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首页> 外文期刊>Journal of Fluid Science and Technology >Vortex-induced vibration of two elastically connected bodies: experimental verification of lock-in to multiple eigenmodes
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Vortex-induced vibration of two elastically connected bodies: experimental verification of lock-in to multiple eigenmodes

机译：两个弹性连接体的涡激振动：对多种本征模式的锁定实验验证

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This study examines experimentally the vortex-induced vibration (VIV) of a mechanical system with two eigenmodes. A previous experiment setup was refined to enable the experiment, and was placed in a circulating water channel to submerge a movable circular cylinder (cylinder A). This cylinder was subjected to fluid flow while being supported elastically, whereupon VIV occurred. A second movable cylinder (cylinder B) above the water was connected to cylinder A and supported elastically. The displacements of those two cylinders were measured. The underlying hypothesis was that the vortex shedding frequency would become locked to one or other of the two eigenfrequencies, and that which eigenmode the vortex shedding frequency became locked to would depend on the reduced velocity. To test this hypothesis, the experimental setup was refined to withstand the high flow speeds required to allow the vortex shedding frequency to become locked to either eigenfrequency. From the results obtained, the amplitude ratio (the ratio of the amplitude of cylinder B to that of cylinder A) and the frequencies of the two cylinders were determined. It was found that those amplitude ratio and frequencies were close in two ranges of reduced velocity to those calculated theoretically by solving the eigenvalue problem of the 2DOF system. This demonstrated that, depending on the reduced velocity, the vortex shedding frequency could become locked to either the first or second eigenmode to produce a definite vortex-induced vibration.
机译：这项研究实验检查了具有两个本征模式的机械系统的涡激振动（VIV）。完善了先前的实验设置以进行实验，并将其放置在循环水通道中以浸没可移动的圆柱体（圆柱体A）。对该圆筒进行弹性支撑的同时进行流体流动，从而产生VIV。水上方的第二可移动缸（缸B）连接到缸A并受到弹性支撑。测量了这两个气缸的排量。基本假设是，涡旋脱落频率将被锁定为两个本征频率中的一个或另一个，而涡旋脱落频率被锁定为哪个本征模式将取决于速度的降低。为了检验这一假设，对实验装置进行了改进，使其能够承受使涡旋脱落频率锁定为任一本征频率所需的高流速。根据获得的结果，确定振幅比（气缸B的振幅与气缸A的振幅之比）和两个气缸的频率。发现通过解决2DOF系统的特征值问题，这些振幅比和频率在两个减小的速度范围内接近于理论计算的速度范围。这表明，取决于降低的速度，涡旋脱落频率可能会锁定到第一或第二本征模，从而产生确定的涡旋诱发的振动。

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