Nonlinear Dynamics Response of Casing Pipe Under Combined Wave-Current
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摘要: 考虑流及波流联合作用，研究了深水套管的涡激非线性振动．将套管简化为梁模型，计及Morison非线性流体动力和涡激荷载，建立套管的涡激振动方程．采用Korolov函数求解套管的固有频率和模态，提出了计算涡激非线性动力响应的Galerkin方法，计算了160 m水深中170 m长套管的固有频率和模态，研究了流引起的主共振和波流联合引起的组合共振．计算结果表明波流联合作用下套管的动力响应明显增大，结果也揭示了波流联合激励下套管复杂的动力响应特性．Abstract: The vortex-induced nonlinear vibration of casing pipes in the deep water was studied considering the loads of current and combined wave-current. The vortex-induced vibration equation of a casing pipe was set up considering the beam mode and Morison's nonlinear fluid loads as well as the vortex-excited loads. The approach of calculating vortex-excited nonlinear vibration by Galerkin's method was proposed. The natural vibration frequencies and modes were obtained, and the response including primary resonance induced by current and the composite resonance under combined wave-current for the 170 m long casing pipe in the 160 m depth of water were investigated. The results show that the dynamics response of casing pipe obviously increases, and the complicated response behaviors of casing pipe are described under combined wave-current.
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