Purpose

This study elucidated the effect of an inclined spring arrangement on the flow-induced vibration of a circular cylinder to understand if the effect enhances the harnessing of the energy of fluid flows.

Method

An experiment was conducted on a circulating water channel. A circular cylinder was partially submerged. It was elastically supported by two springs whose longitudinal directions were varied. With the speed of the water flow varied, the vibrations of the circular cylinder were measured. The measured vibrations were interpreted by la linear dynamic model.

Results and discussion

In a few cases, a jump in response amplitudes from zero to the maximum was observed with the spring inclination at reduced velocities of 6 to 7, whereas gradually increasing response amplitudes were observed in other cases. The inclined spring arrangement achieved greater velocity amplitudes than in cases without spring inclination. A theoretical evaluation of the measured responses indicates that the effect of the inclined springs was caused by geometric nonlinearity; the effect would be more prominent by employing a longer moment lever.

中文翻译：

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弹簧布置对圆柱体流致振动的影响

目的

这项研究阐明了倾斜弹簧装置对圆柱体流动引起的振动的影响，以了解该影响是否增强了对流体流动能量的利用。

方法

在循环水通道上进行了实验。圆柱体被部分浸没。它由纵向变化的两个弹簧弹性支撑。随着水流速度的变化，测量了圆柱的振动。通过线性动力学模型解释了测得的振动。

结果与讨论

在少数情况下，在弹簧倾斜度降低的速度为6到7的情况下，观察到响应幅度从零跳到最大值，而在其他情况下观察到响应幅度逐渐增加。与没有弹簧倾斜的情况相比，倾斜的弹簧装置获得了更大的速度幅度。对测得的响应的理论评估表明，倾斜弹簧的影响是由几何非线性引起的。如果使用更长的力矩杆，效果会更加突出。