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With the development of ocean energy exploration, reliable semi-submersible platforms with very small motion are expected to develop. Especially, in a floating offshore wind turbine system, the maximu...m pitching amplitude is required to be less than a few degrees. To reduce wave-induced pitch motion, a new type semi-submersible with suspensions and a design method of the suspension coefficients are presented. In practical case, an add-on wave energy dissipation device mounted on a floating platform, such as the combined wavewind energy converter system, could be regarded as the suspension system. In this study, firstly, the conceptual semisubmersible is described. Then, the hydrodynamic loads to the semi-submersible are linearized so that the whole system is expressed by a state-space model. The suspension design problem is transformed into solving a constrained H[infinity] optimization problem, which after all is the optimal controller design of a feedback system. Finally, numerical examples are performed to verify the effectiveness of the design. The results illustrate that the pitch motion of the semi-submersible can be remarkably reduced by the designed suspensions.続きを見る
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