reply. I can now attach my simulation result. By the way, I also have tried the state space model in Simulink using the linearized result by FAST. The output is consistent with the second order output result. Both of them failed to match the FAST output.
by Zhongyou.Wu
Thu Jun 30, 2016 10:59 am
Forum: Controls
Topic: FAST linearization model in Simulink
Replies: 14
Views: 4738

FAST linearization model in Simulink

Hi everyone, I am now doing some work on model based offshore wind turbine control. To get an accurate mathematic model, I linearized the the NREL 5 MW wind turbine with Tension leg platform with 10 m/s constant wind velocity in still water. To check the linearized result, I built a model in simulin...

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