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| Dynamic response analysis of deep-sea mining riser based on vector form intrinsic finite element method |
| Received:March 11, 2024 Revised:April 13, 2024 |
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| DOI：10.7511/jslx20240311001 |
| KeyWord:deep sea mining riser vector from intrinsic finite element(VFIFE) dynamic response wave current load Inward flow mining vessel movement |
| Author | Institution |
| 徐靖昌 |
大连理工大学 工程力学系, 大连 ;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, 长沙 |
| 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, 长沙 |
| 闫鸿浩 |
大连理工大学 工程力学系, 大连 |
| 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, 长沙 |
| 王莹莹 |
中国石油大学北京 安全与海洋工程学院, 北京 |
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| Abstract: |
| A 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)methood 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 an underwater 5000 m 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 come 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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