Using Mlife for a lifetime fatigue estimation

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Re: Using Mlife for a lifetime fatigue estimation

Postby Jason.Jonkman » Thu Apr 01, 2021 1:23 pm

Dear Andriana,

MLife can be used to post-process the fatigue of mooring line tensions (in terms of DELs, lifetime damage, etc.) just like it can with any other turbine or support structure load.

That said, MAP++, being a quasi-static model, does well at predicting the mean and low-frequency mooring line loads, but not the dynamic / high frequency mooring line loads. So, I would expect the mooring line tension ultimate and fatigue loads to be underpredicted by MAP++. MoorDyn is better when mooring line loads are to be analyzed.

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

National Renewable Energy Laboratory (NREL)
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+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov


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