深海采矿长管线系统布放过程的数值仿真

来源期刊：中南大学学报(自然科学版)2004年第6期

论文作者：王刚 刘少军 李力

文章页码：978 - 982

关键词：深海采矿;管线;布放;数值仿真;非线性有限元

Key words：deep-sea mining; pipe line; launching; numerical simulation; nonlinear finite element Method

摘    要：运用非线性有限元方法,将深海多金属结核开采系统的扬矿硬管、扬矿泵、中间仓和扬矿软管等部分等效为不同属性的管单元,建立了1 000 m水深海洋试验系统扬矿子系统的有限元分析模型;采用Morison公式计算了水下管线的液动力载荷。基于该模型,进行了长管线系统布放过程的动力学数值模拟,得出了在不同布放操作模式下扬矿子系统的各种动态响应,尤其是软管初始构形的动态形成过程;仿真显示了在某些布放操作模式下,软管缠绕现象发生的全过程。研究结果表明:集矿机着底后,在下放硬管的同时,应通过集矿机的运动使软管尽早地形成马鞍形,以有效地消除缠绕现象。

Abstract: The numerical simulation model of the poly-metallic nodule mining system in 1 000 m sea trial was constructed by nonlinear finite element method. In this way, the pipe units with different properties are looked as the equivalents of several parts of the lift pipe subsystem, which consists of the steel pipe, the pump , buffer, and the flexible hose in deep-sea. The hydrodynamic force of the ocean environment is calculated according to Morison formula. Based on the mechanics model, the dynamic numerical simulations of launching of the long pipe line in deep-sea mining were carried out. The dynamics responses of the lift pipe system under the different launching operation modes were obtained, especially the initial configuration of the flexible hose. It is found that the flexible hose easily enwind under some launching operation modes by numerical simulation.In order to avoid that situation, while the pipes are launching, the flexible hose should be formed a saddle shape as soon as possible by the collector’s motion after the collector land the sea floor.