Regarding the use of FAST, MBC3 and CampbellDiagram, I list the steps below since I still cannot distinguish the modes of 2nd Tower Fore-Aft and Side-to-Side from blades modes. Please once again help me to check.
-
I turned on 13 DoFs in .fst input and simulated it using FAST-Linearization. I got the output .lin file after simulation.
-
I downloaded MBC3 codes from wind.nrel.gov/designcodes/postpr … mbc/alpha/ and I copied the six .m file from the MBC/Source to the .lin location.
-
I opened MATLAB and located to .lin file. I commanded GetMats in MATLAB command window, and then I command the name of .lin file, and then mbc3.
-
After that, I open CampbellDiagram.xls Eigenanalysis FAST - #2 by Jason.Jonkman I copied DescStates, MBC_ModeShapeMagnitude, MBC_ModeShapePhaseDeg, MBC_DampingRatio, MBC_DampedFrequencyHz, MBC_NaturalFrequencyHz from MATLAB MBC3 outputs respectively to the 6 gray cells marked with comments. The Scaling inputs were set as 1. And I did not change other cells.
-
There are 13 columns and 13 rows containing the information of Natural Frequencies, Magnitude and Phase in my sheet since my model owns 13 DoFs. Each column owns two sub-columns – Magnitude and Phase. In each column of the 13s, there is one row being red bolded which is used for me to interpret the associated mode (correlate with the column – States) with the Natural (Undamped) Frequency showing in the top of the column.
I have attached the CampbellDiagram.xls once again. Thank you so much about that!
CampbellDiagram.xls (256 KB)