Search found 13 matches

by Masih.Vahid
Mon Feb 12, 2018 5:53 am
Forum: Computer-Aided Engineering Software Tools
Topic: Resonance frequencies
Replies: 1
Views: 163

Resonance frequencies

Dear Jason, I'm trying to find the resonance frequencies of surge and pitch, but in the simulation results I can't see any resonances. I have changed the pitch stiffness, AxCds and MemberCds, but I can't see any changes in the results. Also I have turned on the towerDofs but I can't see the 3p reson...
by Masih.Vahid
Wed Feb 07, 2018 11:45 am
Forum: Computer-Aided Engineering Software Tools
Topic: Producing Step wind or wind gust
Replies: 3
Views: 238

Re: Producing Step wind or wind gust

Dear Jason,

Thank you for your answer. Are you sure this is the right link? Because there I couldn't find any post from you on that date.

Best regards
Masih
by Masih.Vahid
Fri Feb 02, 2018 3:59 am
Forum: Computer-Aided Engineering Software Tools
Topic: Producing Step wind or wind gust
Replies: 3
Views: 238

Producing Step wind or wind gust

Dear all, I'm trying to check if my controller is functioning well and I need to check its response to wind gust &\ step wind. Is there a function implemented in FAST for that? If not how would you recommend to do so? I checked the FAST and AeroDyn manuals but couldn't find much. Best regards Ma...
by Masih.Vahid
Fri Feb 02, 2018 3:43 am
Forum: Structural Analysis
Topic: Foundation Stiffness and damping in FAST v8
Replies: 24
Views: 7122

Re: Foundation Stiffness and damping in FAST v8

Dear Jason, yes I run the simulation and get acceptable results with the workaround that you have recommended. I just wanted to know if the error is fixed and I get the error because I'm doing sth wrong while simulating with the potmod only. Now I know that it's not fixed yet. Thank you for your ans...
by Masih.Vahid
Thu Feb 01, 2018 3:11 am
Forum: Structural Analysis
Topic: Foundation Stiffness and damping in FAST v8
Replies: 24
Views: 7122

Re: Foundation Stiffness and damping in FAST v8

Dear Patrick, I was able to reproduce your error when I set up a similar model myself. It appears that there is a bug in HydroDyn preventing it from functioning properly when a model has no strip-theory nodes (NJoints = NMembers = 0). We'll fix this in a future release of HydroDyn. In the meantime,...
by Masih.Vahid
Thu Jan 18, 2018 9:36 am
Forum: Computer-Aided Engineering Software Tools
Topic: Reference points for wave excitaions and platform movements
Replies: 1
Views: 223

Reference points for wave excitaions and platform movements

Dear Jason, I'm simulating a triple-spar in FAST and I recognized there is a phase difference between my wave elevation and surge and pitch motions. I could say that a part of this is probably because of the inertia but I wonder if there are other reasons for that. So my question is, as I'm importin...
by Masih.Vahid
Mon Jan 15, 2018 1:38 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Second-order waves
Replies: 1
Views: 249

Second-order waves

Dear Jason, I've set the WaveMod in HydroDyn to 5 and I'm using an externally generated irregular wave elevation time series. Despite setting the 2ND-order waves Flag to true for both mean and difference-frequencies, I'm getting linear waves in the output channel. Could you tell me what I could do t...
by Masih.Vahid
Mon Nov 20, 2017 9:37 am
Forum: Computer-Aided Engineering Software Tools
Topic: Wave elevation time series
Replies: 2
Views: 217

Re: Wave elevation time series

Dear Jason,

thank you for your prompt answer. I guess I know what the problem is now.

regards
Masih
by Masih.Vahid
Fri Nov 17, 2017 4:42 am
Forum: Computer-Aided Engineering Software Tools
Topic: Wave elevation time series
Replies: 2
Views: 217

Wave elevation time series

Dear all, I'm trying to run a simulation with Fast for a triple spar offshore wind turbine. I've set the WaveMod in HydroDyn to 5 and I'm using an externally generated wave elevation time series. The problem is that after the simulation, when I compare the Wave1Elev channel results with the input wa...
by Masih.Vahid
Thu Oct 12, 2017 2:43 am
Forum: General
Topic: small values for thrust, surge and pitch
Replies: 1
Views: 599

small values for thrust, surge and pitch

Dear Dr. Jonkman, I'm trying to model the DTU scaled 10MW wind turbine with the triple spar platform in Fast. Although my decay test simulations show a good correlation with the experiments, I'm getting too small values for thrust and platform surge and pitch which don't compromise with the experime...
by Masih.Vahid
Tue Jul 25, 2017 2:19 am
Forum: Structural Analysis
Topic: Large displacement
Replies: 1
Views: 789

Large displacement

Dear Dr. Jonkman I'm trying to do an equilibrium test on a floating scaled wind turbine on a triple spar platform but as soon as I turn on the roll and pitch DOFs in ElastoDyn the fast aborts with the following error: FAST_Solution:FAST_AdvanceStates:ED_ABM4:ED_CalcContStateDeriv:SetCoordSy:Small an...
by Masih.Vahid
Thu Jul 13, 2017 3:54 am
Forum: Wave Energy
Topic: Problem in MAP and MoorDyn
Replies: 6
Views: 1629

Re: Problem in MAP and MoorDyn

Dear Dr. Jonkmann,

Thanks a lot for your answer. I figured it out. I had a wrong input in the .fst file.

Thank you again.

Masih
by Masih.Vahid
Wed Jul 12, 2017 6:53 am
Forum: Wave Energy
Topic: Problem in MAP and MoorDyn
Replies: 6
Views: 1629

Re: Problem in MAP and MoorDyn

Dear Dr. Jonkmann, I'm trying to model a floating wind turbine but I'm constantly getting this error. I can't understand how to solve the problem. this is the Moordyn Input file: --------------------- MoorDyn Input File ------------------------------------ Mooring system for the DTU 10MW Reference W...

Go to advanced search