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EDGE-REFLECTION ANALYSIS OF GUIDED WAVES IN A 3-D PLATE

This study carries out the edge-reflection analysis of guided waves in a 3-D plate. First, we excite an incident guided wave by applying a normal traction on the surface of a 3-D plate. The excited wave field is obtained in the frequency and wavenumber domains. Secondly, we perform the edge-reflection analysis in the frequency and wavenumber domains by applying the mode-decomposition method to obtain the reflection coefficients as functions of the frequency and the wavenumber. Thirdly, the reflected waves are calculated in the frequency and wavenumber domains by using the reflection coefficients obtained in the second step. Lastly, we obtain the reflected waves in a 3-D plate by performing inverse Fourier transforms. The reflection coefficients in a 3-D plate are evaluated as the amplitude ratio between the reflected wave and the incident wave. We discuss the difference between the coefficients in 3-D and 2-D problems in detail by changing some parameters such as the size of the exciter and the distance between the exciter and the edge.