基于光纤传感技术的海洋立管形态重构研究  

Research on shape reconstruction of marine riser based on optical fiber sensing technology

作　　者：梁磊[1,2] 徐其伟 赖先宇 骆丙铈 LIANG Lei;XU Qiwei;LAI Xianyu;LUO Bingshi(National Engineering Research Center of Fiber Optic Sensing Technology and Networks,Wuhan University of Technology,Wuhan,Hubei 430070,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya,Hainan 572024,China)

机构地区：[1]武汉理工大学光纤传感技术与网络国家工程研究中心,湖北武汉430070 [2]武汉理工大学三亚科教创新园,海南三亚572024

出　　处：《光电子．激光》2024年第8期828-835,共8页Journal of Optoelectronics·Laser

基　　金：海南省重大科技计划项目(ZDKJ202019);三亚崖州湾科技城科研项目(SKJC-2020-01-016)资助项目。

摘　　要：海洋立管是海洋工程中的重要结构,为了确保立管的正常工作,本文提出了利用弱光纤布拉格光栅传感光缆完成立管形态重构的方法,并利用有限元仿真实验进行了验证。首先将传感光缆按照背负式管道的形式沿立管轴向安装,基于Frenet-Serret框架设计了立管的形态重构算法;然后构建了立管监测有限元模型,求解并提取了多种变形情况下传感光缆内部应变数据,结合算法完成了立管的三维形状重建;最后对形态重构误差进行了分析和计算。结果表明,设计的立管形态重构方法的尾端误差控制在1.7%以内。该方法的立管形态重建效果较好,监测形式简单,具有一定工程应用价值。Marine risers are important structures in marine engineering.In order to ensure their normal operation,this paper proposed a method that uses weak fiber Bragg grating sensing cables to complete shape reconstruction of the riser and uses the finite element simulation experiments to verify it.Firstly,the sensing cables were installed along the axis of the riser in the form of a backpack-style pipeline.Based on the Frenet-Serret framework,an algorithm for reconstructing the shape of the riser was designed.Then,a finite element model for monitoring risers was constructed,and strain data inside the sensing optical fiber cable various deformation conditions were extracted by solving the model.By combining algorithms,the three-dimensional shape of the riser was reconstructed.Finally,an analysis and calculation of the shape reconstruction error were performed.The results indicate that the end error of the designed riser shape reconstruction method was controlled within 1.7%.The method has a good effect on the reconstruction of the riser shape,with a simple monitoring form and certain engineering application value.

关 键 词：弱光纤布拉格光栅 形态重构 曲率 挠率 有限元 

分 类 号：O439[机械工程—光学工程]