Bistable phenomenon of vortex-induced vibration of deep-water riser

被引：0

作者：

Li J.-T. ^{[1
,2
]}

Wu Z.-Q. ^{[1
,2
]}

Wang Y.-C. ^{[1
,2
]}

Zhang X.-Y. ^{[1
,2
]}

机构：

[1] School of Mechanical Engineering, Tianjin University, Tianjin

[2] Tianjin Key Laboratory of Nonlinear Dynamics and Chaos Control, Tianjin University, Tianjin

来源：

Chuan Bo Li Xue/Journal of Ship Mechanics | 2019年 / 23卷 / 10期

关键词：

Frequency variation; Multistable; Phase variation; Vortex-induced vibration; Wake oscillator;

D O I：

10.3969/j.issn.1007-7294.2019.10.003

中图分类号：

学科分类号：

摘要：

In order to study the vortex-induced vibration of deep-sea riser, the square nonlinearity of fluid damping and the inertial coupling of the structure are considered in the fluid-solid nonlinear coupling dynamic model. Based on the first order Galerkin modal discrete equation, the influence of flow velocity on the stability of the system is analyzed by eigenvalue calculation. The influence of flow velocity on the response nonlinear feature (frequency and amplitude) is analyzed by Poincaré mapping method. The results show that coupled flutter region can be used to estimate the range of frequency-locked region of vortex induced vibration; On both sides of the frequency-locked region, there are two types of bistable phenomena: the coexistence of quasi-periodic motion and locking movement on the left side, the coexistence of small amplitude periodic motion and locking movement on the right side. There are structural modal and vortex modes simultaneously under small flow velocity, and the response is expressed as structural modal. At large flow velocity, the response only contains vortex induced modal. © 2019, Editorial Board of Journal of Ship Mechanics. All right reserved.

引用

页码：1168 / 1176

页数：8

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