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Fatigue analysis of water intake risers: Hydrodynamic damping effect and a hybrid frequency-time domain method

机译：水摄入提升管疲劳分析：流体动力阻尼效果及杂交频率时域法

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摘要

The fatigue performance is key to the design of water intake risers (WIRs), which is a novel concept used to convey cooling water for liquefaction of natural gas at sea. To estimate the fatigue life, it is crucial to accurately predict the response amplitude of the WIRs, which is dominated by hydrodynamic damping. In operational conditions, the motion amplitudes of WIRs are usually smaller than their diameter, and thus leading to a flow regime of KC 5. It is found in this flow regime; the hydrodynamic damping largely depends on the motion magnitude of the risers. To consider this coupling effect, a hybrid frequency-time domain fatigue analysis method is proposed, where a nonlinear stress transfer function is adopted. The hybrid method accounts for the coupling effect between the hydrodynamic damping and the structural motion. Significantly reducing the computational cost, this method provides results as accurate as that from a time domain analysis based on the relative velocity model with a constant drag coefficient. Furthermore, recommendations for further simplification of the fatigue analysis recognizing the coupling effect are given.
机译：疲劳性能是水进气口提升管（电线）设计的关键，该概念是用于输送海上天然气液化的冷却水的新概念。为了估计疲劳寿命，这是至关重要电线的响应幅度至关重要的是至关重要的，这是由流体动力阻尼的响应。在操作条件下，电线的运动幅度通常小于它们的直径，因此导致KC <5的流动制度<5。它在该流动状态下发现;流体动力学阻尼很大程度上取决于提升管的运动幅度。考虑该耦合效果，提出了一种混合频率 - 时域疲劳分析方法，其中采用非线性应力传递函数。混合方法考虑了流体动力阻尼与结构运动之间的耦合效应。显着降低计算成本，该方法提供了基于基于具有恒定阻力系数的相对速度模型的时域分析的结果。此外，给出了关于进一步简化识别偶联效应的疲劳分析的建议。

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  • 来源
    《Marine Structures》 |2021年第1期|102869.1-102869.15|共15页
  • 作者

    Gao Zhenguo; Efthymiou Mike; Cheng Liang; Zhou Tongming; Minguez Matthieu; Zhao Wenhua;

  • 作者单位

    Univ Western Australia Fac Engn & Math Sci 35 Stirling Highway Crawley WA 6009 Australia;

    Univ Western Australia Fac Engn & Math Sci 35 Stirling Highway Crawley WA 6009 Australia|ANDIES Shell Projects & Technol Kessler Pk NL-330 Rijswijk Netherlands;

    Univ Western Australia Fac Engn & Math Sci 35 Stirling Highway Crawley WA 6009 Australia|Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian 116024 Peoples R China;

    Univ Western Australia Fac Engn & Math Sci 35 Stirling Highway Crawley WA 6009 Australia;

    Genesis Nimes 19 Ave Feucheres F-30000 Nimes France;

    Univ Western Australia Fac Engn & Math Sci 35 Stirling Highway Crawley WA 6009 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Fatigue analysis; Water intake riser; Hydrodynamic damping; Low KC regime;

    机译：疲劳分析;水摄入口;流体动力阻尼;低KC制度;

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