Experimental Studies on a Nonlinear Hydroelastic Vibration of CircularCylindrical Tanks

摘要

Experimental studies were carried out on the nonlinear hydroelastic vibrations ofa circular cylindrical tank system. A rigid wall tank with a flexible bottom, and a flexible wall tank with a rigid bottom were studied. In both cases, the tank was fully or partially filled with liquid having a free surface. The nonlinearity of the responses of contained liquid and bottom plate or flexible wall was investigated. The influence of the flexible bottom or flexible wall on the natural frequencies of the sloshing response in which liquid motions are predominant, as well as the influence of the contained liquid on the natural frequencies of the bulging response in which the motions of a bottom plate or flexible wall is predominant, were also clarified. Polyester foils with thickness 0.25 mm and 0.35 mm were used as a bottom plate and a flexible wall of the test tank, and water was used as a contained liquid.