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Theoretical design and dynamic simulation of new mining paths of tracked miner on deep seafloor

Journal of Central South University 2013年第4期20卷 918-923页

作者：戴瑜刘少军 School of Information Science and Engineering Central South University 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

With comprehensive considerations of the operational safety and collection efficiency for the tracked miner collecting the seafloor poly-metallic nodules, two new improved mining paths for the miner on the deep seafloor were proposed. Compared to the conventional mining path, the design principles and superiorities of the two new paths are that the miner turning with relative long radius should avoid large sinkage and high slip, so as to ensure its operational safety, while the space between its straight-line trajectories before and after the turning is optimum, which is designed as the total width of the miner, and collect nodules as more as possible, so as to ensure its collection efficiency. To realize the new mining paths, theoretical designs and quantitative calculations were carried out to determine the exact positions for the speed controls of the miner during its whole operation process. With the new dynamic model of the miner, and through regulations of the speeds of the left and right tracks of the miner on the exact motion positions according to the theoretical calculations, the two new improved mining paths for the miner on the seafloor were successfully simulated, thus the turning radius of the miner in the simulation is about 21.8 m, while the distance between the straight-line trajectories before and after the turning is about 5.2 m. The dynamic simulation results preliminarily prove the feasibility of these two new mining paths, and further can provide important theoretical guidance and useful technical reference for the practical tracked miner operation and control on the seafloor.

关键词： deep ocean mining tracked miner single-body model mesh element model collection efficiency mining path dynamic simulation

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Influence on the Solid−Liquid Two-Phase Flow from Cross-Section Area of Slurry Pumps for deep-sea Mining

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China Ocean Engineering 2022年第3期36卷 439-450页

作者： WANG Run-kun ZHU Zu-chao SU Xiang-hui TANG Da-sheng JIN Xing Maciej GRUSZCZYNSKI The Province Key Lab of Fluid Transmission Technology Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Changsha Institute of Mining and MetallurgyChangsha 410000China Wroclaw University of Environmental and Life Sciences Wroclaw 52-124Poland

To explore the mechanism of solid-liquid two-phase flow in deep-sea mining pumps,this paper investigates the influences of the impeller cross-section area on the multi-phase flow in the slurry *** and numerical results are presented for two-phase flow in four impellers with different cross-section *** show that the degree of vortex strength and the passing capacity of particles increase as the cross-section area of the *** addition,the correlations between the two-phase flow and cross-section area have been revealed by a mathematical model taking the force of the flow field into *** simulation results confirm the theoretical analysis,while the experimental pump performances validate the numerical *** influence of the cross-section area on two-phase flow and pump performance could provide theoretical support for the design of high-performance deep-sea mining slurry pumps.

关键词： deep-sea mining slurry pump CFD-DEM solid-liquid two-phase flow Rossby number

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Study on active heave compensation system of deep-sea mining based on dynamic vibration absorber and its feedback control

Study on active heave compensation system of deep-sea mining...

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

作者： Li, Liujun Liu, Shaojun State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology College of Mechanical and Electrical Engineering Central South University Changsha China

ISBN: (纸本)9781880653951

Heave compensation system is necessary for the safety and the production efficiency as well as the component lifetime of the deep-sea mining system. Traditional heave compensation systems is a passive shock-absorbing system employing accumulator and high pressure air system, heave compensator cylinders, make-up units and so on, which need a much bigger shipboard space. To isolate the long lift pipeline with several thousand meters from the bending load induced by the irregular wave with reasonable deck space and energy consumption , a novel active heave compensation system of deep-sea mining based on dynamic vibration absorber was proposed in this paper. The dynamic models of the active heave compensation system with hydraulic actuator are established to investigate the performance of the active heave compensation system. And the feedback control was applied for the heave compensation system for increased effectiveness over a wider frequency band. The performance and the response of the proposed system with hydraulic actuator were simulated in time domain and frequency domain. The result shows that the active heave compensator based on dynamic vibration absorber with feedback controller can have the best performance of heave compensation and it is practical to isolate the lift pipe and its support platform from the ship motion induced by the irregular wave. Copyright © 2011 by The International Society of Offshore and Polar Engineers (ISOPE).

关键词： Dynamic models

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development of dynamics model of seafloor mining system and analysis of influence factors in the deploying process

Development of dynamics model of seafloor mining system and ...

