IDENTIFICATION OF FLUID ELASTIC VIBRATION OF MULTIPLE CYLINDRICAL

在这项研究中，我们对多根柔性圆柱线耦合环形晃动的自激振动进行了稳定性分析，并成功地推导出了不稳定振动的建模理论和对抗措施的设计方法。所要分析的系统是用于冷却快堆的冷却剂的壁面和环形通道的组合。基于我们已经推导出的理论。发展了一种适用于双挠性圆柱壳的理论。通过实验验证了该理论的正确性。在实验中，我们第一次观察到两个柔性圆柱壳的不稳定振动是相互异相振动的。我们对失稳进行了计算，得到了所谓的失稳图，它直接导致了避免失稳的对策设计准则。

In this study, we performed stability analyses of self-excited vibration of multiple flexible cylindrical wires coupled with annular sloshing and succeeded in deriving the theory for modeling the unstable vibration and design methodology for countermeasures. The system to be analyzed is the combination of walls and annular passage for coolant used for cooling Fast Breeder Reactor. Based on the theory we already derived. We developed a theory applicable to the case composed of dual flexible cylindrical shells. The validity of this theory was verified by experiments. In the experiments, we observed unstable vibrations in the ease of dual flexible cylindrical shells vibrating out of phase each other for the first time. We performed calculation for the instability and obtained so-called instability map which directly leads to design criteria for countermeasures to avoid the instability.