Deep-sea Mining Systems Lifting Pipe To Test The Research And Application Of The Hydrodynamic Coefficients

Deep seabed mining system movement and dynamic analysis mainly works in two aspects: one is investigating the fluid dynamic forces of deep seabed mining system's pipe and tubes, the other is investigating the pipe and tubes f~ non-linear. 4 large displacement and small transformation. The paper mainly discusses the fluid dynamic coefficients research and the displacement and stress in static state and constant fluid of the pipe (simplified the column with small tubes), which bases on the above work. Fluid dynamic forces acting on the column with small tubes is resistance , inertia force, lift force and torsion. Inertia force has been obtained its expression in theory ~ while the paper utilizes the Newman method [15] to deduce the expression of the body 憇 non-constant movement in non-constant surface flow. To choose suitable fluid dynamic coefficients of the column with small tubes in ocean current and wave, the paper applies experiment method. The experiment data utilizes interpolation method to establish the fluid dynamic coefficients database of the column with one, two and three small tubes. The paper analysis displacement and stress of column with small tubes in static state and constant current: fluid dynamic coefficients of the column with small tubes can be obtained from the database that has been established; the calculation in structure applies non-linear FEM flow coordinate iteration method.