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The effect of nonlinear multi-contact coupling with gap between risers and guide frames on global spar motion analysis

机译：立管与导向架之间存在间隙的非线性多触点耦合对整体翼梁运动分析的影响

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Nonlinear multi-contact coupling between vertical risers and guide frames inside the spar moon-pool is studied. The existing numerical model for hull/mooring/riser coupled dynamics analysis treats riser as an elastic rod truncated at the keel (truncated riser model), and the risers are free to slide in vertical direction with constant tension, while restricted in horizontal direction. The truncated riser model neglects the portion of the riser inside the moon-pool and tends to overestimate the spar pitch motion. In the newly developed model, the risers are extended through the moon-pool with realistic boundary conditions at multiple guide frames, and thus additional contact forces and moments on the spar hull are considered. The gap effects between the riser buoyancy-cans and riser guide frames are also modeled using three different types of gap springs. Their different dynamic characteristics are extensively studied. The new riser model also considers the Coulomb damping between buoyancy-cans and riser guide frames and also allows the impact-like contact force calculation on risers for ensuring fatigue analysis.
机译：研究了竖板月池内部垂直立管与导向框架之间的非线性多触点耦合。现有的用于船体/系泊/立管耦合动力学分析的数值模型将立管视为在龙骨处被截断的弹性杆（截短立管模型），并且立管可以在恒定张力下沿竖直方向自由滑动，而在水平方向上受到限制。截断的立管模型忽略了月池内部的立管部分，并倾向于高估了翼梁的俯仰运动。在新开发的模型中，立管在多个引导架上以实际边界条件延伸穿过月池，因此考虑了在翼梁船体上的附加接触力和力矩。还使用三种不同类型的间隙弹簧对立管浮力罐和立管导向框架之间的间隙效应进行建模。对它们不同的动态特性进行了广泛的研究。新的立管模型还考虑了浮力罐和立管导向框架之间的库仑阻尼，并且还允许计算立管上的冲击式接触力，以确保疲劳分析。

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