Abstract

Guided waves are widely used as a non-destructive technique for the detection of defects or damage in structures due to the their excellent propagation characteristics. Developing an efficient calculation of guided waves is crucial in this context. In this work we present an approach named semi-analytical isogeometric analysis (SAIGA) for computation of dispersion properties of fluid-coupled waveguides in three-dimensional structures. The proposed approach is based on the use of Non-Uniform Rational B-splines (NURBS) as the basis functions for the geometry representation and for solution's approximation. It is shown that the using NURBS basis functions has significant advantage over using Lagrange basis functions for computing the dispersion of leaky waves in immersed waveguides due to their higher smoothness feature.