Vortex-Induced Vibrations of Two Degrees-of-Freedom Sprung Cylinder With a Rotational Nonlinear Energy Sink: A Numerical Investigation
Vortex-Induced Vibrations of Two Degrees-of-Freedom Sprung Cylinder With a Rotational Nonlinear Energy Sink: A Numerical Investigation
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DOI：
10.1115/1.4051023
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发表时间：
2021-04
影响因子：
2
通讯作者：
Dongyang Chen;C. Gu;Ruihua Zhang;Liu Jiaying;Dian Guo;P. Marzocca
中科院分区：
文献类型：
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作者：
Dongyang Chen;C. Gu;Ruihua Zhang;Liu Jiaying;Dian Guo;P. Marzocca
涡激振动是风工程和海洋工程领域中常见的流固耦合现象。大振幅涡激振动对流体中的细长结构有显著的影响，有时甚至是破坏性的。为了研究如何控制涡激振动，本文研究了刚性柱体与旋转非线性能量汇（R-NES）的动力学行为。这是使用两个自由度（2DOF）的货车德尔波尔唤醒振荡器模型，适用于考虑在横流和流向方向的耦合振动。将R-内斯的控制方程与尾流振子模型耦合，建立了流-柱-内斯耦合系统。研究了不同质量比的圆柱在R-NES作用下的动力学特性，发现R-NES对高质量比圆柱涡激振动的抑制效果优于低质量比圆柱。本文还系统地研究了R-NES的不同参数对涡激振动响应的影响。结果表明，增大质量参数β和转动半径r ω可以改善结构的性能，而阻尼参数r ω的影响较为复杂，且与结构的质量比有关。
Vortex-induced vibration (VIV) is a common fluid–structure interaction phenomenon in the field of wind engineering and marine engineering. The large-amplitude VIV has a marked impact on the slender structure in fluids, at times even destructive. To study how the VIV can be controlled, the dynamics of a rigid cylinder attached to a rotational nonlinear energy sink (R-NES) is investigated in this paper. This is done using a two degrees-of-freedom (2DOF) Van der Pol wake oscillator model adapted to consider a coupled vibration in cross-flow and streamwise directions. The governing equation of R-NES is coupled to the wake oscillator model; hence, a flow-cylinder–NES coupled system is established. While exploring the dynamics of the cylinders with different mass ratios under the action of R-NES, it was found that the R-NES delivers better performance in suppressing the VIV of a cylinder with high mass ratios than that of a low mass ratios cylinder. The effect of the distinct parameters of R-NES on VIV response was also systematically investigated in this study. The results indicate that higher mass parameter β and rotation radius r̂ can lead to improved performance, while the effect of the damping parameter ξ is complex and appears to be linked to the mass ratio of the column structure.