Abst'/> Coupled nonlinear instability of cable subjected to combined hydrodynamic and ice loads
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Coupled nonlinear instability of cable subjected to combined hydrodynamic and ice loads

机译：水动力和冰荷载共同作用下电缆的耦合非线性不稳定性

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摘要

AbstractIn this paper, a comprehensive study on the parametric and auto-parametric instability of taut moorings due to combined hydrodynamic and ice loads is conducted. In this regard, a modal analysis is performed that includes the geometric nonlinearity of the mooring cables along with the combined effect of hydrodynamic and ice loads. The stability of the mooring cable around the 2:1 internal resonance region is analysed in the presence of out-of-plane ice-load which is calculated using a semi-empirical ice load-penetration evolution. It is shown that the geometric nonlinearity along with coupled hydrody namic and ice loads play an important role in the modal interaction which may lead to the large amplitude vibrations, i.e., instability. Stability boundaries near the 2:1 resonance region are determined through simulations by observing the onset of the oscillation in the out-of-plane modes. Beyond this boundary, the instability or jump in the response may occur and this could lead to the fatigue failure of the mooring cables. A parametric study on the stability boundary based on varying cable pretension and fairlead slope is also conducted. This reveals that increasing the cable pretension and the fairlead slope can effectively mitigate the parametric and auto-parametric instability in out-of-plane modes of mooring cables.
机译： 摘要 本文对由于流体动力和冰荷载共同作用而导致的系紧系泊参数和自参数不稳定性进行了全面研究。在这方面，进行了模态分析，包括系泊缆索的几何非线性以及流体动力和冰荷载的综合作用。在存在平面外冰负荷的情况下，分析了系泊缆索在2：1内部共振区域周围的稳定性，该冰负荷是使用半经验冰负荷穿透演化计算的。结果表明，几何非线性以及水动力和冰载荷耦合在模态相互作用中起着重要作用，这可能导致大振幅振动，即不稳定性。通过在平面外模式下观察振荡的开始，通过仿真确定了2：1共振区域附近的稳定性边界。超出此边界，可能会发生响应的不稳定或跳跃，这可能会导致系泊电缆的疲劳破坏。还进行了基于变化的电缆预应力和导缆斜率的稳定边界参数研究。这表明增加电缆的预应力和导缆斜率可以有效地缓解系泊电缆平面外模式下的参数和自参数不稳定性。

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  • 来源
    《Ocean Engineering》 |2018年第15期|486-499|共14页
  • 作者

    R. Ghoshal; A. Yenduri; A. Ahmed; X. Qian; R.K. Jaiman;

  • 作者单位

    Keppel-NUS Corporate Laboratory, National University of Singapore;

    Keppel-NUS Corporate Laboratory, National University of Singapore;

    Keppel-NUS Corporate Laboratory, National University of Singapore;

    Department of Civil and Environmental Engineering, National University of Singapore;

    Department of Mechanical Engineering, National University of Singapore;

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  • 正文语种 eng
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  • 关键词

    Parametric instability; Moorings; Ice load; Resonance; Stability boundary;

    机译：参数不稳定性;系泊;冰荷载;共振;稳定性边界;

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