深海顶张式立管顺流涡激振动响应预报方法

摘要

针对深海顶端张紧式立管,基于刚性圆柱体顺流方向受迫振荡实验的水动力信息,采用有限元方法和能量平衡原理,建立了立管顺流涡激振动幅值响应的分析模型.该模型计及了立管横流方向涡激振动对顺流升力放大效应,根据激发力来源不同,分无量纲频率响应区间计算幅值并进行加权模态叠加.预报结果与Chaplin阶梯状来流涡激振动实验测量数据对比,吻合程度较好.%An in-line VIV analysis model of top tensioned riser was created based on the finite element method and the principle of energy conservation,by using hydrodynamic parameters derived from forced vibration experiments.Considering the influence of cross-flow vibration and the different sources of in-line lift force,response amplitudes were calculated in different frequency interval and then superposed.Compared with measured results from experiments of Chaplin,the forecast gives satisfactory results.