5000m扬矿管纵向振动研究

运用有限元的方法对深海采矿系统中的扬矿管进行了静力分析和动态分析,将５０００ｍ扬矿管等分成２０个两节点梁单元,应用等效线性化方法及结构对地震的反应原理建立了扬矿管纵向运动模型．采用ＡＤＩＮＡ有限元分析软件．通过研究在海水中不同海浪周期下扬矿管的振动特性可知：扬矿管的一阶纵向共振周期处于海洋中海浪通常出现的周期范围内;共振时扬矿管顶端与末端的纵向振动的相位差接近１８０°,产生轴向应力很大,给管子的设计和操作带来极大的影响．     

深海采矿扬矿硬管纵向振动的解析分析

深海采矿系统中，扬矿管纵向振动是影响扬矿管寿命的主要因素。本文对带有泵组及中间仓的阶梯式扬矿管的纵向振动进行了建模，并用解析方法对方程进行求解，通过计算机的模拟计算，分析了扬矿管纵向振动稳态响应的特性。     

扬矿管在海水中的整体运动分析

在对扬矿管进行受力分析的基础上，运用有限元的方法将5000m扬矿管等分成20个两节点梁单元，将梁单元受力简化，推导出梁单元运动方程。将单元总装成整体结构，并将节点力加到具体节点上，得出整体结构运动方程，用ADINA得到扬矿管整体运动的动态响应解。分析扬矿管的整体运动过程，扬矿管的横向、纵向振动及变形与各因素的关系，其结果可作为扬矿管设计和操作控制的依据。同时提出减小扬矿管变形和振动的措施。     

深海采矿扬矿管纵向振动的有限元分析

建立了深海采矿扬矿管的纵向振动微分方程,应用矩阵迭代法求取扬矿管的固有频率和固有振型,使用MAT-LAB得到了扬矿管固有频率,并绘制扬矿管的固有振型曲线。采用直接积分法中的Newmark法求解扬矿管的动力学响应,利用abaqus对扬矿管的纵向振动进行了仿真计算,绘制了扬矿管上4个位置的振动随时间的变化曲线,以及在10个采样时间点扬矿管振动随位置的变化曲线。     

深海采矿扬矿管非线性动态特性研究

深海采矿扬矿管受海浪、海流及采矿船的拖航作用产生大偏移。将扬矿管简化为梁单元,建立了几何非线性有限元模型,分析了液动力的计算方法,给出了增量平衡方程以及Newmark迭代方法。分析了采矿船在变速条件下扬矿管的偏移构型、运动速度、加速度及弯曲应力。扬矿管底端（即缓冲矿仓处）偏移位移达319.02m,扬矿管在顶部弯曲应力达13.1034MN/m^2。     

海洋采矿倾斜扬矿管提升工艺参数模拟

海洋采矿由于采矿船的运动、海浪及海流的阻力等,使扬矿管偏离垂直位置,出现倾斜状态。本文介绍了倾斜扬矿管提升系统工艺参数的数学建模,利用数值模拟,分析了其各工艺参数的变化规律,并同垂直提升扬矿管做了比较。     

基于Galerkin法的阶梯式扬矿管偏移分析

深海采矿系统中，连接在采矿船上的扬矿管受多种因素的影响。呈现出相当的复杂动力学特性，将扬矿管考虑成弹性梁，通过分析梁单元在垂直平面所受的各种横向载荷的影响，建立起了梁单元横向振动的数学模型，同时根据扬矿管的边界条件，利用Galerkin法，对此数学模型进行了求解，得到扬矿管相对于船的偏移，以及扬矿管的弯曲应力等。     

深海采矿扬矿管纵向振动的主动控制仿真研究

针对1 000 m海试采矿系统中扬矿管的纵向振动问题，采用基于线性二次型最优控制理论的主动控制方法来抑制振动。首先，建立了海洋环境下的扬矿管纵向运动方程，再推导得到LQG最优控制状态方程，然后运用Matlab编制模拟分析程序，仿真计算了泵和中间舱的纵向振动时间历程和主动控制所需控制力的最大值，结果表明该主动控制方法能有效地实现纵向振动抑制，减少幅度高达75％，所需控制力也符合1 000 m海试系统方案的设计要求。     

深海采矿扬矿管横向运动特性

将扬矿管考虑成弹性梁，通过分析梁单元在垂直平面所受的各种横向载荷的影响，建立梁单元横向振动的数学模型，同时根据扬矿管的边界条件，利用伽疗金法，对运动方程进行求解。求出扬矿管相对于船的偏移、扬矿管的弯曲应力以及在不同拖航速度及不同时刻扬矿管的偏移和弯曲应力的变化规律，给扬矿管的整体设计提供依据。     

1000 m深海采矿系统三维整体联动动态分析

1000m深海多金属结核开采试验系统的主体结构由采矿船、扬矿硬管、扬矿泵、中间仓、软管和集矿机等构成,系统各部分相互运动耦合。运用非线性有限元方法,将扬矿系统各部分等效为不同属性的管单元,建立了1000m海洋采矿试验系统整体联动分析的有限元模型,进行了系统整体联动的动力学数值模拟,得到不同联动模式下系统的运动特性与扬矿管的各种动态响应。研究结果表明：系统在设定的联动模式下以0．5m／s的速度联动时,中间仓的拖曳轨迹与船的运动轨迹基本一致;扬矿硬管上端水平作用力在转弯运动过程中变化较大,而垂直方向上的动态拉伸力呈稳定的交变力;扬矿硬管的弯曲应力较小,轴向应力较大。     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new