Monopile Foundation Stiffness Estimation of an Instrumented Offshore Wind Turbine through Model Updating

Figure 5

Identified stable modes over all idling datasets. Interpreted tower dominated modes presented with coloured markers and optimised model updated predicted 2^nd tower mode shapes presented with black markers. (a) 1^st–3^rd tower dominated modes. (b) 1^st tower dominated modes. (c) 2^nd tower dominated modes. (d) 3^rd tower dominated modes.

(a)

(b)

(c)

(d)