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Based on the flow induced motion energy conversion system, the combined triangular prisms with the section form and stiffness as variables to evaluate the amplitude, frequency and other indicators was studied. The combined triangular prisms were selected for model test, as well as the influence of arrangement and stiffness on the combined triangular prisms were studied by changing the arrangement of the prisms and system stiffness. The aim is to explore the optimal condition for flow induced motion of the three triangular prisms in different arrangements, and to expand ideas for subsequent research on flow induced motion of multiple oscillators. The experimental results show that all the combined triangular prisms have good performance with different stiffness. Both the motion of type I prism and type III prism perform typical vortex induced vibration with the increase of flow velocity, the type I prism has the best performance. [ABSTRACT FROM AUTHOR]

The allowable differential air pressure in compartments of composite bucket foundation is of great significance for its safe transportation. For the problem of the allowable differential air pressure during floating transportation of composite bucket foundation, taking the floating project of composite bucket foundation in an offshore wind power project as the background, the influence of the allowable differential air pressure of composite bucket foundation with the change of parameters such as external draft and diameter of composite bucket foundation, the bulkhead thickness, and air pressure in compartments were quantitatively analyzed based on finite element software ABAQUS. The results show that: the maximum allowable differential air pressure increases exponentially with the increase of draft and bulkhead thickness. But the maximum allowable differential air pressure on bulkheads is more sensitive to the change of draft, rather than bulkhead thickness. The addition of reinforcing ribs to the bulkheads has a significant increase of 20% ~ 35% in the maximum allowable differential air pressure of composite bucket foundation. For a specific maximum allowable differential air pressure, the optimal solution in the safe combination of the variation parameters of foundation can be selected according to the actual engineering needs. [ABSTRACT FROM AUTHOR]