VIV response characteristics of a top-tensioned riser with bi-frequency parametric excitation
VIV response characteristics of a top-tensioned riser with bi-frequency parametric excitation
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双频参量激励顶张立管的 VIV 响应特性
DOI：
10.1016/j.oceaneng.2019.106490
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发表时间：
2019-10
影响因子：
5
通讯作者：
Tang Wenyong
中科院分区：
文献类型：
--
作者：
Yuan Yuchao;Xue Hongxiang;Tang Wenyong
顶张式立管在参数激励下的涡激振动问题近年来在海洋工程中受到越来越多的关注。本文采用已发表并经过验证的数值模型对90 m TTR在双频参数激励下的涡激振动响应进行了预测，并根据实时轴向拉力在每个时间步更新结构刚度特性。设计了24个双频参数激励工况，对涡激振动响应特性进行了系统研究。双频参数激励下的涡激振动响应与单频参数激励下的涡激振动响应有很大的不同。两个谐波张力分量之间的相位差对结构响应的影响是显著的，在动力分析中不能忽略。结构响应仍然具有周期性，而柔顺周期是两个谐波分量的最小公共周期。双频参数激励分量的联合作用可激励一些二次次亚谐波响应频率。通过定性比较和定量分析，分别揭示了双频单幅、HF&SA + LF&LA和HF&LA + LF&SA三种情况下的个体反应特征。文中还详细讨论了这种响应特性的基本机理，并得出了一些结论。
Vortex-induced vibration (VIV) of a top-tensioned riser (TTR) with parametric excitation has recently been receiving increasing attention in the ocean engineering. This paper adopts a published and validated numerical model to predict the VIV response of a 90 m TTR with bi-frequency parametric excitation, and the structural stiffness properties will be updated at each time step according to the real-time axial tension. Twenty-four bi-frequency parametric excitation cases are designed and simulated to investigate VIV response characteristics systematically. VIV response with bi-frequency parametric excitation is quite different from that with single-frequency one. The effect of the phase difference between two harmonic tension components on the structural response is significant, which cannot be ignored in dynamic analysis. The structural response still has periodicity, while the compliant period is the least common period of two harmonic components. The combined action of the bi-frequency parametric excitation components may excite some secondary sub-harmonic response frequencies. The individual response characteristics under Bi-frequency & Single-amplitude cases, HF&SA + LF&LA cases and HF&LA + LF&SA cases are revealed respectively by qualitative comparisons and quantitative analysis. The essential mechanism of the presented response characteristics is discussed in detail, and some conclusions are obtained.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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影响因子：
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