Abstract
Egg-shaped sludge digester tank model with the scale of 1/30 was made of acryloid plastic. Horizontal and rocking vibration tests of the tank model were carried out on the shaking table with rather high frequency (10-25Hz) and the impulsive water pressures on the tank wall in various water depth were measured. Theoretical solutions to analyze the impulsive water pressure in an axisymmetric rigid tank were deduced by using the transfer matrix method. It was proved that the theoretical values agreed well with the measured ones obtained from the model tests. The calculating diagrams were drawn to be able to obtain easily the equivalent mass of water in tank, its center of action and the equivalent moment of inertia of water.
