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首页> 外文会议>The 7th China-Japan-Korea joint symposium on optimization of structural and mechanical systems >Optimal Allocations of Seismic Restraints for Pipeline Systems in Ships
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Optimal Allocations of Seismic Restraints for Pipeline Systems in Ships

机译：船舶管道系统的抗震约束优化分配

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摘要

Pipelines have been widely used in ships and offshore structures (like drilling platforms, FPSO and subsea production systems, etc).Standards and codes are not well established for the optimal allocations of seismic restraints in pipeline systems of ships.With the applications of powerful engines and the improvements on productivity, pipelines installed in ships suffer from high vibration levels. The numbers and allocations of the seismic restraints can greatly affect the dynamic stress distribution, deflection, fatigue life and the pipeline construction costs. Therefore the corresponding optimization models and design methods should be conducted to prevent pipeline damages due to vibration.In this paper, two kinds of comprehensive seismic restraints allocation optimization design models considering strength, stiffness, buckling, eigen frequency and vibration level difference constraints are proposed. The code-based and the geometry optimization-based design methods are presented and compared.According to the presented methods, the initial numbers of seismic restraints can be defined by ASME B31 Code, or by random assumptions. Then the locations of each restraint are obtained by geometry optimization.An iterative procedure was employed in solving the presented optimization models, in which an adjustable searching step is adopted to determine the critical distance of the neighboring restraints. The criteria of the deletion and adding of the seismic restraints in pipeline depend on the satisfaction of behavior constraints and the value of critical distance.After optimization, the optimal numbers and locations of the seismic restraints in pipeline are obtained.Engineering design examples showed the effects of different choices of the objective functions on the optimal results, like construction costs, the maximum deflection, and the structural strain energy of pipelines. The effectiveness and simplicity of the proposed methods in engineering design are also demonstrated.
机译：管道已广泛用于船舶和近海结构（如钻井平台，FPSO和海底生产系统等）中，但尚无很好的标准和规范来确定船舶管道系统中的抗震约束分配。随着生产率的提高，船上安装的管道遭受了很高的振动。地震约束的数量和分配会极大地影响动应力的分布，挠度，疲劳寿命和管道建设成本。因此，应采取相应的优化模型和设计方法，以防止管道由于振动而损坏。本文提出了两种综合的抗震约束分配优化设计模型，其中考虑了强度，刚度，屈曲，本征频率和振动水平差约束。提出并比较了基于代码的设计方法和基于几何优化的设计方法。根据提出的方法，可以通过ASME B31代码或通过随机假设来定义地震约束的初始数量。然后通过几何优化获得每个约束的位置。在求解所提出的优化模型时采用了迭代过程，其中采用可调搜索步骤确定相邻约束的临界距离。管道抗震约束物的删除和增加的标准取决于行为约束的满足程度和临界距离的值。经过优化，得出了管道抗震约束物的最佳数量和位置。工程设计实例表明了其效果。目标函数的不同选择对最佳结果的影响，例如建筑成本，最大挠度和管道的结构应变能。还证明了所提出方法在工程设计中的有效性和简便性。

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