Dynamic response of floating substructure of spar-type offshore wind turbine with catenary mooring cables

• Published in: Ocean engineering Vol. 72; pp. 356 - 364
• Main Authors: Jeon, S.H., Cho, Y.U., Seo, M.W., Cho, J.R., Jeong, W.B.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2013; Elsevier
• Subjects: Applied sciences; Buildings. Public works; Cables; Computer simulation; Dynamic response; Exact sciences and technology; Floating offshore wind turbine; Floating substructure; Fluid–rigid body interaction; Hydraulic constructions; Mooring; Mooring cable; Offshore; Offshore engineering; Offshore structure (platforms, tanks, etc.); Rigid-body dynamics; Substructures; Wave model; Wind turbines; Dynamic response; Wave model; Floating offshore wind turbine; Fluid–rigid body interaction; Floating substructure; Mooring cable; Rigid bodies; Wave effect; Floating structure; Wind generator; Fluid structure interaction; Substructure; Modeling; Fluid-rigid body interaction; Mooring system; Offshore structure
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2013.07.017

The station keeping and the rotational oscillation control are important to secure the dynamic stability of spar-type floating offshore wind turbine subject to irregular wind and wave excitations. Those are usually evaluated in terms of rigid body dynamic response of floating substructure which supports whole offshore wind turbine. In this context, this paper addresses the numerical investigation of dynamic response of a spar-type hollow cylindrical floating substructure moored by three catenary cables to irregular wave excitation. The upper part of wind turbine above wind tower is simplified as a lumped mass and the incompressible irregular potential wave flow is generated according to the Pierson–Moskowitz spectrum. The wave-floating substructure and wave-mooring cable interactions are simulated by coupling BEM and FEM in the staggered iterative manner. Through the numerical experiments, the time- and frequency-responses of a rigid spar-type hollow cylindrical floating substructure and the tension of mooring cables are investigated with respect to the total length and the connection position of mooring cables. •Wave-induced dynamic responses of moored spar floating substructure are investigated.•Wave-substructure-mooring cable interaction is simulated by coupled BEM–FEM methods.•Effects of the total length and connection position of mooring cables are investigated.•The appropriate cable length and connection position are obtained.