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FEM modeling for 3D dynamic analysis of deep-ocean mining pipeline and its experimental verification

Journal of Central South University of Technology 2007年第6期14卷 808-813页

作者：王刚刘少军李力 School of Mechanical and Electrical Engineering Central South University

3D dynamic analysis models of 1000 m deep-ocean mining pipeline, including steel lift pipe, pump, buffer and flexible hose, were established by finite element method (FEM). The coupling effect of steel lift pipe and flexible hose, and main external loads of pipeline were considered in the models, such as gravity, buoyancy, hydrodynamic forces, internal and external fluid pressures, concentrated suspension buoyancy on the flexible hose, torsional moment and axial force induced by pump working. Some relevant FEM models and solution techniques were developed, according to various 3D transient behaviors of integrated deep-ocean mining pipeline, including towing motions of track-keeping operation and launch process of pipeline. Meanwhile, an experimental verification system in towing water tank that had similar characteristics of designed mining pipeline was developed to verify the accuracy of the FEM models and dynamic simulation. The experiment results show that the experimental records and simulation results of stress of pipe are coincided. Based on the further simulations of 1 000 m deep-ocean mining pipeline, the simulation results show that, to form configuration of a saddle shape, the total concentrated suspension buoyancy of flexible hose should be 95%?105% of the gravity of flexible hose in water, the first suspension point occupies 1/3 of the total buoyancy, and the second suspension point occupies 2/3 of the total buoyancy. When towing velocity of mining system is less than 0.5 m/s, the towing track of buffer is coincided with the setting route of ship on the whole and the configuration of flexible hose is also kept well.

关键词： deep-ocean mining pipeline modeling dynamic analysis finite element method

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维普期刊数据库

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Dynamics of vertical pipe in deep-ocean mining system

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Journal of Central South University of Technology 2007年第4期14卷 552-556页

作者：禹宏云刘少军 School of Mechanical and Electrical Engineering Central South University

A 3-D geometrical nonlinear model for the entire lift system of 1000-m sea trial system of China ocean Mineral Resources R&D Association was established with finite element *** model was utilized to analyze the dynamic characteristics of the vertical pipe under the influence of moving velocity,current direction and *** simulation results show that the axial stress is dominant on the vertical pipe,its maximum is located at the pipe top,all stresses are much less than the allowable value of the vertical pipe and joint;the heave motion leads to violent fluctuation of the force and stress,but a period of 8 s is not likely to resonate the present pipe;against the current,0.50 m/s is the suggested moving velocity of the ship and miner,while along the current,the moving velocity can be slightly higher than 0.75 m/s.

关键词： deep-ocean mining dynamics vertical pipe finite element method geometrical nonlinearity

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维普期刊数据库

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Fluid-solid interaction of resistance loss of flexible hose in deep ocean mining

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Journal of Central South University 2012年第11期19卷 3188-3193页

作者：王志饶秋华刘少军 Schools of Mechanics & Engineering Science Zhengzhou University School of Civil Engineering Central South University School of Mechanical and Electrical Engineering Central South University

The resistance loss of transportation was studied and the influences of buoyancy layout,mineral content and elastic modulus of flexible hose were investigated based on three-dimensional finite element model of fluid-solid interaction by ***/MENTAT *** numerical results show that the resistance losses increase with the increase of mineral content Cv and velocity of internal fluid v and decrease with the increase of elastic modulus E of flexible *** buoyancy layout and the velocity of internal fluid have greater impacts on the resistance losses than the elastic modulus of flexible *** order to reduce the resistance losses and improve the efficiency of the deep-ocean mining,Cv and v must be restricted in a suitable range (e.g.10%-25% and 2.5-4 m/s).Effective buoyancy layout (such as Scheme C and D) should be adopted and the suitable material of moderate E should be used for the flexible hose in deep-ocean mining.

关键词： resistance loss flexible hose fluid-solid interaction deep-ocean mining finite element method

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维普期刊数据库

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Suspension principle of deep-ocean nodule collector

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Journal of Central South University 2014年第3期21卷 920-925页

作者：郑皓刘少军胡琼 School of Mechanical and Electrical Engineering Central South University State Key Laboratory of deep Sea Mineral Resources Development and Utilization Technology(Changsha Research Institute of mining and Metallurgy)

To make sure that the nodule collector can walk on the soft sediments of seafloor effectively, suspension principle of deep-ocean nodule collector is proposed. The supporting and driving mechanisms are separated to avoid collector sinking. The supporting mechanism is a streamlined body with large and smooth supporting area. The grounding pressure is reduced to 0.5- 1 N/cm2 to make sure that the sinkage is limited. The impellers serve as the driving mechanism to supply enough driving power. The position between the supporting mechanism and the driving mechanism can be adjusted according to the operating condition to decrease the walking resistance and to increase driving efficiency. The test results indicate that the collector can walk on the surface of the soft sediments with the limited sinkage. The traction forces were up to 800 kg and the sinkage of the impeller was under the limitation.

关键词： deep-ocean mining suspension principle nodule collector sinking

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