Modes of response of an offshore wind turbine with directional wind and waves

A coupled dynamic analysis of a floating wind turbine system has been performed to investigate effect of wave direction relative to wind on the system. Hydrodynamic loads are calculated by linear frequency domain approach and aerodynamic effect is taken into account by increasing hydrodynamic dampin...

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Bibliographic Details
Published in:Renewable energy 2013-01, Vol.49, p.151-155
Main Authors: Philippe, M., Babarit, A., Ferrant, P.
Format: Article
Language:English
Subjects:
Aerodynamics
Applied sciences
Dynamical systems
Dynamics
Energy
Exact sciences and technology
Floating offshore wind turbine
Fluid mechanics
Frequency domains
Hydrodynamics
Linear frequency domain response
Mechanics
Modal analysis
Natural energy
Offshore
Physics
Renewable energy
Wind turbines
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Summary:A coupled dynamic analysis of a floating wind turbine system has been performed to investigate effect of wave direction relative to wind on the system. Hydrodynamic loads are calculated by linear frequency domain approach and aerodynamic effect is taken into account by increasing hydrodynamic damping and restoring matrices with aerodynamic damping and gyroscopic stiffness. A modal analysis of the system was made to explain the calculated motions. It brings out the natural frequencies, natural modes and modal damping coefficients of the system. Excitation of natural modes, by waves explains the motion observed in the response amplitude operators, and the effect of wave direction relative to wind. This modal analysis helps to better understand the behaviour of floating wind turbine systems.
ISSN:0960-1481
1879-0682
DOI:10.1016/j.renene.2012.01.042