BREATHING VIBRATIONS OF A HORIZONTAL CIRCULAR CYLINDRICAL TANK SHELL,PARTIALLY FILLED WITH LIQUID

A theoretical approach to study breathing vibrations of cylindrical sh ells with horizontal axis, partially filled with liquid, is delineated and the results of some modal tests conducted on an industrially-manu factured tank are presented and discussed. The good agreement between theoretical and experimental results is preliminarily verified in the case of both an empty and completely fill shell, in order to confirm t hat it is possible to apply the theoretical approach to real structure s. The modal properties of a partially-filled shell as a function of l iquid level are then experimentally studied, the mode shapes are compa red using the Modal Assurance Criterium and a qualitative explanation of the dynamic behavior is proposed.