1 April 2016 Simulation of guided wave propagation near numerical Brillouin zones
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Abstract
Attractive properties of guided waves provides very unique potential for characterization of incipient damage, particularly in plate-like structures. Among other properties, guided waves can propagate over long distances and can be used to monitor hidden structural features and components. On the other hand, guided propagation brings substantial challenges for data analysis. Signal processing techniques are frequently supported by numerical simulations in order to facilitate problem solution. When employing numerical models additional sources of errors are introduced. These can play significant role for design and development of a wave-based monitoring strategy. Hence, the paper presents an investigation of numerical models for guided waves generation, propagation and sensing. Numerical dispersion analysis, for guided waves in plates, based on the LISA approach is presented and discussed in the paper. Both dispersion and modal amplitudes characteristics are analysed. It is shown that wave propagation in a numerical model resembles propagation in a periodic medium. Consequently, Lamb wave propagation close to numerical Brillouin zone is investigated and characterized.
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Piotr Kijanka, Piotr Kijanka, Wieslaw J. Staszewski, Wieslaw J. Staszewski, Pawel Packo, Pawel Packo, "Simulation of guided wave propagation near numerical Brillouin zones", Proc. SPIE 9805, Health Monitoring of Structural and Biological Systems 2016, 98050Q (1 April 2016); doi: 10.1117/12.2218880; https://doi.org/10.1117/12.2218880
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