Theoretical and numerical investigations on an integrated sea-wave-floating wind turbine energy harvesting system

Abstract

This paper provides a type of floating wind-turbine to reduce vibrations excited by sea-waves and to collect wave-energy. The idea is to partly-replace some passive-dampers in current floating-wind-turbines by electromagnetic-isolators to reach the aim. The theoretical analysis and the solution of system are presented, based on which the numerical calculations for dynamic response-curves are given. The results show the proposed system is effective to reduce vibrations of floating wind turbine excited by sea-waves and to collect wave energy for it safely to operate in sea-environments. It is found that due to interactions and water added mass, the pre-designed same frequency of floating-turbine and electromagnetic-isolator as a dynamic absorber is separated, of which the lower frequency about 0.75 is the floating turbine one affected by the water added mass. The numerical results at frequency 0.75 with varying electromagnetic damping values reveal that the best damping 0.15 of electromagnetic isolator with the energy collection rate of constant 0.95. Some guidelines for possible practical design of this type of integrated system by using the developed theory are suggested, which would be an important reference for practical designs. A discussion is given for possible research directions on this integrated floating wave-wind harvesting system.

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Identifiers

ORCID for Jing Tang Xing: orcid.org/0000-0003-3992-5265

ORCID for Dominic Hudson: orcid.org/0000-0002-2012-6255

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