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8th 2009 ISOPE Ocean Mining and Gas Hydrates Symposium, ISOPE OMS-2009

作者： Hu, Xiaozhou Liu, Shaojun Du, Bin College of Mechanical and Electrical Engineering Central South University Changsha Hunan China State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology China

ISBN: (纸本)9781880653753

In this paper, a computational model is developed to simulate the dynamics of a riser system in the process of deployment. From the beginning of deployment process, the riser is considered to be vertically suspended to a deploying frame which is located at the support vessel, and gradually pulled into the sea water by mining tool. Considering the variable length of the immersed riser, a numerical model is presented to capture the dynamics of the riser with a lumped mass approximation. Discretization scheme for riser and pipe geometry and methodology for calculating the internal and external force acting on riser are presented. The riser and the pipe are discretisized into an assembly of N linear elements. The mass of the riser and pipe are lumped at the N+l node points. A 4th order Runge-Kutta approach with proper step size is employed to achieve numerical implementation. Four ocean conditions which are proper for deployment are considered, and the effect of deploying velocity is also researched. The results indicate that the ocean condition and the deploying velocity are playing an important role to determine the kinematic and dynamic condition of the deployment process of deep sea mining systems, and the research results can provide basic information for the design of the heave compensation system and reduction of dynamics effects of riser system on seafloor mining tool during the deploying process. Copyright © 2009 by The International Society of Offshore and Polar Engineers (ISOPE).

关键词： Dynamics

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Geochronological and geochemical constraints on the petrogenesis and geodynamic process of Hemler,Vlinder,and Il'ichev seamount lavas in NW Pacific

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Science China Earth Sciences 2024年第6期67卷 1856-1871页

作者： Xun WEI Yan ZHANG Xuefa SHI Hui ZHANG Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Qingdao Marine Science and Technology CenterQingdao 266237China Shandong Key Laboratory of Deep Sea Mineral Resources Development(Preparatory) Qingdao 266061China

Oceanic intraplate volcanoes with linear age progressions are usually accepted to be derived from melting of an upwelling mantle *** seamount groups in NW Pacific,however,show complex age-distance relationships that are difficult to explain using the classic“mantle plume hypothesis”,and thus their origins are *** this study,we present ^(40)Ar-^(39)Ar age,geochemical,and Sr-Nd-Pb-Hf isotopic data of lavas from Hemler,Vlinder,and Il’ichev seamounts in NW Pacific,to elucidate their petrogenesis and geodynamic *** lavas from Hemler,Vlinder,and Il’ichev seamounts are classified as alkali basalt,basanite/nephelinite,and *** with Mg O>8 wt.%exhibit high contents of CaO,FeO^(T),and TiO_(2),similar to the composition of melts formed from reaction between carbonated eclogite-derived melts and fertile *** lavas have elevated Zr/Hf ratios(40.6-45.2)and negative Zr and Hf anomalies,indicating the presence of a carbonate component in the mantle *** are enriched in incompatible trace elements and have enriched mantle 1(EM1)-like SrNd-Pb-Hf isotopic *** isotopic compositions of Vlinder,Il’ichev basanite,and Hemler lavas in this study are similar to the Rarotonga *** occurring at the same seamount,the Il’ichev alkali basalts display more depleted SrNd-Hf isotopic compositions compared to Il’ichev *** to plate tectonic reconstruction results,the ages of Hemler(100.1 Ma),Vlinder pre-(100.2 Ma)and post-shield(87.5 Ma),and Il’ichev(56.4 Ma)lavas clearly deviate from the Macdonald,Arago,Rarotonga,and Samoa hotspot tracks,indicating that they cannot directly originate from mantle *** propose that in the mid-Cretaceous,when the Pacific plate passed over Rarotonga hotspot,melting of Rarotonga plume formed the Vlinder(main-shield stage),Pako,and Ioah *** Rarotonga(and possibly Samoa)plume materials would have been dispersed into the surrounding asthenosphere by mantle conve

关键词： Mantle plume Magellan seamount trail Carbonated mantle component Hotspot Lithosphere extension

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Behavior of single particle and group particles in vertical lifting pipe in China

Behavior of single particle and group particles in vertical ...

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

作者： Yang, Ning Chen, Guangguo Tang, Dasheng Jin, Xing Xiao, Hong Changsha Research Institute of Mining and Metallurgy State Key Laboratory of Exploitation and Utilization of Deep-sea Mineral Resources Changsha Hunan China

ISBN: (纸本)9781880653951

Fluidization is one of fundamental relative motion forms in solid-liquid two-phase flow. The fluid velocity, particle concentration, etc. are important parameters in engineering design. Proper parameters could avoid pipeline clog, and increase transport efficiency. With single particle, uniform and non-uniform group particles, there are three kinds of suspension experiments have been done. The testing apparatus is an indoor nodule lifting system with 30-m height and 200-mm inner diameter. This article describes the status of particle and group particles move upward in the vertical pipe. It also analyzes the influence of factors such as particle concentration, diameter, gradation and boundary conditions on single and group suspension velocity. At the same time, it obtains empirical formula of suspension velocity of particle and group particles in vertical lifting. Copyright © 2011 by The International Society of Offshore and Polar Engineers (ISOPE).

