着雪・着氷した円柱状構造物に発現するクロスフロー流力振動特性

抄録

In this study，the flow-induced vibration phenomena on a cylindrical structure at snow and ice accumulation were investigated．Specifically，a cylindrical structure with snow and ice on it was modeled and three models of different sizes were examined．The free vibration experiments were conducted in a wind tunnel to investigate the fluid dynamic response characteristics of cross-flow flow-induced vibration．The relationship between the reduced mass-damping parameter and the maximum displacement was also investigated in the experiments．In addition，the flow patterns during stationary and oscillatory conditions were investigated by conducting a water channel visualization experiment．As a result，the maximum displacement of the flow-induced vibration in the snow and ice accretion model were found to be much larger than that of a circular cylinder．The relationship between the size of the snow/ice accretion and the maximum displacement of the flow-induced vibration and the reduced mass-damping parameter were clarified．Furthermore，the relationship between the vortex formed around the object and the vibration phase was clarified．