Simulation of an offshore Wind turbine 5MW based DFIG

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Jason.Jonkman
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Re: Simulation of an offshore Wind turbine 5MW based DFIG

Postby Jason.Jonkman » Wed Mar 21, 2018 7:39 pm

Dear Ali,

The first and second flapwise modes are the first two bending modes of the blade (associated with the first and second natural frequencies, respectively).

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Ali.Elyaakoubi
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Organization: abdelmalek Essaadi University
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Re: Simulation of an offshore Wind turbine 5MW based DFIG

Postby Ali.Elyaakoubi » Thu Mar 22, 2018 8:23 am

Sorry for my multiples asking, but my thesis is based on this code AND I nedded to know these details
Tel me again if some structures of the code are based on finite element method, or what position of this method in this simulateur


Sincerely yours

Jason.Jonkman
Posts: 3753
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Simulation of an offshore Wind turbine 5MW based DFIG

Postby Jason.Jonkman » Thu Mar 22, 2018 8:51 am

Dear Ali,

The SubDyn module of FAST is based on a linear beam finite-element approach and the BeamDyn module of FAST is based on a nonlinear beam finite-element approach. I wouldn't call the ElastoDyn module a finite-element approach, although the tower and blades are similar to a finite-element approach in that shape functions (in this case mode shapes) are used to form generalized mass, stiffness, and damping matrices (and geometric nonlinear terms as well). However--as described in the forum topic I linked above: viewtopic.php?f=4&t=424 --ElastoDyn employs a combined modal and multibody dynamics formulation.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov


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