Doubt about Extptfm_SE Inputs

Hi community, I’m a Brazilian researcher and I have been studying OpenFAST to simulate the foundations of fixed-bottom offshore wind turbines that will be constructed in Brazil. Our goal in OpenFAST is to find the resultant moment, force, and displacement at the interface between the superstructure and the foundation. I know the best module to do this is ExtPtfm, but it’s the one I cannot understand despite several queries.

I need to know how I can get the Superelement Input File Matrices (Mass, Stiffness, Damping, and Load and Wave Excitation) from the macro-features of the substructure and the wave conditions.

Thanks in advance.

Dear @Matheus.Abreu,

What software are you using to model the fixed-bottom offshore substructure and can this software output the mass, stiffness, damping, and force matrices/vector directly?

If the software you are using cannot output these things, perhaps it is better to use SubDyn and HydroDyn within OpenFAST directly rather than relying on ExtPtfrm.

Best regards,

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