Based on the time-domain coupling analysis method,a three-dimensional nonlinear hydrodynamic model for mother vessel,deep-sea mining equipment and umbilical cable was established,and numerical calculation and analysis were also conducted for the hydrodynamic response characteristics of umbilical cable during launch and recovery.The results show that deep-sea mining equipment(weighing 10 t in water)can be safely launched and recovered at a speed of 0.8 m/s under condition of sea state 4.Due to the influence of both waves and currents,the deep-sea mining equipment will have strong oscillations and swings at the beginning of launch and at the end of recovery,which can be reduced by installing anti-swaying devices.
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