NuMAD Stiffness and Mass Matrices

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Deniz.Kepez
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Organization: Self
Location: Turkey

NuMAD Stiffness and Mass Matrices

Postby Deniz.Kepez » Thu Mar 25, 2021 4:29 pm

Hi,

I am trying to obtain my 6x6 mass and stiffness matrices through NuMAD. NuMAD output is designed for FAST7 I guess and I can only obtain ElastoDyn input files through it. While looking for the interim output files in NuMAD, I find the stiffness matrices. However, non-diagonal terms in these matrices are not zero. Would it be a problem for BeamDyn? Also, how can I obtain mass matrices I could not find any.

Best regards,
Deniz

Jason.Jonkman
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Re: NuMAD Stiffness and Mass Matrices

Postby Jason.Jonkman » Sat Mar 27, 2021 7:26 am

Dear Deniz,

I don't personally have much experience with NuMAD; hopefully someone else on this forum can comment on where to find the mass matrices.

The BeamDyn module of OpenFAST does accept as input full 6x6 mass and stiffness matrices, including nonzero off-diagonal terms.

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

Deniz.Kepez
Posts: 8
Joined: Mon May 25, 2020 4:25 pm
Organization: Self
Location: Turkey

Re: NuMAD Stiffness and Mass Matrices

Postby Deniz.Kepez » Sat Mar 27, 2021 6:29 pm

Dear Dr.Jason

Thank you for your reply. I think I have found the mass matrices. If anyone need it they are located inside the 'admout.txt' interim result file and also stiffness matrices are located inside the 'kout.txt' file.

Best regards,
Deniz

Edit: I was mistaken. It was not the mass matrices file.


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