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作者： Zheng, Hao Liu, Shao-Jun Gan, Hai-Ren Yang, Ning School of Mechanical and Electrical Engineering Central South University Changsha 410083 China State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology Changsha Research Institute of Mining and Metallurgy Changsha 410012 China

ISBN: (纸本)9783038351382

The cutting processes of drill rod under different surge pressures, rotate pressures and propulsion forces were recorded by the high-speed camera in the hydraulic percussive rotary cutting tests of deep-ocean cobalt-rich crusts. Meanwhile, the curves of impact vibration, torsional vibration and frame vibration during the cutting processes were plotted by digital picture processing technique. The impact frequency, torsional vibration frequency, torsional vibration amplitude, vibration amplitude of drill rod and the frame were calculated. The photogrammetry results are generally in agreement with the traditional test results. High-speed photogrammetry is a non-contact, wide range application, and high precision measurement, and the cutting process can be described visually and adequately. © (2014) Trans Tech Publications, Switzerland.

关键词： High speed cameras

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Experimental study on optimum transport velocity for deep-sea mining pipeline transportation 26

Experimental study on optimum transport velocity for deep-se...

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26th Annual International Ocean and Polar Engineering Conference, ISOPE 2016

作者： Xiao, Hong Liu, Yuwei Tang, Dasheng Li, Xiaoyan State Key Laboratory of Exploitation and Utilization of Deep Sea Mineral Resources Changsha Research Institute of Mining and Metallurgy Co. Ltd. Changsha Hunan China

ISBN: (纸本)9781880653883

On the stage of pre commercial exploitation, the safety and economic cost become the main research content in the study of deep-sea mining pipeline transportation technical. The laboratory has been established to study on the deep-sea mining pipeline transportation for a long time. Based on the results of these research, the experimental study of different particle size and concentrations for artificial manganese nodules had been carried out in the test system. The following conclusions were obtained. 1. Resistance loss in different particle size and concentration, 2. The best ratio of particle size and concentration, 3. The Empirical formula of the optimal transport velocity. © Copyright 2016 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Particle size

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Finite element analysis on chassis of tracked test vehicle

Finite element analysis on chassis of tracked test vehicle

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2012 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring, CDCIEM 2012

作者： Wang, Guoqing Liu, Shaojun Zeng, Yihui Chen, Lingping College of Mechanical and Electrical Engineering Central South University Changsha 410083 China State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology China SANY Heavy Industry Co. Ltd. China

ISBN: (纸本)9780769546391

Chassis is one of the key components of tracked test vehicle. The strength and rigidity of chassis must be considered and structure resonance should be avoided during the process of structure design. The stress nephogram and strain nephogram of chassis are obtained, after static analysis in the finite element analysis software ANSYS. The maximum stress is 65.13MPa and the maximum strain is *** both occur in the place where stiffener of bottom plate and side plate of speed reducer box are welded together. A kind of improved scheme is put forward, considering that the welding allowable stress is smaller than the allowable stress of parent material, and also the stress concentration and residual welding stress exist,though the maximum stress is in the allowed range. Static analysis is made to the improved chassis. The maximum stress becomes 45. 573MPa with 30% reduced, and the maximum strain becomes 0.00022786mm with 28.8% reduced. And the position of maximum stress and maximum strain transfer to the internal corner of crossbeam. And the first six extended natural frequencies of the improved chassis are obtained via modal analysis. © 2012 IEEE.

