An Accurate Estimation of the Eigenfrequency of an Offshore Wind Turbine Considered as the Stepped Euler-Bernoulli Beam in Three-Spring Flexible Foundation Using the Power Series Method

Table 4

Comparison of case 3 data and results from Arany et al. [7].

OWT name	Natural frequency (Hz) and error (%)
	Measured	Case 3	Error	Arany et al. [8]	Error
I Lely A2	0.634	0.727	15.34	0.643	1.36
II Irene Vorrink	0.546	0.603	10.51	0.552-0.555	−1.10
III Blyth	0.488	0.470	−3.60	0.489	0.12
IV Kentish Flats	0.339	0.339	0.01	0.339	0.01
V Barrow	0.369	0.361	−2.08	0.367	−0.54
VI Thanet	0.370	0.351	−5.19	0.382	3.08
VII Belwind	0.372	0.378	1.34	0.380	2.12
VIII Burbo Bank	0.292	0.292	0.07	0.295	1.05
IX Walney	0.350	0.330	−5.68	0.349	−0.40
X Gunfleet Sands	0.314	0.302	−3.82	0.315	0.31
XI ZJU-P	0.262	0.266	1.45