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Dynamic response analysis of deep-sea mining riser based on vector form intrinsic finite element method

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 作者 单位 邮编 徐靖昌* 大连理工大学 工程力学系 116024 郑　皓 长沙矿冶研究院有限责任公司 深海矿产资源开发利用国家重点实验室 闫鸿浩 大连理工大学 工程力学系 张明 长沙矿冶研究院有限责任公司 深海矿产资源开发利用国家重点实验室 王莹莹 中国石油大学（北京） 安全与海洋工程学院

深海采矿立管是金属结核、富钴结壳、硫化物等水下金属矿产采集输送系统的重要组成部分，复杂海洋环境载荷对立管力学特性产生了不利影响。向量式有限元法是基于向量式力学的一种新的动力学分析方法，文章基于向量式有限元法编制Matlab程序对水下5000米级采矿立管进行动力响应分析，计算立管在波浪、海流等条件下的位移构型、轴向内力和弯矩分布，并将结果与Abaqus和Orcaflex结果进行对比验证，同时运用该方法进一步分析了采矿船运动、结构阻尼及内流速度对立管动力响应的影响。结果表明，采矿船运动会增大立管横向偏移及两端轴力幅值，结构阻尼会降低采矿船对立管的影响并使结构更快趋于稳定，内流则会使得立管顶端轴力减小，且减小量与内流速度正相关。同时也表明，向量式有限元法在模拟采矿立管动力响应行为具有较高准确性和可行性，为深海采矿立管机理研究提供了一种新的简便的有限元方法。

Deep-sea mining riser is an important part of the collection and transportation system of underwater metal minerals such as metal nodules, cobalt-rich crusts and sulfides. The complex marine environment load has an adverse effect on the mechanical properties of the riser. The vector form intrinsic finite element（VFIFE）is a new dynamic analysis method based on vector mechanics. In this paper, the Matlab program based on the VFIFE is used to analyze the dynamic response of the underwater 5000m mining riser. The displacement configuration, axial internal force and bending moment distribution of the riser under the conditions of wave and current are calculated, and the results are compared with Abaqus and Orcaflex. The effects of mining ship motion, structural damping and internal flow velocity on the dynamic response of the riser are further analyzed. The results show that the movement of the mining ship will increase the lateral deviation of the riser and the amplitude of the axial force at both ends. The structural damping will reduce the influence of the mining ship on the riser and make the structure tend to be stable faster. The internal flow will reduce the axial force at the top of the riser, and the reduction is positively correlated with the internal flow velocity. It also shows that VFIFE has high accuracy and feasibility in simulating the dynamic response behavior, and provides a new and simple finite element method for the study of deep-sea mining riser mechanism.
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