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Numerical computation of VIV induced fatigue damage for deepwater riser using pseudo-excitation method
Author(s): 
Pages: 787-796
Year: Issue:  7
Journal: Journal of Ship Mechanics

Keyword:  深海立管涡激振动疲劳损伤随机振动虚拟激励法;
Abstract: 针对深海立管长细比非常大的结构特性,使用索模型单元计算结构的非线性刚度阵,并验证了模型的有效性;在立管离散点处的平面上考虑结构与流体的耦合作用,采用离散涡方法计算了立管二维模型在均匀海流下的涡激升力载荷,为随机振动分析提供载荷谱,用于构造虚拟激励.最终将立管的涡激振动看作平稳随机过程,采用随机振动理论中的虚拟激励法求解立管在涡激力激励下的响应.基于P-M准则,对响应进行计算得到立管的年损伤率,实现了深海立管的疲劳损伤预报.
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