Abstract
In deep-sea mining, the coupling dynamic response between the mining vessel and the lifting pipe is a significant problem, which directly affects the structural design of the lifting system and the safety of field operation. The characteristics of coupled motion model have not been fully considered in the existing research. Therefore, this paper uses time-domain coupled numerical model as the research object, considering ocean current, surface wave, pipe dynamics and vessel-pipe contact mechanics, to study the dynamic behavior of the lifting pipe and mining vessel during the process of deep-sea mining using AQWA and OrcaFlex softwares. The response amplitude operator (RAO) is used to compare the measured and simulations dynamic response of the mining vessel. There is a very good agreement in RAO between the experiments and simulations. The coupling simulation results show that the coupling effect has a significant effect on the time domain dynamic response of the lifting pipe, but has little effect on the average effective tension and longitudinal amplitude along the pipe length. The research results of this paper are of great significance to the safety design of deep-sea mining lifting system and the planning of deep-sea operation activities.
Highlights
In deep-sea mining, the coupling dynamic response between the mining vessel and the lifting pipe is a significant problem, which directly affects the structural design of the lifting system and the safety of field operation
Based on Morison’s equations, lumped mass method and three-dimensional potential flow theory, Sun et al.[17] proposed a method of coupled vessel/riser/body system in deep sea mining combined with dynamic positioning (DP), and obtained the time domain simulation result of the vessel operated in two DP modes
On the premise that roll can be completely compensated by heave compensation device, this paper studies the longitudinal coupling dynamic characteristics of deep sea mining vessel and lifting pipe
Summary
In the hydrodynamic model experiment of deep-sea mining vessel, the motion and force under the action of waves are mainly considered. The coupling experiment of deep-sea mining vessel and lifting pipe was carried out at the National Offshore Technology Center (TianJin, China). According to the size of experimental pool, the experimental model of deep-sea mining system is a 1:80-scale prototype. The motion of the mining vessel in any space has 6 degrees of freedom (6-DOF), and the attitude information of the mining vessel is collected by three optical cameras, and the pull
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