Search found 18 matches

by Yichau.Liu
Wed Mar 13, 2019 4:36 pm
Forum: Airfoils
Topic: Making fault
Replies: 22
Views: 7192

Re: Making fault

Dear Matt.Hall, Thank you for your help last time and I also hope to realize the same mooring line failure (fairlead and anchor failures) in the MoorDyn C, namely the C lib. that I downloaded on your website (http://www.matt-hall.ca/moordyn.html). It also would be connect to the MATLAB in my case. T...
by Yichau.Liu
Sat Feb 16, 2019 6:03 am
Forum: Airfoils
Topic: Making fault
Replies: 22
Views: 7192

Re: Making fault

Dear Jason, It's very kind of you. Thank you for helping check the results. In my case, the OWT starts to generate wind power only after 50s since the rotor speed and generator speed have a set-up process and increase from 0 at the beginning (0s) and reach rated value at around 50s. I think this is ...
by Yichau.Liu
Fri Feb 15, 2019 3:10 am
Forum: Airfoils
Topic: Making fault
Replies: 22
Views: 7192

Re: Making fault

Dear Jason, Thank you for your quick response. I use a DTU 10MW reference wind turbine and the floating foundation is SWE-TripleSpar Floating Platform (attached). It is in normal operating condition with constant wind speed (12m/s) without turbulence, irregular wave based on JONSWAP spectrum with he...
by Yichau.Liu
Thu Feb 14, 2019 4:22 pm
Forum: Airfoils
Topic: Making fault
Replies: 22
Views: 7192

Re: Making fault

Dear Jason, I am trying to add some band-limited white noises into the output signals (e.g. tower top acceleration y) to represent the measurement noise of tower top acceleration y sensor. The magnitude of the noise is determined according to the following literature (Table 1) which has been enclose...
by Yichau.Liu
Wed Dec 19, 2018 8:17 am
Forum: Airfoils
Topic: Making fault
Replies: 22
Views: 7192

Re: Making fault

Dear Matt.Hall, Thanks for your kind suggestions, which really help me a lot. I am sorry for not response to you so quickly, because I am working on the problem of the mooring line failure these days. Following your advice, I set the m%LineList(1)%FairConnect)%Ftot to be zero and set the m%LineList(...
by Yichau.Liu
Thu Dec 13, 2018 11:32 am
Forum: Airfoils
Topic: Making fault
Replies: 22
Views: 7192

Re: Making fault

Dear Jason, Many thanks to you for your kind help all the time. In addition to the blade failure, I also want to make the mooring line failure. I am considering two outmost failures now. One is a failure in the top segment (fairlead), which is close to the floating platform (hence the mooring line w...
by Yichau.Liu
Thu Nov 15, 2018 1:44 pm
Forum: Airfoils
Topic: Making fault
Replies: 22
Views: 7192

Re: Making fault

Dear Jason, With your help, I have added an additional dimension of the variable KBF, KBE and make it changed with time. I am trying to understand the infuence of the changed stiffness and mode shape. According to the ElastoDyn, the KBF and KBE are used to calculate the natural frequency of the blad...
by Yichau.Liu
Wed Oct 31, 2018 10:18 am
Forum: Airfoils
Topic: Making fault
Replies: 22
Views: 7192

Re: Making fault

Dear Jason, Thanks for your answers. I am still trying to understand the meaning of the source code in ElastoDyn.f90 and want to make the stiffness or/and mode shapes of the blades changing with time firstly. But now I still confused, I am not sure which part or which subroutine I should modify. Cou...
by Yichau.Liu
Tue Oct 23, 2018 12:03 pm
Forum: Airfoils
Topic: Making fault
Replies: 22
Views: 7192

Re: Making fault

Dear Jason, I also want to realize the sudden blade failure, such as changes of the blade stiffness, and the corresponding mode shape of the blade in the middle of the FAST simulation, as you have mentioned before. Now I found the variables in the elastoDyn.f90., i.e. FlpStff,EdgStff, GJStff,(these ...
by Yichau.Liu
Tue Oct 16, 2018 2:50 am
Forum: Computer-Aided Engineering Software Tools
Topic: How to insert the fault/failure of the offshore wind turbine into the FAST code
Replies: 3
Views: 1083

Re: How to insert the fault/failure of the offshore wind turbine into the FAST code

Dear Jason, Many thanks for your reply and I got some ideas. Now, I use the Simulink to design a simple induction generator and pitch controller for 5MW baseline offhore wind turbien according to your report “Simulation for wind turbine generators-with FAST and MATLAB-Simulink Modules”. In detail, I...
by Yichau.Liu
Wed Oct 10, 2018 6:34 am
Forum: Computer-Aided Engineering Software Tools
Topic: How to insert the fault/failure of the offshore wind turbine into the FAST code
Replies: 3
Views: 1083

How to insert the fault/failure of the offshore wind turbine into the FAST code

Dear Jason, My current research is failure/fault detection and diagnosis of the offshore wind turbine. I want to diagnose the failure/faults by the FAST simulations. I have one question: How can I insert the mechnical or electrical fault/failure of the different components of the offshore wind turbi...
by Yichau.Liu
Sun Jan 21, 2018 9:25 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Two questions about the modelling of the OC3 Hywind model
Replies: 3
Views: 474

Re: Two questions about the modelling of the OC3 Hywind model

Dear Jason: Thanks for your help. Following your suggestions, I am considering the structural terms of M, C, K derived from FAST v7. To the best of my knowlege, the linearized matrix K includes the aerodynamic term (K_aero), the hydrostatic term (K_hydrostatic), the gravitational term (K_grav) and t...
by Yichau.Liu
Sat Jan 13, 2018 10:06 am
Forum: Computer-Aided Engineering Software Tools
Topic: Two questions about the modelling of the OC3 Hywind model
Replies: 3
Views: 474

Two questions about the modelling of the OC3 Hywind model

Dear Jason: The first question is : I am trying to simulated the six DOFs free decay tests of the OC3 Hywind model using the FAST v7 and FAST v8 respectively. However, I found that the results of dynamic responses of OC3 are different, which makes me confused. The model configurations in FAST v7 and...
by Yichau.Liu
Sun Dec 18, 2016 6:38 pm
Forum: Computer-Aided Engineering Software Tools
Topic: FAST theory manual
Replies: 218
Views: 27018

Re: FAST theory manual

Dear Jason,

Could you send me the unofficial FAST theory manual and user's guide for FAST v8 as well? My email address is : liuyc14@mails.tsinghua.edu.cn

Thank your very much.

Best regards,
by Yichau.Liu
Sat Dec 17, 2016 9:56 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Some questions about the MoorDyn module
Replies: 1
Views: 377

Some questions about the MoorDyn module

Dear Jason: I am using the FAST v8 to model the offshore wind turbine and the semi-submersible type of floating structure (OC4 DeepCwind in Test 25) is used. In fact, I aim to investigate the dynamics of wind turbine in different water depth such as 50m, 100m, 200m, 300m etc (We assume it is feasibl...

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