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OpenFAST / openfast

Main repository for the NREL-supported OpenFAST whole-turbine and FAST.Farm wind farm simulation codes.
http://openfast.readthedocs.io
Apache License 2.0
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Feature request -- How to calculate the natural frequency of the NREL 5MW blade through BeamDyn #1115

Closed ZL6462 closed 2 years ago

ZL6462 commented 2 years ago

Dear all,

I have known that that we can calculate the natural frequency of the NREL 5MW blade through BeamDyn, however I am wondering how to realize that.

Thank you for your attention. Best regards,

jjonkman commented 2 years ago

Dear @ZL6462,

The linearization functionality of OpenFAST, followed by post-processing using MBC3 to perform eigenanalysis, can be used to compute the mode shapes, natural frequencies, and damping of the full wind turbine system (including blades modeled in BeamDyn) in both parked/idling and operating conditions (with the rotor spinning). The eigenanalysis approach has been discussed many times before, and is documented here: https://github.com/OpenFAST/matlab-toolbox.

Please note that recent improvements to BeamDyn are needed to obtain accurate linearized solutions when BeamDyn is enabled: https://github.com/OpenFAST/openfast/pull/1050.

Best regards,

ZL6462 commented 2 years ago

Dear @jjonkman ,

Thank you for your quick and useful answer, I will try that as your instruction. Best regards,