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 2

Characteristics of the ZJU-P offshore wind turbine.

Wind parameters	Symbols	Units	ZJU-P ()
(1) Rotor-nacelle assembly mass		Ton	218.28
(2) Total height of wind turbine		m	106.67
(3) Tower bottom diameter		m	3.16
(4) Tower top diameter		m	5.5
(5) Tower Young’s modulus		GPa	210
(6) First part height		m	28
(7) Tower wall thickness		mm	75
(8) Monopile diameter		m	5.5
(9) Monopile wall thickness		mm	75
(10) Monopile Young’s modulus		GPa	210
(11) Lateral stiffness of foundation		GN/m	0.206
(12) Cross-stiffness of foundation		GN	−3.08
(13) Rotational stiffness of foundation		GNm/rad	83.3