The modal parameters of sloshing fluid are essential for the design of liquid tanks and vibration control. In the modal experiment of fluid sloshing，the modal motions of free liquid surface should be aroused. However the symmetric-mode motions of free surface are difficultly stimulated, therefore the modal parameters (especially for the damping ratios) of the symmetric modes cannot be accurately measured. This paper applied parametric vibration method to excite the two-dimensional (parametric) sloshing in the rectangular, U-shaped and circular tanks. The first four mode motions (including the symmetric-mode motions) of free surface are easily aroused. After stopping the external excitation, a free damped vibration response of a certain mode on the free liquid surface can be obtained, and measured with the laser displacement sensor. The sloshing natural frequencies and the corresponding damping ratios are precisely obtained. The experimental and theoretical frequency results agree well, which verified the validation of present experimental method.
Key words
two-dimensional sloshing /
parametric vibration /
experiment /
liquid /
modal parameter
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