Bend-twist coupling

Discuss theory and modeling of wind-turbine structures.

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Dhivya.Sundar
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Joined: Wed Sep 04, 2019 1:19 am
Organization: Nanyang Technological University
Location: Singapore

Bend-twist coupling

Postby Dhivya.Sundar » Thu Dec 12, 2019 2:24 am

Hello

I am trying to study the effect of bend-twist coupling on the structural mechanics of a wind turbine blade using FAST. In order to incorporate the coupling using the anisotropic property of composite laminates can I possibly change the stiffness matrices in the blade input file with the laminate stiffnesses? Is that enough?

Jason.Jonkman
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Re: Bend-twist coupling

Postby Jason.Jonkman » Thu Dec 12, 2019 6:48 am

Dear Dhivya,

There are two ways to induce bend-twist coupling in a blade...through the geometry of the blade and through an anisotropic composite laminate layup. Both of these effects can be simulated in the BeamDyn module of FAST / OpenFAST. For the latter, BeamDyn allows the user to specify the full 6x6 stiffness matrix at each beam cross section, which allows for analyzing any anisotropic composite laminate layup.

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

National Renewable Energy Laboratory (NREL)
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