The Lamb waves phase velocity dispersion evaluation using an hybrid measurement technique
| Autor: | Olgirdas Tumšys, Lina Draudviliene, H. Ait Aider, L. Mazeika |
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| Přispěvatelé: | „Elsevier Science' grupė |
| Rok vydání: | 2018 |
| Předmět: |
Lamb waves
Materials science Wave propagation Acoustics Bandwidth (signal processing) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Finite element method composite plate phase velocity Dispersion relation 0103 physical sciences Group delay dispersion Ceramics and Composites Group velocity dispersion Phase velocity 0210 nano-technology 010301 acoustics Civil and Structural Engineering |
| Zdroj: | Composite Structures. 184:1156-1164 |
| ISSN: | 0263-8223 |
| Popis: | In this paper two techniques: the zero-crossing and the spectrum decomposition are implemented together to obtain the guided waves phase velocity and their dispersion properties. This proposed hybrid technique has been investigated in two different mediums: an homogenous using signals obtain by 2D finite element modeling and experimental investigation and a non-homogenous environment using 3D finite element model. The results are compared with those obtained by the semi-analytical finite element method (SAFE). It was demonstrated that in the case of correctly selected filters the dispersion curves are reconstructed in approximately 90% for the Lamb wave A0 mode, for the non – dispersive S0 mode up to 81% of the incident signal frequency bandwidth in a homogeneous medium. In the case of non-homogenous CFRP plate the phase velocity dispersion curve of the A0 mode can be reconstructed even up to 96% incident frequency bandwidth. |
| Databáze: | OpenAIRE |
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