Design a state feedback controller instead of output feedback controller

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Behzad.Heydaryan
Posts: 3
Joined: Fri Feb 22, 2019 10:29 pm
Organization: Sharif University of Technology
Location: Iran

Design a state feedback controller instead of output feedback controller

Postby Behzad.Heydaryan » Tue Nov 05, 2019 5:26 am

Dear Jason Jonkeman,

I have a problem with the state-space vector of the linear model that FAST generates at a particular speed (for example 14 m/s).
The problem is that when generating the state-space matrices (AvgAMat, AvgBMat, ...) is finished, in the file with the format .lin we have the operating points for the outputs, inputs, and states. In the .lin file, the units of the outputs and inputs (u,y) exist but the units of states in the state vector don't exist. Therefore, If I want to design a state-space feedback controller (u=Kx) I will need the units of the states at the operating points. How can I find the units (deg, deg/s, rpm, ...) for the states?

Sincerely,
Behzad
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Jason.Jonkman
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Location: Boulder, CO
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Re: Design a state feedback controller instead of output feedback controller

Postby Jason.Jonkman » Thu Nov 07, 2019 10:59 am

Dear Behzad,

Which degrees of freedom have you enabled in FAST v7?

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
nwtc.nrel.gov

Behzad.Heydaryan
Posts: 3
Joined: Fri Feb 22, 2019 10:29 pm
Organization: Sharif University of Technology
Location: Iran

Re: Design a state feedback controller instead of output feedback controller

Postby Behzad.Heydaryan » Sat Nov 09, 2019 12:40 am

I have enabled the GenDOF and PtfmPDOF.
2 degrees of freedom. 4 states.

Jason.Jonkman
Posts: 4338
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Design a state feedback controller instead of output feedback controller

Postby Jason.Jonkman » Sat Nov 09, 2019 12:50 am

Dear Behzad,

Both of these DOFs are angular rotations; the angles are in radians and the angular rates are in rad/s.

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
nwtc.nrel.gov

Behzad.Heydaryan
Posts: 3
Joined: Fri Feb 22, 2019 10:29 pm
Organization: Sharif University of Technology
Location: Iran

Re: Design a state feedback controller instead of output feedback controller

Postby Behzad.Heydaryan » Sat Nov 09, 2019 5:45 am

Dear Jason Jonkman,

Thank you for your kind reply.

Regards,
Behzad


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