Search found 3 matches

by Matthew.Lackner
Thu Dec 20, 2018 10:28 am
Forum: News and Announcements
Topic: Modeling Workshops
Replies: 15
Views: 46325

Online FAST Course from UMass in Spring 2019

Dear NWTC forum members, My colleagues and I are offering an online course in the Spring 2019 semester on wind turbine simulation using FAST (specifically we will use OpenFAST). Students will learn how to download and run FAST, how to generate and modify input files, how to run various simulation co...
by Matthew.Lackner
Fri Apr 21, 2017 11:42 am
Forum: Structural Analysis
Topic: Tower natural frequencies using ElastoDyn and SubDyn
Replies: 3
Views: 1268

Re: Tower natural frequencies using ElastoDyn and SubDyn

Thanks Jason. In regards to the source of those two modes, whether SubDyn or the rotor, I should also mention that when we tune a TMD to the 4th mode, we get substantial reduction in the frequency response at that frequency. Also we're in a parked condition, so it's not related to the rotational fre...
by Matthew.Lackner
Fri Apr 21, 2017 8:05 am
Forum: Structural Analysis
Topic: Tower natural frequencies using ElastoDyn and SubDyn
Replies: 3
Views: 1268

Tower natural frequencies using ElastoDyn and SubDyn

Jason, apologies if this has been answered before, I couldn't find it. Recently we simulated the NREL 5 MW mounted on a monopile in 20 m of water. The tower is modeled in ElastoDyn, with 2 FA and 2 SS modes, and the monopile is modeled in SubDyn. We ran a ULS case that includes breaking waves, and t...

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