Fatigue load reduction of bldae

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Jason.Jonkman
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Location: Boulder, CO
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Re: Fatigue load reduction of bldae

Postby Jason.Jonkman » Sat Mar 20, 2021 9:10 am

Dear Kenneth,

Can you share it through a file-sharing platform like Google drive?

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

KennethPaul.Dsouza
Posts: 12
Joined: Mon Oct 28, 2019 5:30 am
Organization: Indian Institute of Technology, Madras
Location: India

Re: Fatigue load reduction of bldae

Postby KennethPaul.Dsouza » Sat Mar 20, 2021 12:03 pm

Dear Jason,

I have attached the link for the file below

https://drive.google.com/file/d/19J_3dk ... sp=sharing

Regards
Kenneth

Jason.Jonkman
Posts: 5765
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Fatigue load reduction of bldae

Postby Jason.Jonkman » Sat Mar 20, 2021 2:24 pm

Dear Kenneth,

I plotted your time series and confirm that the rotor is spinning at 12.1 rpm. I used my own MATLAB-based PSD script, which calculates the PSD directly via FFT and get the result I expect--i.e., that RootMyc1 has peaks at the rotor speed (about 0.2 Hz) and its harmonics. See the raw and binned (based on 10 frequency steps per bin) PSDs, as well as my MATLAB script (Jason_PSD.m) attached. I'm not sure why you are not getting the PSD result you expect out of MCrunch (I'm not too familiar with its options), but I would guess it has something to do with the windowing applied.

PSDOfRootMyc1.png
PSD of RootMyc1
PSDOfRootMyc1.png (29.24 KiB) Viewed 193 times

Jason_PSD.m.txt
Jason_PSD.m
(2.73 KiB) Downloaded 17 times

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

KennethPaul.Dsouza
Posts: 12
Joined: Mon Oct 28, 2019 5:30 am
Organization: Indian Institute of Technology, Madras
Location: India

Re: Fatigue load reduction of bldae

Postby KennethPaul.Dsouza » Mon Mar 22, 2021 4:30 am

Dear Jason,

Thank you for the script as well as helping me in sorting the issue.

Regards,
Kenneth


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