Comments (3)
Dear @winder365,
A similar question was recently asked on our forum, although I don't understand and not as expected: https://forums.nrel.gov/t/beamdyn-the-blade-modal-are-calculated-using-the-beamdyn-sum-file/6258.
Best regards,
from openfast.
Dear @jjonkman ,
As you direction, I browse the url "https://forums.nrel.gov/t/beamdyn-the-blade-modal-are-calculated-using-the-beamdyn-sum-file/6258."
However, the results I got maybe wrong.
by solve the eigenvalue and eigenvector of the matrix K_BD*inv(M_BD), the eigenvalue matrix (30x30) was obtained as below:
The eigenvalue ω^2 ( (rad/s)^2) above are too large, which are not consistent with that of NREL-5MW blade.
The case I use is from "https://github.com/OpenFAST/r-test/tree/main/modules/beamdyn/bd_5MW_dynamic", and the order_elem is equal to 5. So the full system matrix from the ".sum" file is 36x36, and I have eliminated the first six rows and columns .
Thank for your attention.
from openfast.
Dear @winder365,
Derek Slaughter has now responded on the forum with the solution.
Best regards,
from openfast.
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