Hi, I am going on the subject of 2 blade wind turbine
I do not the reason that why teeter degree is going under 10 deg in condition of below certain TeetSSSp in openFAST.
---------------------- ROTOR-TEETER --------------------------------------------
1E+7 TeetSSSp - Rotor-teeter soft-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
1.0401E+10 TeetHSSp - Rotor-teeter hard-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
This is a part of my teeter file. I want to figure out a minimum value of SSSp. Because, firstable, i don’t consider about fatigue now. I just only want to see the decrease of load at the blade root and tower base. I calculated the c and k values by referencing other papers and used a value of about 2E+8. For reference, the model I’m using is the 22 MW turbine model. When I used that SSSp value, the loads in the x-direction at the two previously mentioned locations did not decrease; instead, they actually increased. I expected that enabling the teeter function would reduce the loads, but they did not decrease at all. Therefore, while I was trying to reduce the k value slightly, I found a strange result. When I set k below 1E+7, the OpenFAST simulation showed the teeter angle dropping rapidly to −11deg and failing to recover. Why does this happen?
Thank you for reading.
Best regards,
Jihan Kim
