The Spatial Configuration Analysis And The Fluid-structure Coupling Mechanics Analysis Of The Hose In Deep-ocean Mining System

During the deep ocean mining process, it should make the hose in proper spatial configuration and ensure the hose meet the strength requirements. This paper makes a study of the deep mining hose, by the theoretical analysis and numeral calculation, this paper analyzes the hose’s initial spatial configuration and its fluid-solid coupling mechanical characteristics. At last, this paper verifies the results of the finite element analysis of the hose’s initial spatial configuration by experimental study.The research contents and conclusions are as follows:(1) Analysis of the hose’s the initial spatial configurationWith the employment of3D nonlinear finite element method, in consideration of the complicated loading function of the hose and the effects of other factors (including buoyancy block layout scheme, the buoyancy, the horizontal distance between the collector and the intermediate bin, the buoyancy ratio of the concentrated buoyancy block), a finite element analysis model is established to find the solution to the hose’s underwater space configuration. The results show that:the inappropriate layout of the buoyancy blocks makes it impossible for the hose to be completely suspended in the seawater. This paper suggests that the buoyancy blocks should be evenly distributed and the buoyancy must be controlled in a certain range (such as1G<F<1.5G).(2) The mechanical analysis of the hose in consideration of the fluid-solid coupling of the internal flow and the external flowBased on the three-dimensional fluid-solid coupling finite element model, the iterative calculation is conducted on the fluid-solid coupling interface to realize fluid-solid coupling. The movement and the mechanical properties of the lifting hose are studied and the regular effects of the factors such as internal fluid parameters, elastic modulus, fluid velocity, the hose pipe diameter, external current flow velocity are analyzed to lay the foundation for finding the best hose conveying program.(3) Experimental study of the hose’s initial spatial configuration A test device platform of the hose’s spatial configuration is designed. By comparing the test results with those of the finite element calculation of the hose’s space configuration, it proves that the initial configuration of static finite element simulation analysis method is correct.