Hi,
I have the data from an original turbine for Tower Mass density, fore-aft and side-side stiffness as well as the tower dimensions. That’s the only data I have.
Is there a way to compute the fore-aft and side-side coefficients from that data.
Best regards,
Karthik
Dear @Karthik.Prakash,
With the data you have, you should be able to compute the cross-sectional mass per unit length and tower fore-aft and side-side bending stiffness (TMassDen, TwFAStif, TwSSStif in the ElastoDyn module of OpenFAST). The only other thing you need to compute the tower mode shapes for ElastoDyn is the tower-top (rotor-nacelle assembly) mass, center of mass, and inertias. For offshore systems, you’d also have to know information about the substructure mass and stiffness.
Best regards,
Many Thanks for the reply @Jason.Jonkman
Is there a way I can calculate or obtain the coefficients for the tower fore-aft and side-side mode shapes with the available data.
Dear @Karthik.Prakash,
Once you obtain the mode shapes of the tower (e.g., using BModes), you could fit a polynomial to the mode shapes to obtain the coefficients (e.g., using ModeShapePolyFitting.xls).
Best regards,