Abstract
Experimental studies have been carried out on the nonlinear hydroelastic vibrations of a circular cylindrical container with an elastic bottom plate, but otherwise rigid, and partially filled with water. The nonlinearities of the responses of the liquid and the bottom plate were investigated for various liquid heights. The influence of the flexibility of the bottom on the linear natural frequencies of the sloshing response was investigated, as well as the influence of the liquid on the linear natural frequencies of the bulging-type response, using the test tank with a flexible bottom plate of two kinds of polyester sheet: 0·25 mm and 0·35 mm thick. The characteristics of dynamic coupling between bottom plate motion and liquid motion change with liquid height; e.g., the maximum amplitude of the free surface, when the bottom plate is harmonically vibrating, varies with liquid height, and the maximum amplitude of the bottom plate, when the edge of the bottom is excited with constant amplitude, also depends on the liquid height. Furthermore, a free surface wave generated by the vibrating bottom plate is due to a parametric response in the case of low liquid height, while in a moderately higher liquid height, it is a forced response to the vibration.
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