Spring-Arrangement Effect on Flow-Induced Vibration of a Circular Cylinder
Spring-Arrangement Effect on Flow-Induced Vibration of a Circular Cylinder
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DOI：
10.1007/s42417-020-00268-5
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发表时间：
2021-01
影响因子：
2.7
通讯作者：
Koki Yamada;Yuga Shigeyoshi;Shuang-qiao Chen;Y. Nishi
中科院分区：
文献类型：
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作者：
Koki Yamada;Yuga Shigeyoshi;Shuang-qiao Chen;Y. Nishi
目的研究倾斜弹簧布置对圆柱流激振动的影响，以了解倾斜弹簧布置是否能增强对流体流动能量的利用。方法在循环水通道上进行实验。一个圆柱体部分被淹没。它由两根纵向变化的弹簧弹性地支撑着。随着水流速度的变化，测量了圆柱体的振动。实测振动用线性动力学模型解释。结果和讨论在少数情况下，在速度降低6到7的情况下，弹簧倾角从零到最大值，而在其他情况下，则观察到响应幅度逐渐增加。与没有弹簧倾斜的情况相比，倾斜弹簧布置获得了更大的速度幅值。对实测响应的理论分析表明，倾斜弹簧的影响是由几何非线性引起的；如果采用更长的力矩杠杆，效果会更突出。
PurposeThis 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.MethodAn 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 discussionIn 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.