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NREL / ROSCO

A Reference Open Source Controller for Wind Turbines
https://rosco.readthedocs.io/en/latest/
Apache License 2.0
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FA e SS aerodynamic damping for IEA 15 MW monopile #389

Closed Fede-274 closed 2 hours ago

Fede-274 commented 2 weeks ago

I am testing IEA 15 MW monopile on Fast to evaluate aerodynamic damping fore-aft e side-to-side, starting from the decay of the fore-aft and side-to-side motion of the tower top after being stimulated by a wind step (es. 7 m/s --> 8 m/s) in the fore-aft motion. I am using the assumption of:

  1. steady wind conditions
  2. no wave excitation
  3. no structural damping (both fore-aft and side-to-side)
  4. no yaw degree of freedom of the nacelle

To compute aerodynamic damping I am using Matlab script of the Logarithmic Decrement method and the Moving Block technique. Is the idea right? Does anyone has similar graphs of aerodynamic damping for each steady wind speed from cut-in to cut-off? What is the trend like?

dzalkind commented 2 weeks ago

Hi, this modeling question may be better suited for the OpenFAST forum (https://forums.nrel.gov/).