关键词： Finite element method

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On electro-acoustic characteristics of a marine broadband sparker for seismic exploration

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Journal of Oceanology and Limnology 2024年第3期42卷 760-771页

作者： Jing LI Kai LIU Liancheng ZHANG Chenguang LIU Yanliang PEI Baohua LIU Key Laboratory of Marine Geology and Metallogency First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory of Marine Geology Laoshan LaboratoryQingdao 266237China Key Laboratory of Fluid Transmission Technology of Zhejiang Province Zhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory of Submarine Acoustic Investigation and Application of Qingdao(Preparatory) Qingdao 266061China Key Laboratory of Deep Sea Mineral Resources Development Shandong(Preparatory)Qingdao 266061China

The construction of major marine infrastructure projects and the exploration and development of deep-sea mineral resources require fine imaging of seabed strata and *** highresolution marine seismic exploration based on a high broadband sparker source is an important approach to reveal seabed stratum and reservoir structure,and identify *** optimize the performance of sparker seismic source,we investigated the electro-acoustic characteristics of spark discharge under conditions of different charging voltages and electrode *** show that the sound source level increased with the increase of the charging voltage,whereas the main frequency decreased when the charging voltage *** addition,it was found that the charging capacitance had more obvious influence on the main frequency than the sound source level *** the load energy decreased with increasing electrode number,the sound source level still increased but the main frequency ***,the primary to bubble(P/B)ratio increased with the increase of the electrode *** gain a deeper insight into the electro-acoustic characteristics,we investigate the relationship between sound source level and power peak,from which a good correlation was observed.A more practical statistical analysis on the rise rate of current was processed,and a perfect logarithmic function was ***,we found that the main frequency was most possibly subjected to the electrical energy,especially the charging energy per *** results indicate that the charging energy per electrode less than 10 J could increase the main frequency to above 300 *** last,the main frequency could be reduced to 20 Hz when the charging energy of a single-electrode discharge was enhanced to over 4 *** study shall be helpful in developing a sparker seismic source and improving the performance for marine engineering exploration and geohazard assessment.

关键词： high-resolution marine seismic exploration sparker seismic source sound source level main frequency electro-acoustic characteristics

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Nonlinear finite-element analysis of flexible marine pipes for deep-sea mining

Nonlinear finite-element analysis of flexible marine pipes f...

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24th International Ocean and Polar Engineering Conference, ISOPE 2014 Busan

作者： Chen, Yuxiang Yang, Ning Jin, Xing State Key Laboratory of Exploitation and Utilization of Deep Sea Mineral Resources Changsha Research Institute of Mining and Metallurgy Changsha Hunan China College of Mechanical and Electrical Engineering Central South University Changsha Hunan China

ISBN: (纸本)9781880653913

Based on nonlinear finite element method, a quasi-static analysis method that succeeded in finding equilibrium configurations of flexible marine pipes dragged by mining vehicles was adopted and modified in this paper. A verification experiment was introduced and a simulation task for verifying validity and accuracy of this modified method was conducted. Favorable agreements were obtained and simulation results also indicate that the modified method is more accurate than the original one. After verification, a second simulation was conducted, which the mining vehicle moves counter-clock-wise in a circle. Variations of configuration and constraining forces were shown and discussed. Copyright © 2014 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Finite element method

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Establishment of an improved dynamic model of the total deep ocean mining system and its integrated operation simulation

Establishment of an improved dynamic model of the total deep...

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9th ISOPE Ocean Mining and Gas Hydrates Symposium, ISOPE OMS 2011

作者： Dai, Yu Liu, Shaojun Cao, Xiren Li, Yan College of Mechanical and Electrical Engineering Central South University Changsha Hunan China Changsha Research Institute of Mining and Metallurgy State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology Changsha Hunan China College of Civil Engineering Hunan University Changsha Hunan China

