Dynamic Interactions of a Pipe System With a Seafloor Miner for Deep-Ocean Hardrock Mining

用于深海硬岩采矿的管道系统与海底采矿机的动态相互作用

• 批准号: 9531182
• 负责人: Jin Chung
• 金额: $ 19.96万
• 依托单位: Colorado School of Mines
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9531182&HistoricalAwards=false
• 关键词: Dynamic; Interactions; Pipe; System; Seafloor

9531182 Chung Present theory is based on incorporating a new concept of vertical pipe connecting to a miner and application of external (control) force on the pipe for the control of pipe- miner motions. Modeling of an entire pipe-miner system pin-joins a horizontal pipe to the long, near-vertical pipe system and to a self-propelling seafloor miner. The elastic joints along the pipe can be made effective in changing the axial, as well as, bending characteristics. To apply external (control) forces to the joints for the control of the lateral motion of the pipe, the flexible joints will be modeled by finite element (FEM), as well as combined (rigid body) element (RBE). The accuracy and advantages of the two methods will be compared. The pin joint leads the entire system to zero eigenvalue and rigid mode, and the weight, as the inner axial force of the vertical pipe, further influences the eigenvalues of the entire system. A shift technique will solve this problem. The proposed 3-D nonlinear coupled responses with nonlinear axial dampers installed at the joints will reduce the axial stress and also influence the bending and torsion, as well. Soil (sediment) resistance for the miner will be modeled by both DEM (discrete elements) and FEM. The DEM modeling will use a mass of discrete particles of general geometry. Preliminary modeling of soil particles indicates that DEM modeling is very promising to examine micromechanical details of the soil particles. ***

9531182钟目前的理论基于一个新的概念，即垂直管道连接到采矿机，并在管道上施加外部(控制)力来控制管道-采矿机的运动。整个管道-矿工系统的模型将水平管道销连接到长的、接近垂直的管道系统和自行式海底矿工。沿管道的弹性接头可以有效地改变轴向以及弯曲特性。为了对接头施加外力以控制管道的横向运动，柔性接头将采用有限元和组合(刚体)单元来建模。比较了两种方法的精度和优点。销钉连接使整个系统的特征值为零且为刚性振型，而重量作为竖直管道的内力，进一步影响了整个系统的特征值。换班技术将解决这个问题。在节点处安装非线性轴向阻尼器的三维非线性耦合响应将降低轴向应力，并对弯曲和扭转产生影响。矿工的土壤(泥沙)阻力将用离散单元和有限元两种方法来模拟。DEM建模将使用大量具有一般几何形状的离散粒子。对土壤颗粒的初步模拟表明，DEM模型在研究土壤颗粒的微观力学细节方面具有很好的应用前景。***