Search found 15 matches

by Zhe.Zhang
Sat Oct 26, 2019 8:36 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 48
Views: 7745

Re: Linearization issue using Fast V7.02

Dear Jason,
I want to verify the linear model. The same wind velocity is input to the linear model as in FAST nonlinear simulations. The mean wind velocity is 16 m/s and the turbulence intensity is about 0.0564,How to set up the disturbance in simulink?
by Zhe.Zhang
Thu Oct 24, 2019 8:08 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 48
Views: 7745

Re: Linearization issue using Fast V7.02

Dear Jason, Before the azimuth averaging of the matrix, I have used MBC and obtained six matrices of MBC_AvgA, MBC_AvgB, MBC_AvgBd, MBC_AvgC, MBC_AvgD, and MBC_AvgDd.But I don't understand the elimination of the first column of matrix MBC_AvgA and the first column of MBC_AvgC, Do I need to close a d...
by Zhe.Zhang
Thu Oct 24, 2019 4:59 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 48
Views: 7745

Re: Linearization issue using Fast V7.02

Dear Jason,
I use the GetMats command to obtain the six matrices of AvgAMat, AvgBMat, AvgBdMat, AvgCMat, AvgDMat, and AvgDdMat as the coefficient matrix of the state space model. The mbc3 command can only get the MBC_AvgA matrix. Should I modify the mbc3 file?
Best regards,
by Zhe.Zhang
Wed Oct 23, 2019 9:29 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 48
Views: 7745

Re: Linearization issue using Fast V7.02

NRELOffshrBsline5MW_Floating_TLP.lin.docx Dear Jason, According to your suggestion, I added controller and disturbance input to the state space model, but the simulation results are very different from what I expected. I suspect that my FAST linearization is wrong. Can you help me? QQ截图201910241126...
by Zhe.Zhang
Wed Oct 23, 2019 6:35 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 48
Views: 7745

Re: Linearization issue using Fast V7.02

Dear Jason,
I know that the dimensions of these state vectors are set according to the DOF in FAST, but how are the initial values of these states determined, they represent the deviation from the set point, so are they all 0?
Best regards,
by Zhe.Zhang
Wed Oct 23, 2019 6:04 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 48
Views: 7745

Re: Linearization issue using Fast V7.02

Dear Jason,
Thanks for your timely reply.Are the initial values for these states all zero?
by Zhe.Zhang
Wed Oct 23, 2019 2:06 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 48
Views: 7745

Re: Linearization issue using Fast V7.02

Dear Jason, I intend to linearise the NREL 5MW turbine model in region 3 of operation. About the linearization of the file I put the annex.I have used MAC software to calculate the matrix of the state space model and build the model in simulink.But I don't know how to determine the value of input an...
by Zhe.Zhang
Mon Oct 21, 2019 8:24 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Does linearization provides wave disturbance matrix in the latest FAST?
Replies: 10
Views: 1099

Re: Does linearization provides wave disturbance matrix in the latest FAST?

Dear Dr. Jonkman,
I used FAST7 to linearize the TLP-type floating wind turbine, but the generator torque is always 0 during the linearization process. Is this normal?
by Zhe.Zhang
Fri Oct 18, 2019 1:32 am
Forum: Controls
Topic: FAST8 Linearization
Replies: 97
Views: 26508

Re: FAST8 Linearization

Dear Jason,
I have used FAST and MBC3 to calculate the coefficient matrix of the state space equation. My matlab foundation is relatively poor, so I would like to ask how to build this model using matlab. Can you provide a code example?
Best regards,
by Zhe.Zhang
Tue Oct 15, 2019 7:35 am
Forum: Computer-Aided Engineering Software Tools
Topic: Does linearization provides wave disturbance matrix in the latest FAST?
Replies: 10
Views: 1099

Re: Does linearization provides wave disturbance matrix in the latest FAST?

Dear Dr. Jonkman,
Thank you very much for your quick response.Do you mean that I want to achieve linearization of floating wind turbines only with FAST 7?
Thank you.
by Zhe.Zhang
Tue Oct 15, 2019 5:08 am
Forum: Computer-Aided Engineering Software Tools
Topic: Does linearization provides wave disturbance matrix in the latest FAST?
Replies: 10
Views: 1099

Re: Does linearization provides wave disturbance matrix in the latest FAST?

Dear Dr. Jonkman,
I want to use the openfast2.0 to realize the TLP type of floating wind turbine linearization, can you give me some information, because I still don't understand the logic of linearization.
Thank you.
by Zhe.Zhang
Thu Aug 29, 2019 7:18 pm
Forum: Computer-Aided Engineering Software Tools
Topic: problem in uniform wind file
Replies: 9
Views: 1375

Re: problem in uniform wind file

Dear Jason.Jonkman
I change the wind direction in two ways. Please help me to confirm whether the effect of the two methods is the same.
Thank you very much in advance.
1.docx
(101.16 KiB) Downloaded 12 times
by Zhe.Zhang
Thu Aug 29, 2019 4:25 am
Forum: Computer-Aided Engineering Software Tools
Topic: problem in uniform wind file
Replies: 9
Views: 1375

Re: problem in uniform wind file

Dear Jason.Jonkman
You provide two ways to change the wind direction.Change input parameters PropagationDir or set it in the uniform wind file,Are the results of the two methods consistent?
by Zhe.Zhang
Wed Aug 07, 2019 8:25 pm
Forum: Computer-Aided Engineering Software Tools
Topic: problem in uniform wind file
Replies: 9
Views: 1375

Re: problem in uniform wind file

Dear Jason.Jonkman
I have set the parameter in the inflowwind input file,but I still have an error, I don’t know why.Please do help me to sort this out.
Doc1.docx
(183.74 KiB) Downloaded 23 times
by Zhe.Zhang
Sat Aug 03, 2019 9:18 pm
Forum: Computer-Aided Engineering Software Tools
Topic: problem in uniform wind file
Replies: 9
Views: 1375

Re: problem in uniform wind file

hello!
I want to change the direction of the UniformWind type wind with matlab, what should I do?
Thank you very much in advance.

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