Application of the phase gradient method to the study of the resonances of a water-loaded anisotropic plate

Abstract

The phase gradient method is applied to cubic and orthotropic plates. It consists in simply obtaining the positions and the widths of their frequency and angular resonances from the plots of the frequency and angular derivatives of the phase of the reflection coefficient of the immersed plate. There is a good match with the results obtained from the calculation of the modes of the immersed plate in the corresponding complex planes. Moreover, these two derivatives allow us to obtain frequency and angular quality factors.