FREE-EDGE CIRCULAR PLATES VIBRATING IN WATER

The problem of vibration of circular plates immersed in water has been studied by specialists for many years, but it is not completely solve d. In this paper the expectations of the theories developed for free-e dge plates are compared with experimental data obtained using advanced techniques. Results on natural frequencies, mode shapes and damping r atios are presented. Small, but substantial differences between theori es and experiments were found in the natural frequencies due to intera ction with water. Differences between corresponding mode shapes in air and in water were also detected, contrary to current theoretical assu mption. Experimentally-evaluated, non-dimensional added virtual mass i ncremental factors are given for very accurate applications and furthe r theoretical development.