ISBN: (纸本)9781880653951

An Improved dynamic model of the total deep ocean mining system is established. The pipeline subsystem is built as a 3D discrete element model, which is divided into 3D rigid elements linked by flexible connectors. The flexible connector without mass is represented by 6 spring-damper elements. The external hydrodynamic forces from the longitudinal and lateral directions are both considered and modeled based on the Morisson formula and applied to the mass center of each discrete rigid element. The seafloor tracked miner is built as a simplified 3D single-body model with 6 degrees of freedom. While the track-terrain interaction is modeled by partitioning the track-terrain interface into a certain number of mesh elements with three mutually perpendicular forces, including the normal force, the longitudinal and the lateral shear forces, acting on the center point of each mesh element. With consideration of the operational safety and collection efficiency, two new moving paths for the miner on the seafloor are proposed, which can be simulated with the newly established single-body dynamic model of the miner. Integrating the discrete element model of the pipeline and the single-body model of the miner, a new improved dynamic model of the total deep ocean mining system is finally formed. Two new mining operation process modes of the total mining system, which combine of the active straight-line and turning motions of the miner and the ship, and of the passive towed motions of the pipeline, are proposed and simulated with the new improved 3D dynamic model. Some critical simulation results are obtained, such as the motion trajectory of each key subsystem during the operation process and the velocities of the buoyancy module, which in a way can provide specific guidance and useful reference for the practical deep ocean mining system analysis, operation and control. Copyright © 2011 by The International Society of Offshore and Polar Engineers (ISOPE).

关键词： Miners

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Research on variably accelerated settling of coarse mineral particles in still water 25

Research on variably accelerated settling of coarse mineral ...

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25th International Ocean and Polar Engineering Conference, ISOPE 2015

作者： Tang, Dasheng Xia, Jianxin Xu, Dehuai Xiao, Hong State Key Laboratory of the Exploration and Utilization of Deep-Sea Mineral Resources Changsha Research Institute of Mining and Metallurgy Co. Ltd. Changsha Hunan China College of Life and Environmental Sciences Minzu University of China Haidian Beijing China

ISBN: (纸本)9781880653890

Research on free settling of coarse mineral particles is very important and fundamental to design of the hydraulic lifting pipe system. Based on mechanical property of coarse particles in fluid, a formula for calculating the settling rate of the coarse mineral particles dropped in still water was obtained, which can be used to reveals general laws of the settling motion of the particles in still water. By considering real working conditions of the lifting pipe system which transport coarse mineral particles in deep sea, settling procedure of coarse mineral particles such as polymetallic nodules, cobalt-rich crusts and hydrothermal sulfide were captured by high speed photography, and diameters of these particles are 10, 20, 30, 40, and 50 mm, separately. By observing the procedure, we found the motion of the particles was transformed to near-uniform motion after a long time. The experimental results confirmed the maximum settling rate and settling distance at the maximum settling rate is related to the diameter of the particles, and got the correlation curves. According to the observational experimental, the relationship between the settling rate and settling time was derived and the relation curves between the settling time and settling distance at the acceleration stage of the settling procedure was also acquired. A comparison between theoretically analyzed results and the experimental data indicated that they were in agreement. Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Sulfur compounds

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The big mantle wedge and decratonic gold deposits

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Science China Earth Sciences 2021年第9期64卷 1451-1462页

作者： Rixiang ZHU Weidong SUN State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China Center of Deep Sea Research Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao266071China School of Marine Sciences University of Chinese Academy of SciencesBeing100049China

The Circum-Pacific subduction zone is a famous gold metallogenic domain in the world,with two important gold metallogenic provinces,the North China Craton and Nevada,which are related to the destruction of the North China Craton and the Wyoming Craton,*** ore-forming fluids were possibly derived from the stagnant slab in the mantle transition *** oceanic lithospheric mantle usually contains serpentine layers up to thousands of meters *** plate subduction,serpentine is dehydrated at depths of<200 km and transformed into high-pressure hydrous minerals,known as Phases A to E,which carries water to the depth of>300 *** overlying big mantle wedge is hydrated during the breakdown of these hydrous facies in the mantle transition *** dehydration of the subducted slab in the big mantle wedge releases sulfur-rich fluid,which extracts gold and other chalcophile elements in the surrounding rocks,forming gold-rich *** the cratonic geotherm is lower than the water-saturated solidus line of lherzolite,the fluid cannot trigger partial ***,it induces metasomatism and forms pargasite and other water-bearing minerals when it migrates upward to depths of less than 100 km in the cratonic lithospheric mantle,resulting in a water-and gold-rich weak *** the destruction of craton,the weak layer is destabilized,releasing gold-bearing fluids that accelerate the *** ore-forming fluids migrate along the shallow weak zone and are accumulated at shallow depths,and subsequently escape along deep faults during major tectonic events,leading to explosive gold *** ore-forming fluids are rich in ferrous iron,which releases hydrogen at low pressure through iron ***,decratonic gold deposits are often reduced deposits.