关键词： Boundary conditions

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A SiC asymmetric cell trench MOSFET with a split gate and integrated p^(+)-poly Si/SiC heterojunction freewheeling diode

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Chinese Physics B 2023年第5期32卷 697-704页

作者：蒋铠哲张孝冬田川张升荣郑理强赫荣钊沈重 State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikou 570228China Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanya 572000China Sansha Guohaixintong Technology Development Co. LtdHaikou 570100China

A new SiC asymmetric cell trench metal–oxide–semiconductor field effect transistor(MOSFET)with a split gate(SG)and integrated p^(+)-poly Si/SiC heterojunction freewheeling diode(SGHJD-TMOS)is investigated in this *** SG structure of the SGHJD-TMOS structure can effectively reduce the gate-drain capacitance and reduce the high gateoxide electric *** integrated p^(+)-poly Si/SiC heterojunction freewheeling diode substantially improves body diode characteristics and reduces switching losses without degrading the static characteristics of the *** analysis results show that,compared with the conventional asymmetric cell trench MOSFET(CA-TMOS),the high-frequency figure of merit(HF-FOM,R_(on,sp)×Q_(gd,sp))is reduced by 92.5%,and the gate-oxide electric field is reduced by 75%.In addition,the forward conduction voltage drop(V_(F))and gate-drain charge(Q_(gd))are reduced from 2.90 V and 63.5μC/cm^(2) in the CA-TMOS to 1.80 V and 26.1μC/cm^(2) in the SGHJD-TMOS,*** with the CA-TMOS,the turn-on loss(E_(on)) and turn-off loss(E_(off)) of the SGHJD-TMOS are reduced by 21.1%and 12.2%,respectively.

关键词： split gate(SG) heterojunction freewheeling diode(HJD) SiC asymmetric cell trench MOSFET turn-on loss turn-off loss

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Comparative study on the arrangements of the support rolls of an amphibious armored vehicle

Comparative study on the arrangements of the support rolls o...

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International Conference on Digital Manufacturing and Automation (ICDMA)

作者： Chen, Lingping Liu, Shaojun Li, Xiaofei Zeng, Yihui School of Mechanical and Electrical Engineering Central South University Changsha China State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology China Sany Truck Crane Company China

ISBN: (纸本)9780769542867

The impact between track and wheels of an amphibious armored vehicle in operation is the important reason of fatigue failure, and it will be the most complex in the steering condition. A dynamic model of an amphibious armored vehicle was established based on the ATV module of the ADAMS software. Simulations in the steering condition were carried out according to several typical arrangements of the support rolls. The simulation results show that reasonable arrangement of the support rolls would make the vertical beating of the upper side of the track and the impact between the track and the sprocket smaller, and improve the dynamic performance of the amphibious armored vehicle. © 2010 IEEE.

关键词： Armored vehicles

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Modeling of active heave compensation system of deep-sea mining based on dynamic vibration absorber and its H∞ robust control

Modeling of active heave compensation system of deep-sea min...

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International Conference on Computer, Mechatronics, Control and Electronic Engineering

作者： Li, Liujun Liu, Shaojun College of Mechanical and Electrical Engineering Central South University Changsha Hunan 410083 China State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Technology Changsha Hunan 410083 China

ISBN: (纸本)9781424479566

The heave compensation system is vital for the deep-sea mining system undergoes excessive vibrations due to irregular wave loads for both normal operating and extreme conditions. To ensure its safety and operation efficiency, a novel active heave compensation system of deep-sea mining based on dynamic vibration absorber was proposed in this paper. The three-degree-of-freedom dynamic models of active heave compensation system based on dynamic vibration absorber in irregular wave are established. A H∞ Robust controller is designed for active heave compensation system by applying robust loop shaping control. The performance of H∞ robust controller and its robustness stability of the system are simulated and analyzed in frequency domain. The results show that the performance of the system in wave energy concentrated frequency domain of China's deep-sea mining field was improved by the concentrated weighting of acceleration output. And it also shows that the designed H∞ controller is perfect in system robustness stability against some parameter fluctuations of the system model. Therefore the designed active heave compensation system is practical to isolate the lift pipe and its support platform from the significant vibration of the ship motion induced by the irregular wave. © 2010 IEEE.

关键词： Frequency domain analysis

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Experimental study of the shear strength of cobalt-rich crusts

Experimental study of the shear strength of cobalt-rich crus...

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2013 International Conference on Mechanics and Mechatronics, ICMM 2013

作者： Wu, Hong Yun Chen, Zheng State Key Laboratory of deep-sea mineral resources development and utilization technology Changsha City Hunan China Changsha Institute of Mining Research Co. Ltd Changsha City Hunan China

ISBN: (纸本)9783037858714

The shear strength parameter of cobalt-rich crusts can be used to design cobalt-rich crusts mining head. The shearing test of cobalt-rich crusts sample was done with different angle shearing testing apparatus. Firstly, the cobalt-rich crusts sample with the size of 50mm×50mm×50mm cube was clamped in the variable angle plate. Secondly, the sample ware loaded till to be damaged. Lastly, the damaged load were recorded at the degree of 50, 60 and 70 to establish their shearing strength and normal stress empirical formula. According to the testing result, its cohesion and internal friction angle parameters are respectively 0.275MPa and 54.43 degree. Restricted by the number of samples and limited by laboratory testing, in-situ shearing strength test should be carried out to improve the proposed empirical formula. © (2013) Trans Tech Publications, Switzerland.

关键词： Shearing

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