Scattering of guided waves by flat-bottomed cavities with irregular shapes

► We study the scattering of guided waves by partly through-thickness, flat-bottomed cavities with irregular shapes in plates. ► We develop an analytical model and compare it to a finite element model. ► We present 2 examples: partly through-thickness cavities with elliptical and arbitrary shape. ► Results from the analytical and the finite element models show very good agreement.