FAST-linearization of a wind turbine with pitch imbalance

Wind & Water Computer-Aided Engineering Software Tools
1

Dear all,

I am performing linearization analysis using FAST (3-bladed NREL 1.5 MW). I want to linearize a wind turbine with pitch imbalance, e.g. an pitch offset of 0° / 0.3° / -0.3° for the three blades. It is appreciated if someone could give me a hint for linearizing thus a wind turbine by using FAST.

Thanks in advance.

Best wishes to you all

Chao Yang
Aalborg university, Denmark

2

Dear Chao,

A similar question was asked and answered in the following forum topic: Linearization in FAST with unbalanced Rotor.

Best regards,

3

Dear Jason,

Thank you very much for your fast reply.

I have read your mentioned topic “viewtopic.php?f=4&t=866”. But the topic is about lineariztion of an unbalance wind turbine with different blade mass. Now what i want to do is to linearize a wind turbine with different pitch mounting angle. What i mean about the so-called pitch mounting angle is the initial pitch angle when we mounting the three blades.

Hope you could give me some advises on how to linearize thus a wind turbine with different pitch mounting angle, e.g. 0° / 0.3° / -0.3° for the three blades.

Thanks again and best wishes.

Chao Yang
Aalborg university, Denmark

4

Dear Chao,

You can set different initial pitch angles so as to create an aerodynamic imbalance in a FAST linearization analysis except when using the TrimCase = 3 (find collective pitch) option for calculating a periodic steady state solution.

Best regards,

5

Dear Jason,

Thanks a lot for your guidance. I will try it.

Kind regards

Chao Yang

Aalborg University, Denmark