Search found 68 matches

by Xing.Wei
Tue Jan 28, 2020 5:14 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about NREL 5MW barge platform dynamics and Tower TMD
Replies: 1
Views: 944

Question about NREL 5MW barge platform dynamics and Tower TMD

Dear All I have a question about the interaction between the tower TMD and platform dynamics for NREL 5MW offshore barge wind turbine. I am wondering if the tower TMD (X and Y directions both enabled)motions will influence all the 6 platform DOFs (surge, sway, heave, yaw, pitch, roll) or only influe...
by Xing.Wei
Mon Mar 04, 2019 2:29 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Question about FAST-SC
Replies: 3
Views: 1510

Re: Question about FAST-SC

Dear Jason

Could you please kindly guide me to where I can input the external force in FAST 8. I checked the ServoDyn.dat and ServoDyn_TMD.dat but I could not find where to input the external force. I hope to input it from Simulink.

Best

XING WEI
by Xing.Wei
Mon Mar 04, 2019 10:37 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about FAST-SC
Replies: 3
Views: 1510

Question about FAST-SC

Dear All I have a very simple question about FAST-SC. I know maybe this is not the best place to ask the question about FAST-SC however I am in hurry to conduct the simulation and the question is very simple so maybe a lot of friends could answer it quickly. The question is about the external force ...
by Xing.Wei
Mon Jan 07, 2019 9:58 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about using TMD in nacelle
Replies: 18
Views: 2739

Re: Question about using TMD in nacelle

Dear Jason

You are correct! Sorry I did not realize this could be a problem.

Best

XING WEI
by Xing.Wei
Mon Jan 07, 2019 9:20 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about using TMD in nacelle
Replies: 18
Views: 2739

Question about using TMD in nacelle

Dear All I am using FAST 8 and encountered a problem with TMD in the nacelle. I was trying to use the nacelle TMD but there is always an error. So, I decided to do a very simple test by using the "test01.fst" provided by FAST 8 and enabling the use of nacelle TMD. I copied the file "N...
by Xing.Wei
Wed Nov 14, 2018 8:39 am
Forum: Computer-Aided Engineering Software Tools
Topic: About calculating the tower base load
Replies: 1
Views: 1233

About calculating the tower base load

Dear All I am simulating an offshore wind turbine using the FAST 8. I designed a controller to control the platform pitch angle. I am wondering what the values should I use to compare the performance of the controller. 1. I calculate the root-mean-square of the pitch angle with the 0 degree as the m...
by Xing.Wei
Thu Nov 01, 2018 12:39 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Question about FAST 7
Replies: 1
Views: 1310

Question about FAST 7

Dear all I am currently using FAST 7 to do some simulation. There is a place in "NRELOffshrBsline5MW_TMD_v710.fst" file to include the platform file which is shown below. I am wondering if this is the place where I can define the properties of the platform and also the properties of the wa...
by Xing.Wei
Thu Oct 18, 2018 3:48 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Question about wind turbine blades
Replies: 3
Views: 1764

Re: Question about wind turbine blades

Dear Jason Thank you for your quick reply. What I am thinking about is to add a TMD system on blades in another wind turbine model. It is easy to implement but I am not sure if it is reasonable. May I ask what does it mean by saying "Normally, the blade-flapwise mode is well damped by aerodynam...
by Xing.Wei
Thu Oct 18, 2018 10:10 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about wind turbine blades
Replies: 3
Views: 1764

Question about wind turbine blades

Dear All I am encountering a problem that if it is applicable to use a TMD system inside the wind turbine blades to sense the vibration of the blades? Here are the details. If I connect a TMD system to a node of the upper layer of the blades and place the whole system inside the wind turbine blades ...
by Xing.Wei
Fri Sep 07, 2018 7:33 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about the free vibration of offshore wind turbine tower
Replies: 1
Views: 1393

Question about the free vibration of offshore wind turbine tower

Dear All I have a question about the vibration of the wind turbine tower. I use Fast 8 and only enable Tower fore-aft displacement DOF and platform pitch DOF and enable the use of TTMD in X direction. I set the wind to be 0.001m/s and wave condition to be still water. The initial platform pitch angl...
by Xing.Wei
Thu Mar 15, 2018 9:54 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about running FAST 8 in Simulink
Replies: 25
Views: 6740

Re: Question about running FAST 8 in Simulink

Dear Jason Thank you for your kind reply! I have managed to do the coordinates transfer in Simulink and added two input ports for S-function. The two inputs added are the external forces to TTMD in x and y directions. 123.JPG The propose of blocks in Simulink is to calculate some loads including the...
by Xing.Wei
Tue Mar 13, 2018 9:28 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about running FAST 8 in Simulink
Replies: 25
Views: 6740

Re: Question about running FAST 8 in Simulink

Dear Jason Thank you for your kind reply! Well, the reason why I want to use "TwHtRDyt" is that I want to calculate the transfer matrix in Simulink so I guess I need to use some existing outputs. For the transfer matrix from global coordinates to the platform coordinate, I could utilize th...
by Xing.Wei
Tue Mar 13, 2018 7:43 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question about running FAST 8 in Simulink
Replies: 25
Views: 6740

Re: Question about running FAST 8 in Simulink

Dear Jason Thank you for your kind reply! I have studied the source code in SetCoordSy() and found the following things. The first picture shows how to obtain the coordinate system for tower local nodes t1,t2, t3 from the coordinate system a1, a2, a3 fixed on the tower base. The variable "Theta...
by Xing.Wei
Mon Mar 12, 2018 2:18 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Question about running FAST 8 in Simulink
Replies: 25
Views: 6740

Re: Question about running FAST 8 in Simulink

Dear Jason Thank you for your quick reply! I have studied the source code and found the following: In TMD module, the following picture showed the orientation matrix used to obtain the local coordinates for TTMD. 12345.JPG The second picture showed the way to get u%Mesh%Orientation(:,:,1) for TTMD: ...
by Xing.Wei
Mon Mar 12, 2018 12:21 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Question about running FAST 8 in Simulink
Replies: 25
Views: 6740

Re: Question about running FAST 8 in Simulink

Dear Jason Thank you for your kind reply! I have studied the TMD Module Theory Manual. I found that it was based on the TMD in the nacelle. Studying the source code gives me the same information. I believe that for the TTMD in tower base, the platform acts the same as the nacelle for NTMD. Am I righ...

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