均匀流下柔性立管涡激振动响应及涡激力载荷特性研究

发布时间：2018-10-20 13:46

【摘要】：采用模型试验的方法研究了均匀流下柔性立管的涡激振动(VIV)响应特性及涡激力载荷特性。对均匀流场中柔性立管的VIV响应特性进行了分析,而后通过欧拉-伯努利梁动态响应控制方程和最小二乘法求取了柔性立管顺流向(IL)和横流向(CF)的涡激力系数。研究结果表明:均匀流下柔性立管的VIV为位移和主导频率不随时间变化的稳态响应,顺流向涡激振动的主导频率为横流向的2倍;柔性立管的激励系数与强迫振动试验获得的系数不一致,无因次频率处于激励区间的激励系数存在负值,激励系数不仅和无因次频率及无因次振幅相关,还与CFIL方向位移相位角相关;在无因次频率0.13~0.22时,横流向的附加质量系数在1.5~3.0振荡变化;而顺流向的附加质量系数在无因次频率在0.26~0.42内从-1.0迅速增大到1.2后基本保持不变。
[Abstract]:The (VIV) response characteristics and the vortex-induced load characteristics of the flexible riser under uniform flow are studied by using the model test method. The VIV response characteristics of flexible riser in uniform flow field are analyzed, and the vortex-induced force coefficients of (IL) and (CF) in transverse flow are obtained by Euler-Bernoulli beam dynamic response control equation and least square method. The results show that the VIV of the flexible riser under uniform flow is the steady-state response of the displacement and dominant frequency with no change with time, and the dominant frequency of the vortex-induced vibration is 2 times that of the transverse flow. The excitation coefficient of flexible riser is not consistent with that obtained by forced vibration test. The excitation coefficient of dimensionless frequency in the excitation interval is negative, and the excitation coefficient is not only related to dimensionless frequency and dimensionless amplitude, It is also related to the phase angle of displacement in the CFIL direction, the additional mass coefficient in the transverse direction oscillates at 1.5 ~ 3.0 at the dimensionless frequency of 0.13 ~ 0.22, and the additional mass coefficient in the direction of flow direction increases from -1.0 to 1.2 at the frequency of 0.260.42.
【作者单位】：上海交通大学海洋工程国家重点实验室;上海交通大学高新船舶与深海开发装备协同创新中心;中国船舶及海洋工程设计研究院;海军装备研究院;
【基金】：国家自然科学基金资助项目(51239007;51279101;51490674;51490675)
【分类号】：TE95

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