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Buoyancy coupling with structural deformation analysis of ship based on finite element method

机译：基于有限元法的浮力耦合与船舶结构变形分析

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摘要

The hydrostatic balance of a ship floating on the water is the result of buoyancy coupling with structural deformation. As to the ship with a relatively flexible hull girder, this coupling phenomenon is very important for the accuracy of general design and structural analysis. However, the existing ship design methods could not solve this coupling problem accurately. Aiming at this problem, a new numerical method based on FEM, called Buoyancy Coupling with structural Deformation Analysis (BCDA), is presented in this paper to improve both efficiency and accuracy of ship design. In BCDA, the concept of buoyancy element is proposed to simulate element on hull wet surface. As to a buoyancy element, the buoyant force is regarded as properties of element rather than external load. The buoyant matrices for both quadrilateral and triangular elements are derived, and the structural stiffness matrix of buoyant element is corrected by buoyant matrix. Being different from the traditional FEM, constraints on translation freedom along vertical direction should not be added in BCDA. The generalized displacements for each node, which consist of displacements due to buoyancy change and structure elastic deformations, are obtained by solving the global equilibrium equations. The results of BCDA satisfy both structural mechanics equation and gravity-buoyancy balance equation. A 15,000 t launching barge is taken as example to verify the validity and accuracy of BCDA. With this example, it also proved that the coupling analysis of buoyancy and hull structural deformation is necessary for the general design and structural analysis of floating structure with relatively flexible hull. (C) 2016 Elsevier Ltd. All rights reserved.
机译：漂浮在水面上的船舶的静水平衡是浮力耦合与结构变形的结果。对于船体梁相对较灵活的船舶，这种耦合现象对于总体设计和结构分析的准确性非常重要。但是，现有的船舶设计方法不能准确地解决这一耦合问题。针对这一问题，本文提出了一种基于有限元的浮力耦合与结构变形分析的新数值方法，以提高船舶设计的效率和准确性。在BCDA中，提出了浮力元素的概念来模拟船体湿表面上的元素。对于浮力元件，浮力被认为是元件的特性，而不是外部载荷。推导了四边形和三角形单元的浮力矩阵，并用浮力矩阵对浮力单元的结构刚度矩阵进行了修正。与传统的有限元法不同，在BCDA中不应添加对垂直方向平移自由度的限制。通过求解整体平衡方程，可获得每个节点的广义位移，该位移由浮力变化和结构弹性变形引起的位移组成。 BCDA的结果既满足结构力学方程又满足重力浮力平衡方程。以一艘15,000吨的下水驳船为例，验证了BCDA的有效性和准确性。通过该实例，还证明了浮力与船体结构变形的耦合分析对于具有相对柔性船体的浮式结构的总体设计和结构分析是必要的。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Ocean Engineering》 |2016年第15期|254-267|共14页
  • 作者

    Yan-Yun Yu; Yan Lin; Kai Li; Ming Chen;

  • 作者单位

    Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dalian 116023, Peoples R China|Dalian Univ Technol, Ship CAD Engn Ctr, Dalian 116023, Peoples R China;

    Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dalian 116023, Peoples R China|Dalian Univ Technol, Ship CAD Engn Ctr, Dalian 116023, Peoples R China;

    Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dalian 116023, Peoples R China|Dalian Univ Technol, Ship CAD Engn Ctr, Dalian 116023, Peoples R China;

    Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dalian 116023, Peoples R China|Dalian Univ Technol, Ship CAD Engn Ctr, Dalian 116023, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ship; Floating structure; Finite element method (FEM); Buoyancy; Hull structural deformation; Coupling;

    机译：船舶;浮动结构;有限元法;浮力;船体结构变形;耦合;

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