均匀流下柔性立管涡激振动响应及涡激力载荷特性研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (22) : 14-21.

论文

宋磊建1,2，付世晓 ,2，任铁1,2,3，于大鹏4，张萌萌1,2

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Structural responses and vortex-induced force of flexible risers undergoing vortex-induced vibration in uniform flow

Song Lei-Jian1, 2, Fu Shi-Xiao1,2, Ren Tie1,2,3, Yu Dapeng4, Zhang Mengmeng1,2

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文章历史 +

摘要

本文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。文中首先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CF&IL方向位移相位角相关；在无因次频率0.13到0.22下，横流向的附加质量系数在1.5到3.0之间振荡变化；而顺流向的附加质量系数在无因次频率0.26到0.42的区间内从-1.0迅速增大到1.2后基本保持不变。

Abstract

In this study, the structural responses and vortex-induced forces of flexible risers undergoing vortex-induced vibration (VIV) in uniform flow were investigated. The VIV response characteristics are analyzed using the measured strains. Then, using the Euler Bernoulli beam structure dynamic equation and the least square method, the vortex-induced force coefficients in cross-flow (CF) and in-line (IL) direction were also be computed. The results indicate that that VIV of the flexible riser under uniform current is steady vibration with the amplitude and dominant frequency independent with time and the dominant frequency in the IL direction is twice as much as that in the CF direction. The excitation coefficients of flexible riser do not always agree with those obtained by the forced oscillation tests: some excitation coefficients are even negative within the usual defined exciting non-dimensional frequency regime, and are related with not only the non-dimensional frequency and amplitude but also phase angles of the CF&IL displacements. In the CF direction, when the non-dimensional frequency varies from 0.13 to 0.22, the added-mass coefficient oscillates between 1.5 and 3.0; In the IL direction, the added mass coefficient increases quickly from -1.0 to 1.2 and then keeps constantly when the non-dimensional frequency varies from 0.26 to 0.42.

导出引用

宋磊建1,2，付世晓,2，任铁1,2,3，于大鹏4，张萌萌1,2. 均匀流下柔性立管涡激振动响应及涡激力载荷特性研究[J]. 振动与冲击, 2017, 36(22): 14-21

Song Lei-Jian1, 2, Fu Shi-Xiao1,2, Ren Tie1,2,3, Yu Dapeng4, Zhang Mengmeng1,2. Structural responses and vortex-induced force of flexible risers undergoing vortex-induced vibration in uniform flow[J]. Journal of Vibration and Shock, 2017, 36(22): 14-21

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