Search found 33 matches

by Alessandro.Cetrini
Thu Mar 29, 2018 7:44 am
Forum: Structural Analysis
Topic: Static analysis Adams model from Fast
Replies: 1
Views: 1723

Static analysis Adams model from Fast

Dear Jason, I am doing many analyses with the Adams model that I obtained from FASTv.7 with the flexible tower. In these analyses I exported the tower top acceleration of the tower with a "measure" ACCZ(..) when the rotor is free ( I deleted the Hss Motion). But even if the wind has always...
by Alessandro.Cetrini
Wed Feb 28, 2018 4:30 am
Forum: Structural Analysis
Topic: Tower Top FA displacemente FAST v7 VS Adams
Replies: 20
Views: 2711

Re: Tower Top FA displacemente FAST v7 VS Adams

Dear Jason, Thank you for your answer, it helped me! I have another question regarding Adams model obtained from Fast v7. If i use "FAStTunr" in Tower file different from 1.0 will the .adm file be different from the one that I obtain with 1.0 coefficients? I have made a comparison between ...
by Alessandro.Cetrini
Tue Feb 27, 2018 2:48 am
Forum: Structural Analysis
Topic: Tower Top FA displacemente FAST v7 VS Adams
Replies: 20
Views: 2711

Tower Top FA displacemente FAST v7 VS Adams

Dear Jason, I need to make a comparison between the Fast v7 model of a wind turbine for the parameter "TTDSpFA" and the Equivalent Adams model. I have to make this comparison in Simulink. To export the simulink model from the Adams one I need to define input and output variables. So I need...
by Alessandro.Cetrini
Wed Feb 14, 2018 9:07 am
Forum: Controls
Topic: Variable speed generator torque control
Replies: 3
Views: 2271

Re: Variable speed generator torque control

Dear Jason, Thank you for your answer! So can you say me wich is the formula for Taero or how can I extract it from Fast? Because I want to calculate the Taero for different rotor rpm and apply a GeTq that is the same so that I can reach an equilibrium condition for the LSS( and HSS). It is right? T...
by Alessandro.Cetrini
Tue Feb 13, 2018 4:09 pm
Forum: Controls
Topic: Variable speed generator torque control
Replies: 3
Views: 2271

Variable speed generator torque control

Dear Jason, I'm using Fast v7 and I need to do a simple generator torque control in Simulink. My first question is: the Generator Torque (that is one of the control inputs in Simulink block) in a "resistant" torque applied to the HSS from the generator right? and this is the same value tha...
by Alessandro.Cetrini
Thu Dec 14, 2017 9:08 am
Forum: Structural Analysis
Topic: Ultimate Load Mlife
Replies: 6
Views: 3017

Re: Ultimate Load Mlife

Dear Jason , thank you for the answer! I used 510 (MPa) as ultimate strength for the tower just to have reasonable values for the damage in my matlab routines that give the same results of MLife . I'm using Fast v7 beacuse I need the Adams model generated automatically by Fast but I will learn Fast8...
by Alessandro.Cetrini
Wed Dec 13, 2017 2:31 am
Forum: Structural Analysis
Topic: Ultimate Load Mlife
Replies: 6
Views: 3017

Re: Ultimate Load Mlife

Dear Jason, Sorry, I meant 1.5 MW wind turbine, Test11! do you think my calculations are correct? Another question! Which Test number corresponds to the NREL 5MW wind turbine? I'have never seen that in the Fast7 archive! If it is possible I would like to know these values also for the 5MW turbine! T...
by Alessandro.Cetrini
Wed Dec 13, 2017 2:13 am
Forum: Structural Analysis
Topic: Ultimate Load Mlife
Replies: 6
Views: 3017

Re: Ultimate Load Mlife

Dear Jason, thank you for your answer! Can you suggest me reasonable values for LUlt in Mlife for the TwrBsMxt and RootMxc1 in Test11 in Fast 7 ( 5MW wind turbine)? From my calculations I supposed that the tower is made by Steel with density=7500 (kg/m^3) , E=2.1*10^11(N/m^2) and I found D and d for...
by Alessandro.Cetrini
Mon Dec 11, 2017 2:51 am
Forum: Structural Analysis
Topic: Ultimate Load Mlife
Replies: 6
Views: 3017

Ultimate Load Mlife

Dear Jason, I need to use Mlife for fatigue analysis on wind turbine tower but to do this I need to know the ultimate Load "Lult". Is to correct to compute Lult this way ? - I calculate the section moment of inertia of the tower for the section where I have the moment time history from Fas...
by Alessandro.Cetrini
Tue Nov 07, 2017 6:42 am
Forum: Structural Analysis
Topic: Ansys model tower
Replies: 12
Views: 3458

Re: Ansys model tower

Dear Jason, Thank you for your answer. To obtain the natural frequencies I 've used a Fast v7 linearization with RotSpeed=0, no Aerodynamic forces calculated and only tower DOFs activated. I'm not sure I've fully understood your answer but you let me think about generating an Adams model of test07 f...
by Alessandro.Cetrini
Tue Nov 07, 2017 4:52 am
Forum: Structural Analysis
Topic: Ansys model tower
Replies: 12
Views: 3458

Re: Ansys model tower

Dear Jason, Thank you for your answer. I've tried my method for sections parameters and putting the top mass at the tower top I've obtained good results for Test07: Fast says: 1.6 Hz for the 2 first frequencies and 10.5 Hz for the 2 second frequency. With my method instead I have 1.8 Hz and 11 Hz BU...
by Alessandro.Cetrini
Mon Nov 06, 2017 3:39 pm
Forum: Structural Analysis
Topic: Ansys model tower
Replies: 12
Views: 3458

Ansys model tower

Dear Jason, I have to do an Ansys model of the Test07 tower because I want to import it as mnf in an Adams model generated by Fast v7. Before importing the tower in Adams as mnf I want to create an Ansys model that gives me the same eigenfrequency given by Fast linearization for the tower. I was thi...
by Alessandro.Cetrini
Thu Oct 26, 2017 2:28 am
Forum: Inflow Turbulence
Topic: How to generate a wind timehistory with a given PDF and PSD
Replies: 6
Views: 3115

Re: How to generate a wind timehistory with a given PDF and PSD

Dear Jason,

Thank you for your answer. I was thinking about generating a short wind time history (many seconds) from a given PSD and with a WEibull PDF. so in your opinion is it meaningless to generate a short time history with a Weibull PDF ? Should I use a Gaussian PDF for this case?
thank you!
by Alessandro.Cetrini
Wed Oct 25, 2017 3:31 am
Forum: Inflow Turbulence
Topic: How to generate a wind timehistory with a given PDF and PSD
Replies: 6
Views: 3115

How to generate a wind timehistory with a given PDF and PSD

Hi all,

I would like to know if someone knows how to generate a wind timehistory in MATLAB with a given Weibull PDF and a given PSD .
by Alessandro.Cetrini
Wed Oct 11, 2017 1:18 am
Forum: Controls
Topic: Exporting simulink data during simulation
Replies: 0
Views: 5428

Exporting simulink data during simulation

Hi, I have to export the Simulink output data of the Fast model in "real-time" but I don't know how to do it! Can anyone help me? If iI use the "To Workspace" block I can export the data only when the simulation ends but I want them for each time step. I tried to write this in Ma...

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