I am studying on the seismic responses of the onshore wind turbine. I am trying to use FAST v.7 to model a gravity foundation wind turbine. I use SR model. I have following questions
- According to Seismic Loading for FAST report in 2011, it stated that in FAST v.7 it is assumed that the turbine base does not rotate about any of three axes. So, it means that I need to modify the code in order to create SR model in FAST v.7. Am I right?
- I would like to consider higher vibration modes in FAST v.7. How can I do that? I saw that FAST can input the tower mode shape up to the 2nd tower mode shapes.The reason is that I am studying on the effect of the higher tower vibration modes on the shear response at the foundation.