关键词： Big mantle wedge Serpentine Pargasite Craton destruction Explosive gold mineralization Hydrogen

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Low-field NMR application in the characterization of CO_(2)geological storage and utilization related to shale gas reservoirs:a brief review

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Frontiers of Earth Science 2023年第3期17卷 739-751页

作者： Zhaohui LU Ke LI Xingbing LIU Peng ZHAO Jun LIU National and Local Joint Engineering Research Center of Shale Gas Exploration and Development Chongqing Institute of Geology and Mineral ResourceChongqing 401120China Key Laboratory of Shale Gas Exploration(Ministry of Natural Resources) Chongqing Institute of Geology and Mineral ResourcesChongqing 401120China MOE Key Laboratory of Deep Earth Science and Engineering Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu 610065China State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing 400044China Chongqing Institute of Geological Survey Chongqing 401122China

CO_(2)geological storage and utilization(CGSU)is considered a far-reaching technique to meet the demand of increasing energy supply and decreasing CO_(2)*** CGSUs related to shale gas reservoirs,experimental investigations have attracted variable methodologies,among which low-field NMR(LF-NMR)is a promising method and is playing an increasingly key role in reservoir ***,the application of this nondestructive,sensitive,and quick LF-NMR technique in characterizing CGSU behavior in shale gas reservoirs is ***,the basic principle of LF-NMR for 1H-fluid detection is introduced,which is the theoretical foundation of the reviewed achievements in this ***,the reviewed works are related to the LF-NMR-based measurements of CH_(4)adsorption capacity and the CO_(2)-CH_(4)interaction in shale,as well as the performance on CO_(2)sequestration and simultaneous enhanced gas recovery from ***,the reviewed achievements have exhibited a large potential for LF-NMR application in CGSUs related to shale gas reservoirs,although some limitations and deficiencies still need to be ***,some suggestions are proposed for a more responsible development of the LF-NMR ***,this review is helpful in promoting the expanding application of the LF-NMR technique in CGSU implementation in shale gas reservoirs.

关键词： CO_(2)/CH_(4)competitive adsorption shale gas reservoir CO_(2)geological storage gas recovery enhancement low-field NMR

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Damage constitutive model and experimental verification of seafloor massive sulfide

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Electronic Journal of Geotechnical Engineering 2015年第24期20卷 11969-11983页

作者： Jianhua, Hu Shaojun, Liu Qiong, Hu Yu, Dai College of Mechanical and Electrical Engineering Central South University Changsha China State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology Changsha China Shenzhen Research Institute of Central South University Shenzhen China

Damage constitutive model of seafloor massive sulfide(SMS) was selected as the research object. Strength of every unit of SMS was assumed of basing on Weibull distribution, and the breaking strength was supposed to meet the Drucker-Prager or Mohr-Coulomb criterion, a new damage constitutive equations in uniaxial compression condition was deduced. The uniaxial constitutive equation of seafloor massive sulfide based on D-P and M-C strength criterion can be calculated, and through theoretical and experimental curve's comparison, which is found that both are in good agreement, and there are a little difference when uniaxial damage constitutive curves based on the two strength criterions are compared. Mohr Coulomb constitutive and the experimental data curves are closer than the D-P constitutive curves. © 2015 ejge.

关键词： Weibull distribution

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