NWTC

Dear Jason, Thank you very much for your quick response. The new value clarifies the calculation. Nevertheless the value of 2,607,890 kg•m2 posted on NREL 5MW, refers to Nacelle inertia about Yaw axis. This value is not calculated as only I=mr^2, isn't it? Which components contribute to this inertia...

Dear Jason, I am trying to estimate the values of YawSpr and Yaw Damp, when I came across with this post where these variables a defined as; YawSpr = YawIner•ωn^2 YawDamp = 2•ζ•YawIner•ωn I was doing some test trying to get the same values as are shown on NREL 5MW example and DOWEC 6MW PREDESIGN. Ac...

Dear Jason, I am trying to understand how Fast V7 calculates the RotSpeed. I have been doing some test trying to set the same torque constant "K" for different winds speed and depending on the value the Rotspeed changes a lot for low wind speeds. Could you explain to me the relation betwee...

Dear Jason,

Thank you again for your answer. I will take a look to the report. I too wish to take this opportunity to congratulate you and your team for this forum. It really helps a lot.

Best regards,

Dear Jason, Thank you a lot for your reply. As I suspected, I was defining these values wrong. Nevertheless I still have some doubts about how to calculate these values. VS_RtGnSp: Equal to the generator rated speed. According to my synchronous generator data, it would be 1680 rpm. According to my d...

Hello everybody, I am relative new to Fast and i am trying to simulate the behavior of a 2MW onshore turbine. I would be very grateful if someone could solve/help me with some issues. I am using FAST v7 (FAST_v70001a-bjj) and I want to simulate the behaviour of a 2MW onshore turbine, pitch regulated...