基于附加水动力振动反演的深海平台半隐耦合方法及试验研究

项目名称： 基于附加水动力振动反演的深海平台半隐耦合方法及试验研究

项目编号： No.51279188

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 水利工程

项目作者： 刘福顺

作者单位： 中国海洋大学

项目金额： 82万元

中文摘要： 在外部海洋动力环境对深海工程结构作用的研究中，非线性流固耦合分析是确定深海平台系统运动响应并判定其稳定性的关键所在。本项目以我国南海油气资源开发为工程背景，针对深海浮式平台非线性流固耦合计算所需附加水动力参数离散性较大并且对计算资源要求较高、计算速度过慢的问题，一方面开展柱体结构上流体附加质量振动反演算法研究，并借助取得的海洋平台非传统阻尼特性识别技术，开展流体附加阻尼振动反演算法，以及浮式平台系统低频运动中慢漂阻尼和系泊系统阻尼的评估方法研究，以提高浮式结构运动响应计算精度；另一方面，研究浮式平台因系泊索截断而引起的边界动力修正方法，探索浮式平台模型转换技术并发展一种超模型以提高计算效率。将流体附加水动力参数融入结构控制方程，发展一种深海浮式平台半隐式耦合算法。该方法介于弱耦合与强耦合算法之间，较弱耦合算法具有更好的稳定性及计算精度，较强耦合算法计算时效更为明显，具有更好的工程应用前景。

中文关键词： 海洋平台；振动响应；附加质量；频域算法；极值留数

英文摘要： In the study of external marine dynamic environment forces on deep water structures, nonlinear fluid-solid interaction analysis is a key step for motion prediction and stability judgment. When implementing the nonlinear fluid-solid interaction analysis for floating structures used for the exploitation of the South China Sea, added hydrodynamic parameters performed scattered and computed costly. Therefore, we focus on how to improve the dynamic prediction of floating structures one sides, i.e., an estimation method of added mass of fluids based on dynamic response of cylinders in water is proposed, the added damping of surrounded water is also studied based on our damping identification method proposed recently, and the assessment method of slow drift and mooring damping is investigated too. On the other hand, we concentrate on how to reduce the complexity of the complex floating structure with mooring systems to improve the computing effiency, and then a super-model is developed based on model conversion techniques, including interface conditions updating method caused by removing mooring lines, and the measurements dealing with spatial incompleteness of measured mode shapes from limited numbers of sensors and so on. At last, a semi-implicit coupling method is developed by combining the added mass and damping fr

英文关键词： Offshore platform；Response；Added mass；Frequency-domain algorithm；Pole-Residue