Request 64-bit rosco.dll

[hounan126100]

My goal is to modify the blade pitch gain. I watched Professor Yang Yang's video, which mentioned that the ROSCO controller can be used without compiling a dynamic link library. However, the official website example uses Discon_OC3Hywind.dll. Professor Yang Yang's video states that “Discon_OC3Hywind.dll” requires compiling a dynamic link library, but I'm unsure how to compile it. Therefore, I want to use the ROSCO controller to adjust the blade gain. However, after replacing Discon_OC3Hywind.dll with the ROSCO controller, the program started reporting errors upon execution. I'm uncertain if this is due to an issue with my ROSCO controller, so I am requesting a 64-bit version of rosco.dll.

OpenFAST Error Message"FAST_InitializeAll:SrvD_Init:BladedInterface_Init:The dynamic library
.\ServoData1/DISCON_ROSCO_x64.dll could not be loaded. Check that the file exists in the
specified location and that it is compiled for 64-bit applications."

[gatosardina]

You can find precompiled controller binaries in the releases https://github.com/OpenFAST/openfast/releases

You can also find a precompiled ROSCO binary in the ROSCO repository releases https://github.com/NREL/ROSCO/releases

I'm not sure where did you download that rosco binary from, or why would openfast fail to load it

[jjonkman]

Dear @hounan126100,

Just a couple comments adding to @gatosardina's response, which I agree with:

• The DISCON_OC3Hywind.dll is provided in the OpenFAST release. This is the baseline controller for the NREL 5-MW baseline turbine atop the OC3-Hywind spar, but this controller is different than ROSCO.
• When you use ROSCO, is your DISCON_ROSCO_x64.dll located in the directory you specified (that is, directory ServoData1 relative to where you are running your OpenFAST simulation from)?

Best regards,