A model to predict modal radiation by finite-sized sources in composite plates with account of caustics

Mathilde Stévenin (1, 2, 3) , Alain Lhémery (1) , Sébastien Grondel (2, 3)

1 DISC - Département Imagerie et Simulation pour le Contrôle
2 IEMN-DOAE - Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520
3 MAMINA - IEMN - Matériaux et Acoustiques pour MIcro et NAno systèmes intégrés - IEMN

The guided wave field generated by finite size transducers in a composite plate is studied. For isotropic plates, Fraunhofer-like approximations can be found in the literature. Similar approximations fail when the plate is anisotropic. A new calculation method is proposed. Based on a modal decomposition, its principle is to integrate over the transducer surface as seen in energy directions from the calculation point. Special care is taken when dealing with energy paths in direction of caustics. To validate this method, some comparisons are made between our results and those obtained using a full integration over the surface of the source.

Keywords: Anisotropy; Guided electromagnetic wave propagation; Models; Transducers; Anisotropic plates; caustic; Composite plates; Energy paths; finite-sized source; Isotropic plates; Modal decomposition; Transducer surface; Intensive care units

Domains: Computer Science [cs]; Computer Aided Engineering

Mathilde Stévenin, Alain Lhémery, Sébastien Grondel. A model to predict modal radiation by finite-sized sources in composite plates with account of caustics. Physics Procedia, 2015, 70, pp.622-625. ⟨10.1016/j.phpro.2015.08.042⟩. ⟨cea-01753218⟩