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涡激振动预报对于深水环境中的细长海洋结构物的设计至关重要。近年来出现的若干经验模型基于圆柱体受迫振荡实验数据。文中介绍了细长海洋结构物涡激振动预报工具的发展,进而提出了一种基于圆柱体受迫振荡实验数据的预报模型。与现有的类似模型相比较,该模型更加直接地利用了原始模型实验数据,并且将立管的有限元模态分析并入到响应预报当中,以计及立管物理参数的不均匀特性。利用近期立管模型在阶梯状分布流以及剪切流中的涡激振动响应实验测量数据,验证了该模型的有效性。该模型的计算结果表明,立管的模态振型、模态频率与涡激振动响应高度耦合,并且对于低质量比的情况尤为明显。文中还指出了类似的基于受迫振荡圆柱体实验数据的预报模型存在的缺陷。
Vortex-induced vibration prediction is crucial for the design of slender marine structures in deep-water environments. Several empirical models that have emerged in recent years are based on experimental data on forced oscillations of cylinders. In this paper, the development of vortex-induced vibration prediction tools for slender marine structures is introduced, and then a prediction model based on experimental data of cylindrical forced oscillation is proposed. Compared with the existing similar models, the model makes direct use of the experimental data of the original model and incorporates the finite element modal analysis of the riser into response prediction to take account of the non-uniform characteristics of the riser’s physical parameters. The effectiveness of this model is verified by the experimental data of the vortex-induced vibration response of the staged flow and the shear flow using the recent riser model. The results of this model show that the mode shapes and modal frequencies of the riser are highly coupled with the vortex-induced vibration responses, and this is especially true for low mass ratios. The paper also pointed out the similar defects existing in the forecasting model based on experimental data of forced oscillation cylinder.