NWTC

Dear Jason, Recently I have some doubt about tower damping,Usually the steel have 0.005 damping ratio we setting in the model.But Some tower have lower concrete and upper steel. There are two kinds of materials. I do not sure how much the damping ratio shoud be in the model. Could you give me some g...

Dear Bonnie, Thank you very much for your reply in time. As the 'https://github.com/OpenFAST/openfast/issues/152',I move the InflowWind part to other place.It succeed to compile. I found in the FAST folder there are two file (the .sln and .vfproj).Are they same to use? what's the difference between ...

Dear Jason, Thank you very much.with your help ,the problem about "fatal: not a git repository"disappeared.But the other questions still exist 1>------ 已启动全部重新生成: 项目: FAST_Registry, 配置: Release_Double x64 ------ 1> data.c 1>..\..\modules-local\fast-registry\src\data.c(141): warning C4101: ...

Dear Jason,

Thank you for your reply,but I cann't find any help documents about super control from SOWFA and FLORIS. Do you publish that in the fast.farm?

Best Regards

Ruiliang.Wang

Hello,Jason

I want to know something about super control about FAST.farm, Do you have some paper or draft about that.I want to learn that.

Best Regards

Ruiliang.Wang

hello Jason, I have a problem about OpenFAST recompile.I recompile as the website https://openfast.readthedocs.io/en/latest/source/install/install_vs_windows.html, But the error like below: 1>------ 已启动生成: 项目: FAST_Registry, 配置: Release_Double x64 ------ 1> data.c 1>..\..\modules-local\fast-registry...

Dear Jason, Recently I found a question about rainflow counting, In the FAST the half cycle are included in the rainflow counting ,But In the Bladed, there are no half cycles ,But the sum of counting is same. I really don't know which way is most accurate . Particularly,when the range is large ,if t...

Dear Jason. The whole errors and warnning are displayed below 警告 1 warning C4101: “q”: 未引用的局部变量 D:\Software\openfast-1.0.0\openfast-1.0.0\modules-local\fast-registry\src\data.c 141 1 FAST_Registry 警告 2 warning C4101: “tmp2”: 未引用的局部变量 D:\Software\openfast-1.0.0\openfast-1.0.0\modules-local\fast-regis...

hello,Jason
Yes, I'm using the the Visual Studio project named FAST.vfproj in vs-build folder provided with OpenFAST v1.0.0 what i download from github relases.

Best Regard

Ruiliang.Wang

Hello,Jason It help me a lot .I am using OpenFAST-1.0.0.Recently I am trying to recompiling OpenFAST by VS2013 and IVF2013.I do nothing changed,But error happened like below 错误 27 error PRJ0019: A tool returned an error code from "Running Registry for InflowWind" Project 错误 28 error #7002:...

hello,Jason I have a problem about the prebent blade.I want to calculate the long prebent blade in my FAST model,I want to use the BeamDyn originally,but the convergence problem occured when i use the beamdyn,I have to give up the beamdyn option,I choose the ElastDyn to calcualte the blade dynamic. ...

Dear Jason, When I read the paper "Dynamic modeling and loads analysis of an offshore floating wind turbine",I found you set the damping ratio to 5% critical, The driveshaft was taken to have the same natural frequency as the RECOFF turbine model and a structural-damping ratio—associated w...

Dear Jason, The torsion stiffness of the dirvetrain mainly included the low speed shaft ,gearbox, flexible support and so on,I think the stiffness of the gearbox is the most importrant part, but i don't know how we set the damping, we set the damping of tower and blades by the damping ratio, Do driv...

Dear Jason, I have a problem about BModes.I am using the FASTv7 to build my model, so I use the BModes to calculte the tower modes and compared with the GH Bladed's result like below: Modes.png I want to know why there is so big difference in two software when the frequency become bigger,and if I ch...

Dear Jason, When I use FAST to built the WT model,I am confused about the Nacelle Mass in double-feed and direct-drive WT. As we know,In Double-Feed WT,the generator is included in the Nacelle, but in Direct-Drive WT,the generator is not included in Nacelle. In the FAST,no matter what kind of turbin...