Fluid-solid coupled dynamical response of a 1000m deep-ocean mining system is studied based on nonlinear finite element method with fluidsolid coupling model using. Finite element software MSC.MARC 2005 is adopted to calculate displacements, support constrained forces and stresses of the mining system. Effects of the towing velocity of the mining ship and the mining machine, wave period and nodule mass stored in the buffer on dynamic responses of the mining system are analyzed in order to provide scientific basis for optimal design of the deep-ocean mining system. Research results show that for safety and efficiency of the mining operation, the velocity of the mining machine and the nodule mass should be limited within appropriate ranges (about 0.3–0.5m/s and 2000–4000kg) and the countercurrent mining operation should be avoided in the case of smaller wave period.


With the rapid development of science technology and the gradual exhaustion of land resources, governments in different countries are becoming more aware that exploitation of ocean resource will be main strategic tasks of countries in 21st century and very importance for national interests of global ocean. Current research on the deep-ocean mining system is mainly focused on static and dynamic analyses of the rigid pipe or flexible hose independently. Although geometrical nonlinear static and dynamic responses of the rigid pipe with free-hanging bottom end were studied by finite element method (Chung,1978; Chung and Felippa,1981; Chung,1981; Chung and Whitney,1981,1993) and results showed that large transversal and axial vibrations of the rigid pipe leading to difficulty in control of the mining system could be greatly decreased by damping system (Cheng and Chung,1995, 1997), towing effect of the flexible hose on the rigid pipe and coupling effect of inner fluid on the rigid pipe were not taken into account.

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