Deep-sea Mining System Laying The Hydrodynamic Calculation And Simulation Of The Recycling Process

According to the present study, the tracked miner and hydraulic lifting riser system are applied by deep sea mining system of China; the deployment of mining system before mining and retrieval of mining system after mining is the premise for successfully mining. The deployment and retrieval of mining system are significantly affected by ocean environment, thus it is essential to consider the ocean load on mining system and calculate the hydraulic forces.Programs which are based on panel method are applied to calculate the added mass and coefficient of any three-dimensional objects, aimed at the hydraulic forces of the deep sea mining system between the process of development and retrieval, and the precision of the programs are verified through thesis and experiment. Added mass and added mass coefficient of principle components of mining system are calculated using the program forgoing. The Virtual Prototype Model of the deployment and retrieval of miner is built, and the effect of deploying velocity and recovering velocity on flexible riser is also discussed, and the suggested value of deploying velocity and safety factor are presented.The main works of this paper are following:1. The components of ocean load in the process of deployment and retrieval of mining system are analyzed, the results indicate that the hydraulic forces exert rather apparent influence on the vertical motion and force condition, thus the importance of calculation of hydraulic force and effect of hydraulic force is obvious; the concepts of added mass and added mass force are applied to express the hydrodynamic force of mining system.2. Two different programs which are based on panel method and potential flow theory are applied to calculate the added mass and coefficient, and the programs are validated, the two methods are also compared by sample analysis; the experiment system for measuring added mass of cuboids is designed; the results of experiment indicate that the precision of added mass calculation result got by Surface Panel Method can be satisfied for wants. 3. 3D model of principle components of mining system, including tracked miner, intermediate station, riser and lifting pump, is built and meshed, a numerical scheme is applied to calculate the added mass coefficient of the above-mentioned components in three translational dimensions.4. The software ADAMS is applied to build the Virtual Prototype Model of the deployment and retrieval of miner, the simulation results indicate that in the process of deployment and retrieval, the hydraulic force exert rather important influence on flexible riser. The effect of deploying velocity and recovering velocity on flexible riser is also discussed, and the suggested value of deploying velocity and safety factor to design the pipe are presented.