Traveling unstable sloshing modes have been observed in experiments on the fluidstructure coupled system in a thin cylindrical weir. The unstable vibration was found to be classified into three types: i.e., traveling wave which travels along one circumference direction; traveling wave which travels in the clockwise and counterclockwise directions alternately; and stationary wave. Influences of the outer and the inner annular gap widths, the height of weir, the elastic rigidity of weir, and baffle plate on the characteristics of the unstable sloshing vibration were clarified.

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