Utilization of a very large mobile offshore structure for clean energy conversion

We proposed a new design concepts of a very large floating structure with thrusters (we call it VLMOS; Very Large Mobile Offshore Structure) that is utilized as a carrier of the renewable energy plant In order to get good mobility, VLMOS has a configuration that a broad deck is supported by many slender lower hulls and vertical columns. Green function for hydroelastic analysis of vibrating free-free plates by Eatock Taylor and Ohkus is used for representing the elastic motion of the deck and the conventional modal analysis and the three-dimensional boundary element method are employed for the hydroelastic analysis of the lower hull. Some numerical results suggest that the deformation of the deck is relatively large in beam seas. A system for reducing the deformation is considered. The system reduces the deformation and generates electrical power at the same time. A two-dimensional model is used to analyze the system.