Predictive SEA and anisotropic panels

The overall aim of the work was to extend predictive SEA into the realm of laminates, sandwich panels and curvature. The basic premise is that, in principle, any homogeneous plate can be incorporated into predictive SEA theory with full mathematical rigour. The equations of motion are derived for anisotropic curved sandwich panels. These result in three transition frequencies - frequencies at which an evanescent wave transforms into a traveling wave. Formulae are also derived for unbiased SEA parameters, which are based on assuming equipartition of modal energy. Good agreement is shown between test measurements and predictions.