摘要
内孤立波能够引起强剪切流和巨大的冲击荷载，对海洋平台和海洋立管等海上结构物会构成危险，而关于内孤立波对海洋立管作用的研究很少。本文根据描述内孤立波的KdV-mKdV方程，结合改进的Morison公式，采用有限单元法在时域内对内孤立波作用下顶张力立管的极值响应进行了数值模拟，并就内波振幅、立管内流、顶张力、弹性模量和壁厚的变化对极值响应的影响进行了探讨。结果表明，内孤立波会引起立管较大的极值响应，在立管的分析计算中应该加以考虑。
Abstract
The internal solitary wave, which brings in strong shear current and powerful impact, can pose a hazard to ocean engineering structures like offshore platforms and marine risers. However, there are few studies about the responses of marine risers under internal solitary wave. An investigation on the extreme response of top tensioned riser under internal solitary wave is presented in this paper. To describe the flow field induced by internal solitary wave, the KdV-mKdV equation was employed. The modified Morison formula was chosen to calculate the hydrodynamic force, and the Finite Element Method was adopted to estimate the extreme response of top tensioned riser under internal solitary wave in time domain. The influences of the internal wave amplitude, internal flow, top tension, elastic modulus and wall thickness on the riser extreme response were discussed. The results show that internal solitary wave may induce quite large displacement and stress in riser, and the load of internal solitary wave should be concerned in riser analysis.
关键词
内孤立波 /
KdV-mKdV方程 /
顶张力立管 /
极值响应
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Key words
internal solitary wave /
KdV-mKdV equation /
top tensioned riser /
extreme response
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张莉 郭海燕 李效民.
南海内孤立波作用下顶张力立管极值响应研究[J]. 振动与冲击, 2013, 32(10): 100-104
ZHANG Li;GUO Hai-yan;LI Xiao-min.
Extreme response study of top tensioned riser under internal solitary wave in the South China Sea[J]. Journal of Vibration and Shock, 2013, 32(10): 100-104
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