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PHASE ANGLE IN TRANSIENT REGIMES OF VORTEX-INDUCED VIBRATION: AN EXPERIMENTAL DETERMINATION

机译:涡激振动瞬态中的相角:实验确定

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This article deals with an experimental determination of the relative phase angle between the shedding of vortices and motion in the case of the Aeolian vibrations of a flexible circular tube. The objective is to compare and determine if the phase value of a transient regime differs from that measured in a steady vibrating state. For each mode of vortex shedding (Von Kdrmdn, 2S and 2P), the results show that the value of the phase angle in the unsteady and steady regimes is relatively similar if an appropriate dependency is selected: in the cases of the 2P and 2S modes of vortex shedding, this dependency is either the dimensionless amplitude or the ratio of the velocity of the structure motion to the oncoming flow velocity; in the case of the Von Kdrmdn regime, at the onset of the instability, the usual reduced velocity is a better dependent variable. The analysis of jumps occurring in the instruments output reveals a boundary between the Von Kdrmdn and the 2P modes of vortex shedding.
机译:本文讨论了在挠性圆形管的风振作用下,旋涡脱落与运动之间的相对相位角的实验确定。目的是比较和确定瞬态状态的相位值是否不同于在稳定振动状态下测得的相位值。对于每种涡旋脱落模式(Von Kdrmdn,2S和2P),结果表明,如果选择了适当的依存关系,则在不稳定和稳定状态下的相角值会相对相似:在2P和2S模式下对于涡旋脱落,这种依赖性是无量纲的振幅,或者是结构运动速度与迎面而来的流速之比;在冯·克德姆(Von Kdrmdn)政权的情况下,在不稳定开始时,通常降低的速度是较好的因变量。对仪器输出中发生的跳变的分析揭示了Von Kdrmdn与涡旋脱落的2P模式之间的边界。

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