Search found 10 matches

by Marvin.Goetzke
Fri Jul 17, 2020 4:07 am
Forum: Structural Analysis
Topic: Simulations using BeamDyn
Replies: 5
Views: 680

Re: Simulations using BeamDyn

Hi Jason, The model for the presented comparison, still includes pre-bending (kp_xr). But the pre-bend is a smoothed curve. I actually use the same values in the models even so the axis in BeamDyn and Bladed is curved. Could you give me a hint on how to convert the stiffnesses correctly for the curv...
by Marvin.Goetzke
Wed Jul 15, 2020 12:22 am
Forum: Structural Analysis
Topic: Simulations using BeamDyn
Replies: 5
Views: 680

Re: Simulations using BeamDyn

Hi Jason, Thanks for the quick response. I double checked the blade mass and moments of mass. The difference between BeamDyn and Bladed is below 0.2 %. ElastoDyn has differences in mass and center of gravity up to 2 % (do to interpolated values), mass moments fit well. So this shouldn't be a problem...
by Marvin.Goetzke
Tue Jul 14, 2020 7:20 am
Forum: Structural Analysis
Topic: Simulations using BeamDyn
Replies: 5
Views: 680

Simulations using BeamDyn

Hi all, I currently have troubles with creating a correct BeamDyn Blade model. I run a comparison between OpenFAST (Ver. 2.2.0) and GH Bladed 4.8 (using multi-part blade). My baseline model is the Bladed model which has 5 blade parts. I disabled all flexibility besides blades and have fixed pitch an...
by Marvin.Goetzke
Mon Mar 09, 2020 3:21 am
Forum: Controls
Topic: Thrust regulated turbine control in OpenFAST
Replies: 1
Views: 735

Thrust regulated turbine control in OpenFAST

Hi all, I use OpenFAST v2.2.0 with a Bladed-style DLL. The controller shall use the turbines thrust forces as an input sensor. Therefore, I have set Record 79 "Request for Loads" to 3. Now I expected that I could use Record 110 "Hub Fixed Fx" as an input, but the controller DLL s...
by Marvin.Goetzke
Thu Feb 13, 2020 1:12 am
Forum: Computer-Aided Engineering Software Tools
Topic: openFAST v2.2.0 binearies
Replies: 14
Views: 2141

Re: openFAST v2.2.0 binearies

Hi Rafael,

Thanks for the quick fix. Always nice to have a supportive community like this.

Best Regards,
Marvin
by Marvin.Goetzke
Mon Feb 10, 2020 3:29 am
Forum: Computer-Aided Engineering Software Tools
Topic: openFAST v2.2.0 binearies
Replies: 14
Views: 2141

Re: openFAST v2.2.0 binearies

Hi NREL Team, hi Ebert, I just downloaded the openFAST v2.2.0 binaries from GitHub. After some troubles to get it running, I recognized that openfast_Win32.exe is actually a 64-bit version. This might also be the reason for Ebert's problems. Since I also have a 32-bit Controller-DLL, I would appreci...
by Marvin.Goetzke
Wed Jul 17, 2019 5:02 am
Forum: Controls
Topic: (measured) Pitch Angle differs to demanded pitch angle
Replies: 2
Views: 2058

Re: (measured) Pitch Angle differs to demanded pitch angle

Hi Jason,

Thanks for the information. The first approach works perfectly for me. Now the commanded and the actual pitch angle is identical.

Best Regards,
Marvin
by Marvin.Goetzke
Mon Jul 08, 2019 7:07 am
Forum: Controls
Topic: (measured) Pitch Angle differs to demanded pitch angle
Replies: 2
Views: 2058

(measured) Pitch Angle differs to demanded pitch angle

Hi, I have some trouble with the pitch behavior in openFASTv1. As far as I understand the (measured/actual) pitch angle should be the same as the demanded pitch angle. In my case the actual pitch angle oscillates around the demanded pitch angle. As background knowledge to my problem might be said, t...
by Marvin.Goetzke
Tue Apr 30, 2019 5:46 am
Forum: Controls
Topic: HSS brake implementation within a DLL
Replies: 5
Views: 2922

Re: HSS brake implementation within a DLL

Hi Jason,

Thanks for the quick response. I actually used OpenFAST v1 until now. I will check it with the latest version. Is avrSWAP[107] now always used, when the Brake is activated by the DLL? Or do I need to change avrSWAP[36] as well?

Best Regards,
Marvin Goetzke
by Marvin.Goetzke
Mon Apr 29, 2019 3:21 am
Forum: Controls
Topic: HSS brake implementation within a DLL
Replies: 5
Views: 2922

Re: HSS brake implementation within a DLL

Hi, As far as I get it, the avrSwap(36) only activates or deactivates the brake. But this means the defined braking torque is applied instantly. I tried to use the avrSwap(107) to define a ramp up of the braking torque. But it doesn't worked, as the Record 107 is not read by the subroutine Retrieve_...

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