questions about reference control input

This forum if for discussing controls. Questions about how to implement controls in FAST are more appropriate to the CAE Tools forum.

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Jason.Jonkman
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Re: questions about reference control input

Postby Jason.Jonkman » Sat Jul 13, 2019 6:33 am

Dear Kumara,

When looking from the root to the tip, the positive pitch and twist angles in FAST are counter-clockwise rotations from the rotor plane to the chord about the pitch axis.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
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KumaraRaja.Eedara
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Re: questions about reference control input

Postby KumaraRaja.Eedara » Mon Jul 15, 2019 1:14 am

Thanks, Jason. That is helpful. Basically clock-wise rotations about -z axis of blade coordinate system (Fig 9, pg 10 FAST manual) are positive (for both pitch and twist). For an up-wind turbine such a rotation causes leading edge more into upwind.
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