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首页> 外文期刊>International journal of structural stability and dynamics >Nonlinear Dynamics of a Fluid-Structure Coupling Model for Vortex-Induced Vibration
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Nonlinear Dynamics of a Fluid-Structure Coupling Model for Vortex-Induced Vibration

机译：涡流诱导振动流体结构耦合模型的非线性动力学

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摘要

This paper presents a fluid-structure coupling model to investigate the vortex-induced vibration of a circular cylinder subjected to a uniform cross-flow. A modified van der Pol nonlinear equation is employed to represent the fluctuating nature of vortex shedding. The wake oscillator is coupled with the motion equation of the cylinder by applying coupling terms in modeling the fluid-structure interaction. The transient responses of the fluid-structure coupled model are presented and discussed by numerical simulations. The results demonstrate the main features of the vortex-induced vibration, such as lock-in phenomenon, i.e. resonant oscillation of the cylinder occurs when the vortex shedding frequency is near to the natural frequency of the cylinder. The resonant responses of the fluid-structure coupled model in the lock-in region are determined by the multiple scales method. The accuracy of the asymptotic solution by the multiple scales method is verified by comparing with the numerical solution from the motion equation. The effects of different parameters on the steady state amplitude of oscillation are investigated for a given set of parameters. Frequency-response curves obtained from the modulation equation demonstrate the existence of jump phenomena.
机译：本文介绍了流体 - 结构耦合模型，以研究经受均匀的横流的圆柱的涡旋诱导的振动。使用改进的范德波极性方程来表示涡旋脱落的波动性。唤醒振荡器通过在模拟流体结构相互作用时施加耦合术语与气缸的运动方程联接。通过数值模拟呈现和讨论了流体结构耦合模型的瞬态响应。结果证明了涡旋诱导的振动的主要特征，例如锁定现象，即圆柱体的共振振荡发生，当涡流脱落频率接近气缸的固有频率时发生。锁定区域中的流体结构耦合模型的谐振响应由多个尺度方法确定。通过与来自运动方程的数值解相比，通过多尺度方法进行渐近溶液的精度。针对给定的一组参数，研究了不同参数对稳态振荡振荡的影响。从调制方程获得的频率响应曲线展示了跳跃现象的存在。

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